An SEV-ES guest does not allow register state to be altered once it has been measured. When an SEV-ES guest issues a reboot command, Qemu will reset the vCPU state and resume the guest. This will cause failures under SEV-ES. Prevent that from occuring by introducing an arch-specific callback that returns a boolean indicating whether vCPUs are resettable. Cc: Peter Maydell <peter.maydell@linaro.org> Cc: Aurelien Jarno <aurelien@aurel32.net> Cc: Jiaxun Yang <jiaxun.yang@flygoat.com> Cc: Aleksandar Rikalo <aleksandar.rikalo@syrmia.com> Cc: David Gibson <david@gibson.dropbear.id.au> Cc: David Hildenbrand <david@redhat.com> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com> Reviewed-by: Venu Busireddy <venu.busireddy@oracle.com> Message-Id: <1ac39c441b9a3e970e9556e1cc29d0a0814de6fd.1611682609.git.thomas.lendacky@amd.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
1053 lines
29 KiB
C
1053 lines
29 KiB
C
/*
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* ARM implementation of KVM hooks
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*
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* Copyright Christoffer Dall 2009-2010
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*
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*/
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#include "qemu/osdep.h"
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#include <sys/ioctl.h>
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#include <linux/kvm.h>
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#include "qemu-common.h"
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#include "qemu/timer.h"
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#include "qemu/error-report.h"
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#include "qemu/main-loop.h"
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#include "qom/object.h"
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#include "qapi/error.h"
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#include "sysemu/sysemu.h"
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#include "sysemu/kvm.h"
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#include "sysemu/kvm_int.h"
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#include "kvm_arm.h"
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#include "cpu.h"
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#include "trace.h"
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#include "internals.h"
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#include "hw/pci/pci.h"
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#include "exec/memattrs.h"
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#include "exec/address-spaces.h"
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#include "hw/boards.h"
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#include "hw/irq.h"
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#include "qemu/log.h"
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const KVMCapabilityInfo kvm_arch_required_capabilities[] = {
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KVM_CAP_LAST_INFO
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};
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static bool cap_has_mp_state;
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static bool cap_has_inject_serror_esr;
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static bool cap_has_inject_ext_dabt;
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static ARMHostCPUFeatures arm_host_cpu_features;
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int kvm_arm_vcpu_init(CPUState *cs)
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{
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ARMCPU *cpu = ARM_CPU(cs);
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struct kvm_vcpu_init init;
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init.target = cpu->kvm_target;
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memcpy(init.features, cpu->kvm_init_features, sizeof(init.features));
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return kvm_vcpu_ioctl(cs, KVM_ARM_VCPU_INIT, &init);
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}
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int kvm_arm_vcpu_finalize(CPUState *cs, int feature)
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{
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return kvm_vcpu_ioctl(cs, KVM_ARM_VCPU_FINALIZE, &feature);
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}
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void kvm_arm_init_serror_injection(CPUState *cs)
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{
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cap_has_inject_serror_esr = kvm_check_extension(cs->kvm_state,
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KVM_CAP_ARM_INJECT_SERROR_ESR);
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}
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bool kvm_arm_create_scratch_host_vcpu(const uint32_t *cpus_to_try,
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int *fdarray,
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struct kvm_vcpu_init *init)
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{
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int ret = 0, kvmfd = -1, vmfd = -1, cpufd = -1;
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kvmfd = qemu_open_old("/dev/kvm", O_RDWR);
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if (kvmfd < 0) {
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goto err;
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}
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vmfd = ioctl(kvmfd, KVM_CREATE_VM, 0);
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if (vmfd < 0) {
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goto err;
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}
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cpufd = ioctl(vmfd, KVM_CREATE_VCPU, 0);
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if (cpufd < 0) {
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goto err;
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}
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if (!init) {
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/* Caller doesn't want the VCPU to be initialized, so skip it */
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goto finish;
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}
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if (init->target == -1) {
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struct kvm_vcpu_init preferred;
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ret = ioctl(vmfd, KVM_ARM_PREFERRED_TARGET, &preferred);
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if (!ret) {
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init->target = preferred.target;
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}
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}
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if (ret >= 0) {
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ret = ioctl(cpufd, KVM_ARM_VCPU_INIT, init);
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if (ret < 0) {
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goto err;
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}
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} else if (cpus_to_try) {
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/* Old kernel which doesn't know about the
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* PREFERRED_TARGET ioctl: we know it will only support
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* creating one kind of guest CPU which is its preferred
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* CPU type.
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*/
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struct kvm_vcpu_init try;
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while (*cpus_to_try != QEMU_KVM_ARM_TARGET_NONE) {
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try.target = *cpus_to_try++;
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memcpy(try.features, init->features, sizeof(init->features));
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ret = ioctl(cpufd, KVM_ARM_VCPU_INIT, &try);
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if (ret >= 0) {
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break;
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}
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}
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if (ret < 0) {
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goto err;
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}
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init->target = try.target;
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} else {
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/* Treat a NULL cpus_to_try argument the same as an empty
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* list, which means we will fail the call since this must
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* be an old kernel which doesn't support PREFERRED_TARGET.
