Generated using: $ ./scripts/codeconverter/converter.py -i \ --pattern=TypeCheckMacro $(git grep -l '' -- '*.[ch]') Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Message-Id: <20200831210740.126168-12-ehabkost@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Message-Id: <20200831210740.126168-13-ehabkost@redhat.com> Message-Id: <20200831210740.126168-14-ehabkost@redhat.com> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
797 lines
20 KiB
C
797 lines
20 KiB
C
/*
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* QEMU SEV support
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*
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* Copyright Advanced Micro Devices 2016-2018
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*
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* Author:
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* Brijesh Singh <brijesh.singh@amd.com>
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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 <linux/kvm.h>
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#include <linux/psp-sev.h>
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#include <sys/ioctl.h>
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#include "qapi/error.h"
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#include "qom/object_interfaces.h"
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#include "qemu/base64.h"
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#include "qemu/module.h"
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#include "sysemu/kvm.h"
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#include "sev_i386.h"
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#include "sysemu/sysemu.h"
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#include "sysemu/runstate.h"
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#include "trace.h"
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#include "migration/blocker.h"
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#include "qom/object.h"
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#define TYPE_SEV_GUEST "sev-guest"
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typedef struct SevGuestState SevGuestState;
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DECLARE_INSTANCE_CHECKER(SevGuestState, SEV_GUEST,
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TYPE_SEV_GUEST)
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/**
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* SevGuestState:
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*
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* The SevGuestState object is used for creating and managing a SEV
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* guest.
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*
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* # $QEMU \
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* -object sev-guest,id=sev0 \
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* -machine ...,memory-encryption=sev0
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*/
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struct SevGuestState {
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Object parent_obj;
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/* configuration parameters */
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char *sev_device;
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uint32_t policy;
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char *dh_cert_file;
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char *session_file;
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uint32_t cbitpos;
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uint32_t reduced_phys_bits;
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/* runtime state */
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uint32_t handle;
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uint8_t api_major;
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uint8_t api_minor;
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uint8_t build_id;
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uint64_t me_mask;
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int sev_fd;
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SevState state;
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gchar *measurement;
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};
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#define DEFAULT_GUEST_POLICY 0x1 /* disable debug */
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#define DEFAULT_SEV_DEVICE "/dev/sev"
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static SevGuestState *sev_guest;
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static Error *sev_mig_blocker;
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static const char *const sev_fw_errlist[] = {
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"",
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"Platform state is invalid",
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"Guest state is invalid",
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"Platform configuration is invalid",
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"Buffer too small",
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"Platform is already owned",
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"Certificate is invalid",
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"Policy is not allowed",
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"Guest is not active",
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"Invalid address",
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"Bad signature",
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"Bad measurement",
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"Asid is already owned",
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"Invalid ASID",
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"WBINVD is required",
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"DF_FLUSH is required",
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"Guest handle is invalid",
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"Invalid command",
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"Guest is active",
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"Hardware error",
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"Hardware unsafe",
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"Feature not supported",
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"Invalid parameter"
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};
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#define SEV_FW_MAX_ERROR ARRAY_SIZE(sev_fw_errlist)
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static int
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sev_ioctl(int fd, int cmd, void *data, int *error)
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{
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int r;
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struct kvm_sev_cmd input;
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memset(&input, 0x0, sizeof(input));
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input.id = cmd;
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input.sev_fd = fd;
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input.data = (__u64)(unsigned long)data;
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r = kvm_vm_ioctl(kvm_state, KVM_MEMORY_ENCRYPT_OP, &input);
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if (error) {
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*error = input.error;
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}
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return r;
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}
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static int
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sev_platform_ioctl(int fd, int cmd, void *data, int *error)
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{
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int r;
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struct sev_issue_cmd arg;
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arg.cmd = cmd;
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arg.data = (unsigned long)data;
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r = ioctl(fd, SEV_ISSUE_CMD, &arg);
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if (error) {
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*error = arg.error;
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}
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return r;
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}
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static const char *
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fw_error_to_str(int code)
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{
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if (code < 0 || code >= SEV_FW_MAX_ERROR) {
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return "unknown error";
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}
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return sev_fw_errlist[code];
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}
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static bool
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sev_check_state(const SevGuestState *sev, SevState state)
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{
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assert(sev);
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return sev->state == state ? true : false;
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}
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static void
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sev_set_guest_state(SevGuestState *sev, SevState new_state)
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{
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assert(new_state < SEV_STATE__MAX);
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assert(sev);
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trace_kvm_sev_change_state(SevState_str(sev->state),
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SevState_str(new_state));
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sev->state = new_state;
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}
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static void
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sev_ram_block_added(RAMBlockNotifier *n, void *host, size_t size)
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{
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int r;
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struct kvm_enc_region range;
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ram_addr_t offset;
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MemoryRegion *mr;
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/*
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* The RAM device presents a memory region that should be treated
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* as IO region and should not be pinned.
