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kvm: factor out kvm_has_msr_star

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And add kvm_has_msr_hsave_pa(), to avoid warnings on older
kernels without support.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Marcelo Tosatti 2010-10-21 13:35:02 -02:00
parent aa851e365b
commit 75b10c4336
1 changed files with 30 additions and 11 deletions
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41
target-i386/kvm.c
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@ -438,23 +438,26 @@ void kvm_arch_reset_vcpu(CPUState *env)
}
}
static int kvm_has_msr_star(CPUState *env)
int has_msr_star;
int has_msr_hsave_pa;
static void kvm_supported_msrs(CPUState *env)
{
static int has_msr_star;
static int kvm_supported_msrs;
int ret;
/* first time */
if (has_msr_star == 0) {
if (kvm_supported_msrs == 0) {
struct kvm_msr_list msr_list, *kvm_msr_list;
has_msr_star = -1;
kvm_supported_msrs = -1;
/* Obtain MSR list from KVM. These are the MSRs that we must
* save/restore */
msr_list.nmsrs = 0;
ret = kvm_ioctl(env->kvm_state, KVM_GET_MSR_INDEX_LIST, &msr_list);
if (ret < 0 && ret != -E2BIG) {
return 0;
return;
}
/* Old kernel modules had a bug and could write beyond the provided
memory. Allocate at least a safe amount of 1K. */
@ -470,7 +473,11 @@ static int kvm_has_msr_star(CPUState *env)
for (i = 0; i < kvm_msr_list->nmsrs; i++) {
if (kvm_msr_list->indices[i] == MSR_STAR) {
has_msr_star = 1;
break;
continue;
}
if (kvm_msr_list->indices[i] == MSR_VM_HSAVE_PA) {
has_msr_hsave_pa = 1;
continue;
}
}
}
@ -478,9 +485,19 @@ static int kvm_has_msr_star(CPUState *env)
free(kvm_msr_list);
}
if (has_msr_star == 1)
return 1;
return 0;
return;
}
static int kvm_has_msr_hsave_pa(CPUState *env)
{
kvm_supported_msrs(env);
return has_msr_hsave_pa;
}
static int kvm_has_msr_star(CPUState *env)
{
kvm_supported_msrs(env);
return has_msr_star;
}
static int kvm_init_identity_map_page(KVMState *s)
@ -790,7 +807,8 @@ static int kvm_put_msrs(CPUState *env, int level)
kvm_msr_entry_set(&msrs[n++], MSR_IA32_SYSENTER_EIP, env->sysenter_eip);
if (kvm_has_msr_star(env))
kvm_msr_entry_set(&msrs[n++], MSR_STAR, env->star);
kvm_msr_entry_set(&msrs[n++], MSR_VM_HSAVE_PA, env->vm_hsave);
if (kvm_has_msr_hsave_pa(env))
kvm_msr_entry_set(&msrs[n++], MSR_VM_HSAVE_PA, env->vm_hsave);
#ifdef TARGET_X86_64
/* FIXME if lm capable */
kvm_msr_entry_set(&msrs[n++], MSR_CSTAR, env->cstar);
@ -1016,7 +1034,8 @@ static int kvm_get_msrs(CPUState *env)
msrs[n++].index = MSR_IA32_SYSENTER_EIP;
if (kvm_has_msr_star(env))
msrs[n++].index = MSR_STAR;
msrs[n++].index = MSR_VM_HSAVE_PA;
if (kvm_has_msr_hsave_pa(env))
msrs[n++].index = MSR_VM_HSAVE_PA;
msrs[n++].index = MSR_IA32_TSC;
#ifdef TARGET_X86_64
/* FIXME lm_capable_kernel */