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*/
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goto err;
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}
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finish:
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fdarray[0] = kvmfd;
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fdarray[1] = vmfd;
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fdarray[2] = cpufd;
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return true;
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err:
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if (cpufd >= 0) {
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close(cpufd);
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}
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if (vmfd >= 0) {
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close(vmfd);
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}
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if (kvmfd >= 0) {
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close(kvmfd);
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}
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return false;
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}
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void kvm_arm_destroy_scratch_host_vcpu(int *fdarray)
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{
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int i;
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for (i = 2; i >= 0; i--) {
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close(fdarray[i]);
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}
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}
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void kvm_arm_set_cpu_features_from_host(ARMCPU *cpu)
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{
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CPUARMState *env = &cpu->env;
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if (!arm_host_cpu_features.dtb_compatible) {
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if (!kvm_enabled() ||
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!kvm_arm_get_host_cpu_features(&arm_host_cpu_features)) {
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/* We can't report this error yet, so flag that we need to
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* in arm_cpu_realizefn().
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*/
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cpu->kvm_target = QEMU_KVM_ARM_TARGET_NONE;
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cpu->host_cpu_probe_failed = true;
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return;
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}
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}
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cpu->kvm_target = arm_host_cpu_features.target;
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cpu->dtb_compatible = arm_host_cpu_features.dtb_compatible;
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cpu->isar = arm_host_cpu_features.isar;
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env->features = arm_host_cpu_features.features;
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}
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static bool kvm_no_adjvtime_get(Object *obj, Error **errp)
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{
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return !ARM_CPU(obj)->kvm_adjvtime;
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}
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static void kvm_no_adjvtime_set(Object *obj, bool value, Error **errp)
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{
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ARM_CPU(obj)->kvm_adjvtime = !value;
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}
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static bool kvm_steal_time_get(Object *obj, Error **errp)
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{
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return ARM_CPU(obj)->kvm_steal_time != ON_OFF_AUTO_OFF;
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}
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static void kvm_steal_time_set(Object *obj, bool value, Error **errp)
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{
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ARM_CPU(obj)->kvm_steal_time = value ? ON_OFF_AUTO_ON : ON_OFF_AUTO_OFF;
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}
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/* KVM VCPU properties should be prefixed with "kvm-". */
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void kvm_arm_add_vcpu_properties(Object *obj)
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{
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ARMCPU *cpu = ARM_CPU(obj);
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CPUARMState *env = &cpu->env;
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if (arm_feature(env, ARM_FEATURE_GENERIC_TIMER)) {
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cpu->kvm_adjvtime = true;
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object_property_add_bool(obj, "kvm-no-adjvtime", kvm_no_adjvtime_get,
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kvm_no_adjvtime_set);
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object_property_set_description(obj, "kvm-no-adjvtime",
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"Set on to disable the adjustment of "
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"the virtual counter. VM stopped time "
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"will be counted.");
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}
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cpu->kvm_steal_time = ON_OFF_AUTO_AUTO;
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object_property_add_bool(obj, "kvm-steal-time", kvm_steal_time_get,
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kvm_steal_time_set);
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object_property_set_description(obj, "kvm-steal-time",
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"Set off to disable KVM steal time.");
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}
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bool kvm_arm_pmu_supported(void)
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{
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return kvm_check_extension(kvm_state, KVM_CAP_ARM_PMU_V3);
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}
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int kvm_arm_get_max_vm_ipa_size(MachineState *ms)
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{
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KVMState *s = KVM_STATE(ms->accelerator);
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int ret;
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ret = kvm_check_extension(s, KVM_CAP_ARM_VM_IPA_SIZE);
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return ret > 0 ? ret : 40;
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}
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int kvm_arch_init(MachineState *ms, KVMState *s)
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{
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int ret = 0;
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/* For ARM interrupt delivery is always asynchronous,
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* whether we are using an in-kernel VGIC or not.
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*/
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kvm_async_interrupts_allowed = true;
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/*
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* PSCI wakes up secondary cores, so we always need to
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* have vCPUs waiting in kernel space
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*/
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kvm_halt_in_kernel_allowed = true;
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cap_has_mp_state = kvm_check_extension(s, KVM_CAP_MP_STATE);
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if (ms->smp.cpus > 256 &&
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!kvm_check_extension(s, KVM_CAP_ARM_IRQ_LINE_LAYOUT_2)) {
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error_report("Using more than 256 vcpus requires a host kernel "
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"with KVM_CAP_ARM_IRQ_LINE_LAYOUT_2");
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ret = -EINVAL;
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}
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if (kvm_check_extension(s, KVM_CAP_ARM_NISV_TO_USER)) {
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if (kvm_vm_enable_cap(s, KVM_CAP_ARM_NISV_TO_USER, 0)) {
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error_report("Failed to enable KVM_CAP_ARM_NISV_TO_USER cap");
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} else {
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/* Set status for supporting the external dabt injection */
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cap_has_inject_ext_dabt = kvm_check_extension(s,
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KVM_CAP_ARM_INJECT_EXT_DABT);
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}
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}
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return ret;
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}
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unsigned long kvm_arch_vcpu_id(CPUState *cpu)
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{
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return cpu->cpu_index;
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}
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/* We track all the KVM devices which need their memory addresses
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* passing to the kernel in a list of these structures.