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*/
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mr = memory_region_from_host(host, &offset);
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if (mr && memory_region_is_ram_device(mr)) {
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return;
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}
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range.addr = (__u64)(unsigned long)host;
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range.size = size;
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trace_kvm_memcrypt_register_region(host, size);
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r = kvm_vm_ioctl(kvm_state, KVM_MEMORY_ENCRYPT_REG_REGION, &range);
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if (r) {
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error_report("%s: failed to register region (%p+%#zx) error '%s'",
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__func__, host, size, strerror(errno));
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exit(1);
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}
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}
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static void
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sev_ram_block_removed(RAMBlockNotifier *n, void *host, size_t size)
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{
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int r;
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struct kvm_enc_region range;
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ram_addr_t offset;
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MemoryRegion *mr;
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/*
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* The RAM device presents a memory region that should be treated
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* as IO region and should not have been pinned.
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*/
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mr = memory_region_from_host(host, &offset);
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if (mr && memory_region_is_ram_device(mr)) {
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return;
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}
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range.addr = (__u64)(unsigned long)host;
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range.size = size;
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trace_kvm_memcrypt_unregister_region(host, size);
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r = kvm_vm_ioctl(kvm_state, KVM_MEMORY_ENCRYPT_UNREG_REGION, &range);
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if (r) {
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error_report("%s: failed to unregister region (%p+%#zx)",
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__func__, host, size);
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}
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}
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static struct RAMBlockNotifier sev_ram_notifier = {
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.ram_block_added = sev_ram_block_added,
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.ram_block_removed = sev_ram_block_removed,
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};
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static void
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sev_guest_finalize(Object *obj)
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{
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}
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static char *
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sev_guest_get_session_file(Object *obj, Error **errp)
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{
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SevGuestState *s = SEV_GUEST(obj);
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return s->session_file ? g_strdup(s->session_file) : NULL;
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}
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static void
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sev_guest_set_session_file(Object *obj, const char *value, Error **errp)
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{
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SevGuestState *s = SEV_GUEST(obj);
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s->session_file = g_strdup(value);
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}
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static char *
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sev_guest_get_dh_cert_file(Object *obj, Error **errp)
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{
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SevGuestState *s = SEV_GUEST(obj);
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return g_strdup(s->dh_cert_file);
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}
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static void
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sev_guest_set_dh_cert_file(Object *obj, const char *value, Error **errp)
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{
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SevGuestState *s = SEV_GUEST(obj);
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s->dh_cert_file = g_strdup(value);
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}
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static char *
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sev_guest_get_sev_device(Object *obj, Error **errp)
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{
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SevGuestState *sev = SEV_GUEST(obj);
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return g_strdup(sev->sev_device);
