haraldwolff/qemu-patch-raspberry4
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PPC: KVM: set has-idle in guest device tree

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On e500mc, the platform doesn't provide a way for the CPU to go idle.

To still not uselessly burn CPU time, expose an idle hypercall to the guest
if kvm supports it.

Signed-off-by: Stuart Yoder <stuart.yoder@freescale.com>
[agraf: adjust for current code base, add patch description, fix non-kvm case]
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Stuart Yoder 2013-01-03 12:37:02 +00:00 committed by Alexander Graf
parent d4834ff9b7
commit 1a61a9ae61
3 changed files with 39 additions and 9 deletions
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4
hw/ppc/e500.c
View file

@ -225,6 +225,10 @@ static int ppce500_load_device_tree(CPUPPCState *env,
kvmppc_get_hypercall(env, hypercall, sizeof(hypercall));
qemu_devtree_setprop(fdt, "/hypervisor", "hcall-instructions",
hypercall, sizeof(hypercall));
/* if KVM supports the idle hcall, set property indicating this */
if (kvmppc_get_hasidle(env)) {
qemu_devtree_setprop(fdt, "/hypervisor", "has-idle", NULL, 0);
}
}
/* Create CPU nodes */

38
target-ppc/kvm.c
View file

@ -989,18 +989,38 @@ uint32_t kvmppc_get_dfp(void)
return kvmppc_read_int_cpu_dt("ibm,dfp");
}
int kvmppc_get_hypercall(CPUPPCState *env, uint8_t *buf, int buf_len)
{
PowerPCCPU *cpu = ppc_env_get_cpu(env);
CPUState *cs = CPU(cpu);
uint32_t *hc = (uint32_t*)buf;
struct kvm_ppc_pvinfo pvinfo;
static int kvmppc_get_pvinfo(CPUPPCState *env, struct kvm_ppc_pvinfo *pvinfo)
{
PowerPCCPU *cpu = ppc_env_get_cpu(env);
CPUState *cs = CPU(cpu);
if (kvm_check_extension(cs->kvm_state, KVM_CAP_PPC_GET_PVINFO) &&
!kvm_vm_ioctl(cs->kvm_state, KVM_PPC_GET_PVINFO, &pvinfo)) {
memcpy(buf, pvinfo.hcall, buf_len);
!kvm_vm_ioctl(cs->kvm_state, KVM_PPC_GET_PVINFO, pvinfo)) {
return 0;
}
return 1;
}
int kvmppc_get_hasidle(CPUPPCState *env)
{
struct kvm_ppc_pvinfo pvinfo;
if (!kvmppc_get_pvinfo(env, &pvinfo) &&
(pvinfo.flags & KVM_PPC_PVINFO_FLAGS_EV_IDLE)) {
return 1;
}
return 0;
}
int kvmppc_get_hypercall(CPUPPCState *env, uint8_t *buf, int buf_len)
{
uint32_t *hc = (uint32_t*)buf;
struct kvm_ppc_pvinfo pvinfo;
if (!kvmppc_get_pvinfo(env, &pvinfo)) {
memcpy(buf, pvinfo.hcall, buf_len);
return 0;
}

6
target-ppc/kvm_ppc.h
View file

@ -19,6 +19,7 @@ uint32_t kvmppc_get_tbfreq(void);
uint64_t kvmppc_get_clockfreq(void);
uint32_t kvmppc_get_vmx(void);
uint32_t kvmppc_get_dfp(void);
int kvmppc_get_hasidle(CPUPPCState *env);
int kvmppc_get_hypercall(CPUPPCState *env, uint8_t *buf, int buf_len);
int kvmppc_set_interrupt(PowerPCCPU *cpu, int irq, int level);
void kvmppc_set_papr(PowerPCCPU *cpu);
@ -55,6 +56,11 @@ static inline uint32_t kvmppc_get_dfp(void)
return 0;
}
static inline int kvmppc_get_hasidle(CPUPPCState *env)
{
return 0;
}
static inline int kvmppc_get_hypercall(CPUPPCState *env, uint8_t *buf, int buf_len)
{
return -1;