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* When board init is complete we run through the list and
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* tell the kernel the base addresses of the memory regions.
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* We use a MemoryListener to track mapping and unmapping of
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* the regions during board creation, so the board models don't
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* need to do anything special for the KVM case.
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*
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* Sometimes the address must be OR'ed with some other fields
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* (for example for KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION).
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* @kda_addr_ormask aims at storing the value of those fields.
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*/
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typedef struct KVMDevice {
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struct kvm_arm_device_addr kda;
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struct kvm_device_attr kdattr;
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uint64_t kda_addr_ormask;
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MemoryRegion *mr;
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QSLIST_ENTRY(KVMDevice) entries;
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int dev_fd;
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} KVMDevice;
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static QSLIST_HEAD(, KVMDevice) kvm_devices_head;
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static void kvm_arm_devlistener_add(MemoryListener *listener,
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MemoryRegionSection *section)
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{
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KVMDevice *kd;
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QSLIST_FOREACH(kd, &kvm_devices_head, entries) {
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if (section->mr == kd->mr) {
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kd->kda.addr = section->offset_within_address_space;
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}
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}
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}
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static void kvm_arm_devlistener_del(MemoryListener *listener,
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MemoryRegionSection *section)
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{
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KVMDevice *kd;
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QSLIST_FOREACH(kd, &kvm_devices_head, entries) {
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if (section->mr == kd->mr) {
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kd->kda.addr = -1;
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}
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}
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}
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static MemoryListener devlistener = {
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.region_add = kvm_arm_devlistener_add,
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.region_del = kvm_arm_devlistener_del,
|
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};
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|
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static void kvm_arm_set_device_addr(KVMDevice *kd)
|
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{
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struct kvm_device_attr *attr = &kd->kdattr;
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int ret;
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/* If the device control API is available and we have a device fd on the
|
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* KVMDevice struct, let's use the newer API
|
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*/
|
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if (kd->dev_fd >= 0) {
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uint64_t addr = kd->kda.addr;
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|
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addr |= kd->kda_addr_ormask;
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attr->addr = (uintptr_t)&addr;
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ret = kvm_device_ioctl(kd->dev_fd, KVM_SET_DEVICE_ATTR, attr);
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} else {
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ret = kvm_vm_ioctl(kvm_state, KVM_ARM_SET_DEVICE_ADDR, &kd->kda);
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}
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|
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if (ret < 0) {
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fprintf(stderr, "Failed to set device address: %s\n",
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strerror(-ret));
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abort();
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}
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}
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static void kvm_arm_machine_init_done(Notifier *notifier, void *data)
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{
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KVMDevice *kd, *tkd;
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QSLIST_FOREACH_SAFE(kd, &kvm_devices_head, entries, tkd) {
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if (kd->kda.addr != -1) {
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kvm_arm_set_device_addr(kd);
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}
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memory_region_unref(kd->mr);
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QSLIST_REMOVE_HEAD(&kvm_devices_head, entries);
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g_free(kd);
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}
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memory_listener_unregister(&devlistener);
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}
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|
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static Notifier notify = {
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.notify = kvm_arm_machine_init_done,
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};
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|
|
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void kvm_arm_register_device(MemoryRegion *mr, uint64_t devid, uint64_t group,
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uint64_t attr, int dev_fd, uint64_t addr_ormask)
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{
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KVMDevice *kd;
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|
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if (!kvm_irqchip_in_kernel()) {
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return;
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}
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|
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if (QSLIST_EMPTY(&kvm_devices_head)) {
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memory_listener_register(&devlistener, &address_space_memory);
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qemu_add_machine_init_done_notifier(¬ify);
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}
|
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kd = g_new0(KVMDevice, 1);
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kd->mr = mr;
|
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kd->kda.id = devid;
|
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kd->kda.addr = -1;
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kd->kdattr.flags = 0;
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kd->kdattr.group = group;
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kd->kdattr.attr = attr;
|
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kd->dev_fd = dev_fd;
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kd->kda_addr_ormask = addr_ormask;
|
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QSLIST_INSERT_HEAD(&kvm_devices_head, kd, entries);
|
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memory_region_ref(kd->mr);
|
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}
|
|
|
|
static int compare_u64(const void *a, const void *b)
|
|
{
|
|
if (*(uint64_t *)a > *(uint64_t *)b) {
|
|
return 1;
|
|
}
|
|
if (*(uint64_t *)a < *(uint64_t *)b) {
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* cpreg_values are sorted in ascending order by KVM register ID
|
|
* (see kvm_arm_init_cpreg_list). This allows us to cheaply find
|
|
* the storage for a KVM register by ID with a binary search.