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}
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static void
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sev_guest_set_sev_device(Object *obj, const char *value, Error **errp)
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{
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SevGuestState *sev = SEV_GUEST(obj);
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sev->sev_device = g_strdup(value);
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}
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static void
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sev_guest_class_init(ObjectClass *oc, void *data)
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{
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object_class_property_add_str(oc, "sev-device",
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sev_guest_get_sev_device,
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sev_guest_set_sev_device);
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object_class_property_set_description(oc, "sev-device",
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"SEV device to use");
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object_class_property_add_str(oc, "dh-cert-file",
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sev_guest_get_dh_cert_file,
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sev_guest_set_dh_cert_file);
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object_class_property_set_description(oc, "dh-cert-file",
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"guest owners DH certificate (encoded with base64)");
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object_class_property_add_str(oc, "session-file",
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sev_guest_get_session_file,
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sev_guest_set_session_file);
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object_class_property_set_description(oc, "session-file",
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"guest owners session parameters (encoded with base64)");
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}
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static void
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sev_guest_instance_init(Object *obj)
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{
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SevGuestState *sev = SEV_GUEST(obj);
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sev->sev_device = g_strdup(DEFAULT_SEV_DEVICE);
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sev->policy = DEFAULT_GUEST_POLICY;
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object_property_add_uint32_ptr(obj, "policy", &sev->policy,
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OBJ_PROP_FLAG_READWRITE);
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object_property_add_uint32_ptr(obj, "handle", &sev->handle,
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OBJ_PROP_FLAG_READWRITE);
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object_property_add_uint32_ptr(obj, "cbitpos", &sev->cbitpos,
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OBJ_PROP_FLAG_READWRITE);
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object_property_add_uint32_ptr(obj, "reduced-phys-bits",
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&sev->reduced_phys_bits,
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OBJ_PROP_FLAG_READWRITE);
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}
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/* sev guest info */
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static const TypeInfo sev_guest_info = {
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.parent = TYPE_OBJECT,
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.name = TYPE_SEV_GUEST,
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.instance_size = sizeof(SevGuestState),
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.instance_finalize = sev_guest_finalize,
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.class_init = sev_guest_class_init,
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.instance_init = sev_guest_instance_init,
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.interfaces = (InterfaceInfo[]) {
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{ TYPE_USER_CREATABLE },
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{ }
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}
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};
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static SevGuestState *
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lookup_sev_guest_info(const char *id)
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{
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Object *obj;
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SevGuestState *info;
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obj = object_resolve_path_component(object_get_objects_root(), id);
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if (!obj) {
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return NULL;
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}
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info = (SevGuestState *)
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object_dynamic_cast(obj, TYPE_SEV_GUEST);
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if (!info) {
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return NULL;
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}
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return info;
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}
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bool
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sev_enabled(void)
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{