|
|
*/
|
|
static uint64_t *kvm_arm_get_cpreg_ptr(ARMCPU *cpu, uint64_t regidx)
|
|
{
|
|
uint64_t *res;
|
|
|
|
res = bsearch(®idx, cpu->cpreg_indexes, cpu->cpreg_array_len,
|
|
sizeof(uint64_t), compare_u64);
|
|
assert(res);
|
|
|
|
return &cpu->cpreg_values[res - cpu->cpreg_indexes];
|
|
}
|
|
|
|
/* Initialize the ARMCPU cpreg list according to the kernel's
|
|
* definition of what CPU registers it knows about (and throw away
|
|
* the previous TCG-created cpreg list).
|
|
*/
|
|
int kvm_arm_init_cpreg_list(ARMCPU *cpu)
|
|
{
|
|
struct kvm_reg_list rl;
|
|
struct kvm_reg_list *rlp;
|
|
int i, ret, arraylen;
|
|
CPUState *cs = CPU(cpu);
|
|
|
|
rl.n = 0;
|
|
ret = kvm_vcpu_ioctl(cs, KVM_GET_REG_LIST, &rl);
|
|
if (ret != -E2BIG) {
|
|
return ret;
|
|
}
|
|
rlp = g_malloc(sizeof(struct kvm_reg_list) + rl.n * sizeof(uint64_t));
|
|
rlp->n = rl.n;
|
|
ret = kvm_vcpu_ioctl(cs, KVM_GET_REG_LIST, rlp);
|
|
if (ret) {
|
|
goto out;
|
|
}
|
|
/* Sort the list we get back from the kernel, since cpreg_tuples
|
|
* must be in strictly ascending order.
|
|
*/
|
|
qsort(&rlp->reg, rlp->n, sizeof(rlp->reg[0]), compare_u64);
|
|
|
|
for (i = 0, arraylen = 0; i < rlp->n; i++) {
|
|
if (!kvm_arm_reg_syncs_via_cpreg_list(rlp->reg[i])) {
|
|
continue;
|
|
}
|
|
switch (rlp->reg[i] & KVM_REG_SIZE_MASK) {
|
|
case KVM_REG_SIZE_U32:
|
|
case KVM_REG_SIZE_U64:
|
|
break;
|
|
default:
|
|
fprintf(stderr, "Can't handle size of register in kernel list\n");
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
arraylen++;
|
|
}
|
|
|
|
cpu->cpreg_indexes = g_renew(uint64_t, cpu->cpreg_indexes, arraylen);
|
|
cpu->cpreg_values = g_renew(uint64_t, cpu->cpreg_values, arraylen);
|
|
cpu->cpreg_vmstate_indexes = g_renew(uint64_t, cpu->cpreg_vmstate_indexes,
|
|
arraylen);
|
|
cpu->cpreg_vmstate_values = g_renew(uint64_t, cpu->cpreg_vmstate_values,
|
|
arraylen);
|
|
cpu->cpreg_array_len = arraylen;
|
|
cpu->cpreg_vmstate_array_len = arraylen;
|
|
|
|
for (i = 0, arraylen = 0; i < rlp->n; i++) {
|
|
uint64_t regidx = rlp->reg[i];
|
|
if (!kvm_arm_reg_syncs_via_cpreg_list(regidx)) {
|
|
continue;
|
|
}
|
|
cpu->cpreg_indexes[arraylen] = regidx;
|
|
arraylen++;
|
|
}
|
|
assert(cpu->cpreg_array_len == arraylen);
|
|
|
|
if (!write_kvmstate_to_list(cpu)) {
|
|
/* Shouldn't happen unless kernel is inconsistent about
|
|
* what registers exist.
|
|
*/
|
|
fprintf(stderr, "Initial read of kernel register state failed\n");
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
out:
|
|
g_free(rlp);
|
|
return ret;
|
|
}
|
|
|
|
bool write_kvmstate_to_list(ARMCPU *cpu)
|
|
{
|
|
CPUState *cs = CPU(cpu);
|
|
int i;
|
|
bool ok = true;
|
|
|
|
for (i = 0; i < cpu->cpreg_array_len; i++) {
|
|
struct kvm_one_reg r;
|
|
uint64_t regidx = cpu->cpreg_indexes[i];
|
|
uint32_t v32;
|
|
int ret;
|
|
|
|
r.id = regidx;
|
|
|
|
switch (regidx & KVM_REG_SIZE_MASK) {
|
|
case KVM_REG_SIZE_U32:
|
|
r.addr = (uintptr_t)&v32;
|
|
ret = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &r);
|
|
if (!ret) {
|
|
cpu->cpreg_values[i] = v32;
|
|
}
|
|
break;
|
|
case KVM_REG_SIZE_U64:
|
|
r.addr = (uintptr_t)(cpu->cpreg_values + i);
|
|
ret = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &r);
|
|
break;
|
|
default:
|
|
abort();
|
|
}
|
|
if (ret) {
|
|
ok = false;
|
|
}
|
|
}
|
|
return ok;
|
|
}
|
|
|
|
bool write_list_to_kvmstate(ARMCPU *cpu, int level)
|
|
{
|
|
CPUState *cs = CPU(cpu);
|
|
int i;
|
|
bool ok = true;
|
|
|
|
for (i = 0; i < cpu->cpreg_array_len; i++) {
|
|
struct kvm_one_reg r;
|
|
uint64_t regidx = cpu->cpreg_indexes[i];
|
|
uint32_t v32;
|
|
int ret;
|
|
|
|
if (kvm_arm_cpreg_level(regidx) > level) {
|
|
continue;
|
|
}
|
|
|
|
r.id = regidx;
|
|
switch (regidx & KVM_REG_SIZE_MASK) {
|
|
case KVM_REG_SIZE_U32:
|
|
v32 = cpu->cpreg_values[i];
|
|
r.addr = (uintptr_t)&v32;
|
|
break;
|
|
case KVM_REG_SIZE_U64:
|
|
r.addr = (uintptr_t)(cpu->cpreg_values + i);
|
|
break;
|
|
default:
|
|
abort();
|
|
}
|
|
ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &r);
|
|
if (ret) {
|
|
/* We might fail for "unknown register" and also for
|
|
* "you tried to set a register which is constant with
|
|
* a different value from what it actually contains".
|
|
*/
|
|
ok = false;
|
|
}
|
|
}
|
|
return ok;
|
|
}
|
|
|
|
void kvm_arm_cpu_pre_save(ARMCPU *cpu)
|
|
{
|
|
/* KVM virtual time adjustment */
|
|
if (cpu->kvm_vtime_dirty) {
|
|
*kvm_arm_get_cpreg_ptr(cpu, KVM_REG_ARM_TIMER_CNT) = cpu->kvm_vtime;
|
|
}
|
|
}
|
|
|
|
void kvm_arm_cpu_post_load(ARMCPU *cpu)
|
|
{
|
|
/* KVM virtual time adjustment */
|
|
if (cpu->kvm_adjvtime) {
|
|
cpu->kvm_vtime = *kvm_arm_get_cpreg_ptr(cpu, KVM_REG_ARM_TIMER_CNT);
|
|
cpu->kvm_vtime_dirty = true;
|
|
}
|
|
}
|
|
|
|
void kvm_arm_reset_vcpu(ARMCPU *cpu)
|
|
{
|
|
int ret;
|
|
|
|
/* Re-init VCPU so that all registers are set to
|
|
* their respective reset values.
|
|
*/
|
|
ret = kvm_arm_vcpu_init(CPU(cpu));
|
|
if (ret < 0) {
|
|
fprintf(stderr, "kvm_arm_vcpu_init failed: %s\n", strerror(-ret));
|
|
abort();
|
|
}
|
|
if (!write_kvmstate_to_list(cpu)) {
|
|
fprintf(stderr, "write_kvmstate_to_list failed\n");
|
|
abort();
|
|
}
|
|
/*
|
|
* Sync the reset values also into the CPUState. This is necessary
|
|
* because the next thing we do will be a kvm_arch_put_registers()
|
|
* which will update the list values from the CPUState before copying
|
|
* the list values back to KVM. It's OK to ignore failure returns here
|
|
* for the same reason we do so in kvm_arch_get_registers().
|
|
*/
|
|
write_list_to_cpustate(cpu);
|
|
}
|
|
|
|
/*
|
|
* Update KVM's MP_STATE based on what QEMU thinks it is
|
|
*/
|
|
int kvm_arm_sync_mpstate_to_kvm(ARMCPU *cpu)
|
|
{
|
|
if (cap_has_mp_state) {
|
|
struct kvm_mp_state mp_state = {
|
|
.mp_state = (cpu->power_state == PSCI_OFF) ?
|
|
KVM_MP_STATE_STOPPED : KVM_MP_STATE_RUNNABLE
|
|
};
|
|
int ret = kvm_vcpu_ioctl(CPU(cpu), KVM_SET_MP_STATE, &mp_state);
|
|
if (ret) {
|
|
fprintf(stderr, "%s: failed to set MP_STATE %d/%s\n",
|
|
__func__, ret, strerror(-ret));
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Sync the KVM MP_STATE into QEMU
|
|
*/
|
|
int kvm_arm_sync_mpstate_to_qemu(ARMCPU *cpu)
|
|
{
|
|
if (cap_has_mp_state) {
|
|
struct kvm_mp_state mp_state;
|
|
int ret = kvm_vcpu_ioctl(CPU(cpu), KVM_GET_MP_STATE, &mp_state);
|
|
if (ret) {
|
|
fprintf(stderr, "%s: failed to get MP_STATE %d/%s\n",
|
|
__func__, ret, strerror(-ret));
|
|
abort();
|
|
}
|
|
cpu->power_state = (mp_state.mp_state == KVM_MP_STATE_STOPPED) ?