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return !!sev_guest;
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}
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uint64_t
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sev_get_me_mask(void)
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{
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return sev_guest ? sev_guest->me_mask : ~0;
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}
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uint32_t
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sev_get_cbit_position(void)
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{
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return sev_guest ? sev_guest->cbitpos : 0;
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}
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uint32_t
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sev_get_reduced_phys_bits(void)
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{
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return sev_guest ? sev_guest->reduced_phys_bits : 0;
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}
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SevInfo *
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sev_get_info(void)
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{
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SevInfo *info;
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info = g_new0(SevInfo, 1);
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info->enabled = sev_enabled();
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if (info->enabled) {
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info->api_major = sev_guest->api_major;
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info->api_minor = sev_guest->api_minor;
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info->build_id = sev_guest->build_id;
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info->policy = sev_guest->policy;
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info->state = sev_guest->state;
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info->handle = sev_guest->handle;
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}
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return info;
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}
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static int
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sev_get_pdh_info(int fd, guchar **pdh, size_t *pdh_len, guchar **cert_chain,
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size_t *cert_chain_len, Error **errp)
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{
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guchar *pdh_data = NULL;
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guchar *cert_chain_data = NULL;
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struct sev_user_data_pdh_cert_export export = {};
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int err, r;
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/* query the certificate length */
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r = sev_platform_ioctl(fd, SEV_PDH_CERT_EXPORT, &export, &err);
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if (r < 0) {
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if (err != SEV_RET_INVALID_LEN) {
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error_setg(errp, "failed to export PDH cert ret=%d fw_err=%d (%s)",
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r, err, fw_error_to_str(err));
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return 1;
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}
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}
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pdh_data = g_new(guchar, export.pdh_cert_len);
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cert_chain_data = g_new(guchar, export.cert_chain_len);
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export.pdh_cert_address = (unsigned long)pdh_data;
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export.cert_chain_address = (unsigned long)cert_chain_data;
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r = sev_platform_ioctl(fd, SEV_PDH_CERT_EXPORT, &export, &err);
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if (r < 0) {
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error_setg(errp, "failed to export PDH cert ret=%d fw_err=%d (%s)",
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r, err, fw_error_to_str(err));
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goto e_free;
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}
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*pdh = pdh_data;
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*pdh_len = export.pdh_cert_len;
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*cert_chain = cert_chain_data;
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*cert_chain_len = export.cert_chain_len;
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return 0;
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e_free:
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g_free(pdh_data);
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g_free(cert_chain_data);
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return 1;
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}
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SevCapability *
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sev_get_capabilities(Error **errp)
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{
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SevCapability *cap = NULL;
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guchar *pdh_data = NULL;
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guchar *cert_chain_data = NULL;
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size_t pdh_len = 0, cert_chain_len = 0;