|
|
PSCI_OFF : PSCI_ON;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void kvm_arm_get_virtual_time(CPUState *cs)
|
|
{
|
|
ARMCPU *cpu = ARM_CPU(cs);
|
|
struct kvm_one_reg reg = {
|
|
.id = KVM_REG_ARM_TIMER_CNT,
|
|
.addr = (uintptr_t)&cpu->kvm_vtime,
|
|
};
|
|
int ret;
|
|
|
|
if (cpu->kvm_vtime_dirty) {
|
|
return;
|
|
}
|
|
|
|
ret = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, ®);
|
|
if (ret) {
|
|
error_report("Failed to get KVM_REG_ARM_TIMER_CNT");
|
|
abort();
|
|
}
|
|
|
|
cpu->kvm_vtime_dirty = true;
|
|
}
|
|
|
|
void kvm_arm_put_virtual_time(CPUState *cs)
|
|
{
|
|
ARMCPU *cpu = ARM_CPU(cs);
|
|
struct kvm_one_reg reg = {
|
|
.id = KVM_REG_ARM_TIMER_CNT,
|
|
.addr = (uintptr_t)&cpu->kvm_vtime,
|
|
};
|
|
int ret;
|
|
|
|
if (!cpu->kvm_vtime_dirty) {
|
|
return;
|
|
}
|
|
|
|
ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, ®);
|
|
if (ret) {
|
|
error_report("Failed to set KVM_REG_ARM_TIMER_CNT");
|
|
abort();
|
|
}
|
|
|
|
cpu->kvm_vtime_dirty = false;
|
|
}
|
|
|
|
int kvm_put_vcpu_events(ARMCPU *cpu)
|
|
{
|
|
CPUARMState *env = &cpu->env;
|
|
struct kvm_vcpu_events events;
|
|
int ret;
|
|
|
|
if (!kvm_has_vcpu_events()) {
|
|
return 0;
|
|
}
|
|
|
|
memset(&events, 0, sizeof(events));
|
|
events.exception.serror_pending = env->serror.pending;
|
|
|
|
/* Inject SError to guest with specified syndrome if host kernel
|
|
* supports it, otherwise inject SError without syndrome.
|
|
*/
|
|
if (cap_has_inject_serror_esr) {
|
|
events.exception.serror_has_esr = env->serror.has_esr;
|
|
events.exception.serror_esr = env->serror.esr;
|
|
}
|
|
|
|
ret = kvm_vcpu_ioctl(CPU(cpu), KVM_SET_VCPU_EVENTS, &events);
|
|
if (ret) {
|
|
error_report("failed to put vcpu events");
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
int kvm_get_vcpu_events(ARMCPU *cpu)
|
|
{
|
|
CPUARMState *env = &cpu->env;
|
|
struct kvm_vcpu_events events;
|
|
int ret;
|
|
|
|
if (!kvm_has_vcpu_events()) {
|
|
return 0;
|
|
}
|
|
|
|
memset(&events, 0, sizeof(events));
|
|
ret = kvm_vcpu_ioctl(CPU(cpu), KVM_GET_VCPU_EVENTS, &events);
|
|
if (ret) {
|
|
error_report("failed to get vcpu events");
|
|
return ret;
|
|
}
|
|
|
|
env->serror.pending = events.exception.serror_pending;
|
|
env->serror.has_esr = events.exception.serror_has_esr;
|
|
env->serror.esr = events.exception.serror_esr;
|
|
|
|
return 0;
|
|
}
|
|
|
|
void kvm_arch_pre_run(CPUState *cs, struct kvm_run *run)
|
|
{
|
|
ARMCPU *cpu = ARM_CPU(cs);
|
|
CPUARMState *env = &cpu->env;
|
|
|
|
if (unlikely(env->ext_dabt_raised)) {
|
|
/*
|
|
* Verifying that the ext DABT has been properly injected,
|
|
* otherwise risking indefinitely re-running the faulting instruction
|
|
* Covering a very narrow case for kernels 5.5..5.5.4
|
|
* when injected abort was misconfigured to be
|
|
* an IMPLEMENTATION DEFINED exception (for 32-bit EL1)
|
|
*/
|
|
if (!arm_feature(env, ARM_FEATURE_AARCH64) &&
|
|
unlikely(!kvm_arm_verify_ext_dabt_pending(cs))) {
|
|
|
|
error_report("Data abort exception with no valid ISS generated by "
|
|
"guest memory access. KVM unable to emulate faulting "
|
|
"instruction. Failed to inject an external data abort "
|
|
"into the guest.");
|
|
abort();
|
|
}
|
|
/* Clear the status */
|
|
env->ext_dabt_raised = 0;
|
|
}
|
|
}
|
|
|
|
MemTxAttrs kvm_arch_post_run(CPUState *cs, struct kvm_run *run)
|
|
{
|
|
ARMCPU *cpu;
|
|
uint32_t switched_level;
|
|
|
|
if (kvm_irqchip_in_kernel()) {
|
|
/*
|
|
* We only need to sync timer states with user-space interrupt
|
|
* controllers, so return early and save cycles if we don't.
|
|
*/
|
|
return MEMTXATTRS_UNSPECIFIED;
|
|
}
|
|
|
|
cpu = ARM_CPU(cs);
|
|
|
|
/* Synchronize our shadowed in-kernel device irq lines with the kvm ones */
|
|
if (run->s.regs.device_irq_level != cpu->device_irq_level) {
|
|
switched_level = cpu->device_irq_level ^ run->s.regs.device_irq_level;
|
|
|
|
qemu_mutex_lock_iothread();
|
|
|
|
if (switched_level & KVM_ARM_DEV_EL1_VTIMER) {
|
|
qemu_set_irq(cpu->gt_timer_outputs[GTIMER_VIRT],
|
|
!!(run->s.regs.device_irq_level &
|
|
KVM_ARM_DEV_EL1_VTIMER));
|
|
switched_level &= ~KVM_ARM_DEV_EL1_VTIMER;
|
|
}
|
|
|
|
if (switched_level & KVM_ARM_DEV_EL1_PTIMER) {
|
|
qemu_set_irq(cpu->gt_timer_outputs[GTIMER_PHYS],
|
|
!!(run->s.regs.device_irq_level &
|
|
KVM_ARM_DEV_EL1_PTIMER));
|
|
switched_level &= ~KVM_ARM_DEV_EL1_PTIMER;
|
|
}
|
|
|
|
if (switched_level & KVM_ARM_DEV_PMU) {
|
|
qemu_set_irq(cpu->pmu_interrupt,
|
|
!!(run->s.regs.device_irq_level & KVM_ARM_DEV_PMU));
|
|
switched_level &= ~KVM_ARM_DEV_PMU;
|
|
}
|
|
|
|
if (switched_level) {
|
|
qemu_log_mask(LOG_UNIMP, "%s: unhandled in-kernel device IRQ %x\n",
|
|
__func__, switched_level);
|
|
}
|
|
|
|
/* We also mark unknown levels as processed to not waste cycles */
|
|
cpu->device_irq_level = run->s.regs.device_irq_level;
|
|
qemu_mutex_unlock_iothread();
|
|
}
|
|
|
|
return MEMTXATTRS_UNSPECIFIED;
|
|
}
|
|
|
|
void kvm_arm_vm_state_change(void *opaque, int running, RunState state)
|
|
{
|
|
CPUState *cs = opaque;
|
|
ARMCPU *cpu = ARM_CPU(cs);
|
|
|
|
if (running) {
|
|
if (cpu->kvm_adjvtime) {
|
|
kvm_arm_put_virtual_time(cs);
|
|
}
|
|
} else {
|
|
if (cpu->kvm_adjvtime) {
|
|
kvm_arm_get_virtual_time(cs);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* kvm_arm_handle_dabt_nisv:
|
|
* @cs: CPUState
|
|
* @esr_iss: ISS encoding (limited) for the exception from Data Abort
|
|
* ISV bit set to '0b0' -> no valid instruction syndrome
|
|
* @fault_ipa: faulting address for the synchronous data abort
|
|
*
|
|
* Returns: 0 if the exception has been handled, < 0 otherwise
|
|
*/
|
|
static int kvm_arm_handle_dabt_nisv(CPUState *cs, uint64_t esr_iss,
|
|
uint64_t fault_ipa)
|
|
{
|
|
ARMCPU *cpu = ARM_CPU(cs);
|
|
CPUARMState *env = &cpu->env;
|
|
/*
|
|
* Request KVM to inject the external data abort into the guest
|
|
*/
|
|
if (cap_has_inject_ext_dabt) {
|
|
struct kvm_vcpu_events events = { };
|
|
/*
|
|
* The external data abort event will be handled immediately by KVM
|
|
* using the address fault that triggered the exit on given VCPU.
|
|
* Requesting injection of the external data abort does not rely
|
|
* on any other VCPU state. Therefore, in this particular case, the VCPU
|
|
* synchronization can be exceptionally skipped.