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uint32_t ebx;
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int fd;
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if (!kvm_enabled()) {
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error_setg(errp, "KVM not enabled");
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return NULL;
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}
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if (kvm_vm_ioctl(kvm_state, KVM_MEMORY_ENCRYPT_OP, NULL) < 0) {
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error_setg(errp, "SEV is not enabled in KVM");
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return NULL;
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}
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fd = open(DEFAULT_SEV_DEVICE, O_RDWR);
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if (fd < 0) {
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error_setg_errno(errp, errno, "Failed to open %s",
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DEFAULT_SEV_DEVICE);
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return NULL;
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}
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if (sev_get_pdh_info(fd, &pdh_data, &pdh_len,
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&cert_chain_data, &cert_chain_len, errp)) {
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goto out;
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}
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cap = g_new0(SevCapability, 1);
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cap->pdh = g_base64_encode(pdh_data, pdh_len);
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cap->cert_chain = g_base64_encode(cert_chain_data, cert_chain_len);
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host_cpuid(0x8000001F, 0, NULL, &ebx, NULL, NULL);
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cap->cbitpos = ebx & 0x3f;
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/*
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* When SEV feature is enabled, we loose one bit in guest physical
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* addressing.
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*/
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cap->reduced_phys_bits = 1;
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out:
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g_free(pdh_data);
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g_free(cert_chain_data);
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close(fd);
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return cap;
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}
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static int
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sev_read_file_base64(const char *filename, guchar **data, gsize *len)
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{
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gsize sz;
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gchar *base64;
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GError *error = NULL;
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if (!g_file_get_contents(filename, &base64, &sz, &error)) {
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error_report("failed to read '%s' (%s)", filename, error->message);
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g_error_free(error);
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return -1;
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}
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*data = g_base64_decode(base64, len);
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return 0;
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}
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static int
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sev_launch_start(SevGuestState *sev)
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{
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gsize sz;
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int ret = 1;
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int fw_error, rc;
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struct kvm_sev_launch_start *start;
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guchar *session = NULL, *dh_cert = NULL;
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start = g_new0(struct kvm_sev_launch_start, 1);
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start->handle = sev->handle;
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start->policy = sev->policy;
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if (sev->session_file) {
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if (sev_read_file_base64(sev->session_file, &session, &sz) < 0) {
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goto out;
|
|
}
|
|
start->session_uaddr = (unsigned long)session;
|
|
start->session_len = sz;
|
|
}
|
|
|
|
if (sev->dh_cert_file) {
|
|
if (sev_read_file_base64(sev->dh_cert_file, &dh_cert, &sz) < 0) {
|
|
goto out;
|
|
}
|
|
start->dh_uaddr = (unsigned long)dh_cert;
|
|
start->dh_len = sz;
|
|
}
|
|
|
|
trace_kvm_sev_launch_start(start->policy, session, dh_cert);
|
|
rc = sev_ioctl(sev->sev_fd, KVM_SEV_LAUNCH_START, start, &fw_error);
|
|
if (rc < 0) {
|
|
error_report("%s: LAUNCH_START ret=%d fw_error=%d '%s'",
|
|
__func__, ret, fw_error, fw_error_to_str(fw_error));
|
|
goto out;
|
|
}
|
|
|
|
sev_set_guest_state(sev, SEV_STATE_LAUNCH_UPDATE);
|
|
sev->handle = start->handle;
|
|
ret = 0;
|
|
|
|
out:
|
|
g_free(start);
|
|
g_free(session);
|
|
g_free(dh_cert);
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
sev_launch_update_data(SevGuestState *sev, uint8_t *addr, uint64_t len)
|
|
{
|
|
int ret, fw_error;
|
|
struct kvm_sev_launch_update_data update;
|
|
|
|
if (!addr || !len) {
|