|
|
*/
|
|
events.exception.ext_dabt_pending = 1;
|
|
/* KVM_CAP_ARM_INJECT_EXT_DABT implies KVM_CAP_VCPU_EVENTS */
|
|
if (!kvm_vcpu_ioctl(cs, KVM_SET_VCPU_EVENTS, &events)) {
|
|
env->ext_dabt_raised = 1;
|
|
return 0;
|
|
}
|
|
} else {
|
|
error_report("Data abort exception triggered by guest memory access "
|
|
"at physical address: 0x" TARGET_FMT_lx,
|
|
(target_ulong)fault_ipa);
|
|
error_printf("KVM unable to emulate faulting instruction.\n");
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
int kvm_arch_handle_exit(CPUState *cs, struct kvm_run *run)
|
|
{
|
|
int ret = 0;
|
|
|
|
switch (run->exit_reason) {
|
|
case KVM_EXIT_DEBUG:
|
|
if (kvm_arm_handle_debug(cs, &run->debug.arch)) {
|
|
ret = EXCP_DEBUG;
|
|
} /* otherwise return to guest */
|
|
break;
|
|
case KVM_EXIT_ARM_NISV:
|
|
/* External DABT with no valid iss to decode */
|
|
ret = kvm_arm_handle_dabt_nisv(cs, run->arm_nisv.esr_iss,
|
|
run->arm_nisv.fault_ipa);
|
|
break;
|
|
default:
|
|
qemu_log_mask(LOG_UNIMP, "%s: un-handled exit reason %d\n",
|
|
__func__, run->exit_reason);
|
|
break;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
bool kvm_arch_stop_on_emulation_error(CPUState *cs)
|
|
{
|
|
return true;
|
|
}
|
|
|
|
int kvm_arch_process_async_events(CPUState *cs)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
void kvm_arch_update_guest_debug(CPUState *cs, struct kvm_guest_debug *dbg)
|
|
{
|
|
if (kvm_sw_breakpoints_active(cs)) {
|
|
dbg->control |= KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_SW_BP;
|
|
}
|
|
if (kvm_arm_hw_debug_active(cs)) {
|
|
dbg->control |= KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_HW;
|
|
kvm_arm_copy_hw_debug_data(&dbg->arch);
|
|
}
|
|
}
|
|
|
|
void kvm_arch_init_irq_routing(KVMState *s)
|
|
{
|
|
}
|
|
|
|
int kvm_arch_irqchip_create(KVMState *s)
|
|
{
|
|
if (kvm_kernel_irqchip_split()) {
|
|
perror("-machine kernel_irqchip=split is not supported on ARM.");
|
|
exit(1);
|
|
}
|
|
|
|
/* If we can create the VGIC using the newer device control API, we
|
|
* let the device do this when it initializes itself, otherwise we
|
|
* fall back to the old API */
|
|
return kvm_check_extension(s, KVM_CAP_DEVICE_CTRL);
|
|
}
|
|
|
|
int kvm_arm_vgic_probe(void)
|
|
{
|
|
int val = 0;
|
|
|
|
if (kvm_create_device(kvm_state,
|
|
KVM_DEV_TYPE_ARM_VGIC_V3, true) == 0) {
|
|
val |= KVM_ARM_VGIC_V3;
|
|
}
|
|
if (kvm_create_device(kvm_state,
|
|
KVM_DEV_TYPE_ARM_VGIC_V2, true) == 0) {
|
|
val |= KVM_ARM_VGIC_V2;
|
|
}
|
|
return val;
|
|
}
|
|
|
|
int kvm_arm_set_irq(int cpu, int irqtype, int irq, int level)
|
|
{
|
|
int kvm_irq = (irqtype << KVM_ARM_IRQ_TYPE_SHIFT) | irq;
|
|
int cpu_idx1 = cpu % 256;
|
|
int cpu_idx2 = cpu / 256;
|
|
|
|
kvm_irq |= (cpu_idx1 << KVM_ARM_IRQ_VCPU_SHIFT) |
|
|
(cpu_idx2 << KVM_ARM_IRQ_VCPU2_SHIFT);
|
|
|
|
return kvm_set_irq(kvm_state, kvm_irq, !!level);
|
|
}
|
|
|
|
int kvm_arch_fixup_msi_route(struct kvm_irq_routing_entry *route,
|
|
uint64_t address, uint32_t data, PCIDevice *dev)
|
|
{
|
|
AddressSpace *as = pci_device_iommu_address_space(dev);
|
|
hwaddr xlat, len, doorbell_gpa;
|
|
MemoryRegionSection mrs;
|
|
MemoryRegion *mr;
|
|
int ret = 1;
|
|
|
|
if (as == &address_space_memory) {
|
|
return 0;
|
|
}
|
|
|
|
/* MSI doorbell address is translated by an IOMMU */
|
|
|
|
rcu_read_lock();
|
|
mr = address_space_translate(as, address, &xlat, &len, true,
|
|
MEMTXATTRS_UNSPECIFIED);
|
|
if (!mr) {
|
|
goto unlock;
|
|
}
|
|
mrs = memory_region_find(mr, xlat, 1);
|
|
if (!mrs.mr) {
|
|
goto unlock;
|
|
}
|
|
|
|
doorbell_gpa = mrs.offset_within_address_space;
|
|
memory_region_unref(mrs.mr);
|
|
|
|
route->u.msi.address_lo = doorbell_gpa;
|
|
route->u.msi.address_hi = doorbell_gpa >> 32;
|
|
|
|
trace_kvm_arm_fixup_msi_route(address, doorbell_gpa);
|
|
|
|
ret = 0;
|
|
|
|
unlock:
|
|
rcu_read_unlock();
|
|
return ret;
|
|
}
|
|
|
|
int kvm_arch_add_msi_route_post(struct kvm_irq_routing_entry *route,
|
|
int vector, PCIDevice *dev)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
int kvm_arch_release_virq_post(int virq)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
int kvm_arch_msi_data_to_gsi(uint32_t data)
|
|
{
|
|
return (data - 32) & 0xffff;
|
|
}
|
|
|
|
bool kvm_arch_cpu_check_are_resettable(void)
|
|
{
|
|
return true;
|
|
}
|