|
return 1;
|
|
}
|
|
|
|
update.uaddr = (__u64)(unsigned long)addr;
|
|
update.len = len;
|
|
trace_kvm_sev_launch_update_data(addr, len);
|
|
ret = sev_ioctl(sev->sev_fd, KVM_SEV_LAUNCH_UPDATE_DATA,
|
|
&update, &fw_error);
|
|
if (ret) {
|
|
error_report("%s: LAUNCH_UPDATE ret=%d fw_error=%d '%s'",
|
|
__func__, ret, fw_error, fw_error_to_str(fw_error));
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void
|
|
sev_launch_get_measure(Notifier *notifier, void *unused)
|
|
{
|
|
SevGuestState *sev = sev_guest;
|
|
int ret, error;
|
|
guchar *data;
|
|
struct kvm_sev_launch_measure *measurement;
|
|
|
|
if (!sev_check_state(sev, SEV_STATE_LAUNCH_UPDATE)) {
|
|
return;
|
|
}
|
|
|
|
measurement = g_new0(struct kvm_sev_launch_measure, 1);
|
|
|
|
/* query the measurement blob length */
|
|
ret = sev_ioctl(sev->sev_fd, KVM_SEV_LAUNCH_MEASURE,
|
|
measurement, &error);
|
|
if (!measurement->len) {
|
|
error_report("%s: LAUNCH_MEASURE ret=%d fw_error=%d '%s'",
|
|
__func__, ret, error, fw_error_to_str(errno));
|
|
goto free_measurement;
|
|
}
|
|
|
|
data = g_new0(guchar, measurement->len);
|
|
measurement->uaddr = (unsigned long)data;
|
|
|
|
/* get the measurement blob */
|
|
ret = sev_ioctl(sev->sev_fd, KVM_SEV_LAUNCH_MEASURE,
|
|
measurement, &error);
|
|
if (ret) {
|
|
error_report("%s: LAUNCH_MEASURE ret=%d fw_error=%d '%s'",
|
|
__func__, ret, error, fw_error_to_str(errno));
|
|
goto free_data;
|
|
}
|
|
|
|
sev_set_guest_state(sev, SEV_STATE_LAUNCH_SECRET);
|
|
|
|
/* encode the measurement value and emit the event */
|
|
sev->measurement = g_base64_encode(data, measurement->len);
|
|
trace_kvm_sev_launch_measurement(sev->measurement);
|
|
|
|
free_data:
|
|
g_free(data);
|
|
free_measurement:
|
|
g_free(measurement);
|
|
}
|
|
|
|
char *
|
|
sev_get_launch_measurement(void)
|
|
{
|
|
if (sev_guest &&
|
|
sev_guest->state >= SEV_STATE_LAUNCH_SECRET) {
|
|
return g_strdup(sev_guest->measurement);
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static Notifier sev_machine_done_notify = {
|
|
.notify = sev_launch_get_measure,
|
|
};
|
|
|
|
static void
|
|
sev_launch_finish(SevGuestState *sev)
|
|
{
|
|
int ret, error;
|
|
Error *local_err = NULL;
|
|
|
|
trace_kvm_sev_launch_finish();
|
|
ret = sev_ioctl(sev->sev_fd, KVM_SEV_LAUNCH_FINISH, 0, &error);
|
|
if (ret) {
|
|
error_report("%s: LAUNCH_FINISH ret=%d fw_error=%d '%s'",
|
|
__func__, ret, error, fw_error_to_str(error));
|
|
exit(1);
|
|
}
|
|
|
|
sev_set_guest_state(sev, SEV_STATE_RUNNING);
|
|
|
|
/* add migration blocker */
|
|
error_setg(&sev_mig_blocker,
|
|
"SEV: Migration is not implemented");
|
|
ret = migrate_add_blocker(sev_mig_blocker, &local_err);
|
|
if (local_err) {
|
|
error_report_err(local_err);
|
|
error_free(sev_mig_blocker);
|
|
exit(1);
|
|
}
|
|
}
|
|
|
|
static void
|
|
sev_vm_state_change(void *opaque, int running, RunState state)
|
|
{
|
|
SevGuestState *sev = opaque;
|
|
|
|
if (running) {
|
|
if (!sev_check_state(sev, SEV_STATE_RUNNING)) {
|
|
sev_launch_finish(sev);
|
|
}
|
|
}
|
|
}
|
|
|
|
void *
|
|
sev_guest_init(const char *id)
|
|
{
|
|
SevGuestState *sev;
|
|
char *devname;
|
|
int ret, fw_error;
|
|
uint32_t ebx;
|
|
uint32_t host_cbitpos;
|
|
struct sev_user_data_status status = {};
|
|
|
|
ret = ram_block_discard_disable(true);
|
|
if (ret) {
|
|
error_report("%s: cannot disable RAM discard", __func__);
|
|
return NULL;
|
|
}
|
|
|
|
sev = lookup_sev_guest_info(id);
|
|
if (!sev) {
|
|
error_report("%s: '%s' is not a valid '%s' object",
|
|
__func__, id, TYPE_SEV_GUEST);
|
|
goto err;
|
|
}
|
|
|
|
sev_guest = sev;
|
|
sev->state = SEV_STATE_UNINIT;
|
|
|
|
host_cpuid(0x8000001F, 0, NULL, &ebx, NULL, NULL);
|
|
host_cbitpos = ebx & 0x3f;
|
|
|
|
if (host_cbitpos != sev->cbitpos) {
|
|
error_report("%s: cbitpos check failed, host '%d' requested '%d'",
|
|
__func__, host_cbitpos, sev->cbitpos);
|
|
goto err;
|
|
}
|
|
|
|
if (sev->reduced_phys_bits < 1) {
|
|
error_report("%s: reduced_phys_bits check failed, it should be >=1,"
|
|
" requested '%d'", __func__, sev->reduced_phys_bits);
|
|
goto err;
|
|
}
|
|
|
|
sev->me_mask = ~(1UL << sev->cbitpos);
|
|
|
|
devname = object_property_get_str(OBJECT(sev), "sev-device", NULL);
|
|
sev->sev_fd = open(devname, O_RDWR);
|
|
if (sev->sev_fd < 0) {
|
|
error_report("%s: Failed to open %s '%s'", __func__,
|
|
devname, strerror(errno));
|
|
}
|
|
g_free(devname);
|
|
if (sev->sev_fd < 0) {
|
|
goto err;
|
|
}
|
|
|
|
ret = sev_platform_ioctl(sev->sev_fd, SEV_PLATFORM_STATUS, &status,
|
|
&fw_error);
|
|
if (ret) {
|
|
error_report("%s: failed to get platform status ret=%d "
|
|
"fw_error='%d: %s'", __func__, ret, fw_error,
|
|
fw_error_to_str(fw_error));
|
|
goto err;
|
|
}
|
|
sev->build_id = status.build;
|
|
sev->api_major = status.api_major;
|
|
sev->api_minor = status.api_minor;
|
|
|
|
trace_kvm_sev_init();
|
|
ret = sev_ioctl(sev->sev_fd, KVM_SEV_INIT, NULL, &fw_error);
|
|
if (ret) {
|
|
error_report("%s: failed to initialize ret=%d fw_error=%d '%s'",
|
|
__func__, ret, fw_error, fw_error_to_str(fw_error));
|
|
goto err;
|
|
}
|
|
|
|
ret = sev_launch_start(sev);
|
|
if (ret) {
|
|
error_report("%s: failed to create encryption context", __func__);
|
|
goto err;
|
|
}
|
|
|
|
ram_block_notifier_add(&sev_ram_notifier);
|
|
qemu_add_machine_init_done_notifier(&sev_machine_done_notify);
|
|
qemu_add_vm_change_state_handler(sev_vm_state_change, sev);
|
|
|
|
return sev;
|
|
err:
|
|
sev_guest = NULL;
|
|
ram_block_discard_disable(false);
|
|
return NULL;
|
|
}
|
|
|
|
int
|
|
sev_encrypt_data(void *handle, uint8_t *ptr, uint64_t len)
|
|
{
|
|
SevGuestState *sev = handle;
|
|
|
|
assert(sev);
|
|
|
|
/* if SEV is in update state then encrypt the data else do nothing */
|
|
if (sev_check_state(sev, SEV_STATE_LAUNCH_UPDATE)) {
|
|
return sev_launch_update_data(sev, ptr, len);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
sev_register_types(void)
|
|
{
|
|
type_register_static(&sev_guest_info);
|
|
}
|
|
|
|
type_init(sev_register_types);
|