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kvm: x86: Only read/write MSR_KVM_ASYNC_PF_EN if supported

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If the kernel does not support KVM_CAP_ASYNC_PF, it also does not know
about the related MSR. So skip it during state synchronization in that
case. Fixes annoying kernel warnings.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Jan Kiszka 2011-01-21 21:48:22 +01:00 committed by Marcelo Tosatti
parent d8f771d912
commit c5999bfcfd
1 changed files with 11 additions and 2 deletions
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13
target-i386/kvm.c
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@ -63,6 +63,9 @@ const KVMCapabilityInfo kvm_arch_required_capabilities[] = {
static bool has_msr_star;
static bool has_msr_hsave_pa;
#if defined(CONFIG_KVM_PARA) && defined(KVM_CAP_ASYNC_PF)
static bool has_msr_async_pf_en;
#endif
static int lm_capable_kernel;
static struct kvm_cpuid2 *try_get_cpuid(KVMState *s, int max)
@ -164,6 +167,7 @@ static int get_para_features(CPUState *env)
features |= (1 << para_features[i].feature);
}
}
has_msr_async_pf_en = features & (1 << KVM_FEATURE_ASYNC_PF);
return features;
}
#endif
@ -828,7 +832,10 @@ static int kvm_put_msrs(CPUState *env, int level)
env->system_time_msr);
kvm_msr_entry_set(&msrs[n++], MSR_KVM_WALL_CLOCK, env->wall_clock_msr);
#if defined(CONFIG_KVM_PARA) && defined(KVM_CAP_ASYNC_PF)
kvm_msr_entry_set(&msrs[n++], MSR_KVM_ASYNC_PF_EN, env->async_pf_en_msr);
if (has_msr_async_pf_en) {
kvm_msr_entry_set(&msrs[n++], MSR_KVM_ASYNC_PF_EN,
env->async_pf_en_msr);
}
#endif
}
#ifdef KVM_CAP_MCE
@ -1064,7 +1071,9 @@ static int kvm_get_msrs(CPUState *env)
msrs[n++].index = MSR_KVM_SYSTEM_TIME;
msrs[n++].index = MSR_KVM_WALL_CLOCK;
#if defined(CONFIG_KVM_PARA) && defined(KVM_CAP_ASYNC_PF)
msrs[n++].index = MSR_KVM_ASYNC_PF_EN;
if (has_msr_async_pf_en) {
msrs[n++].index = MSR_KVM_ASYNC_PF_EN;
}
#endif
#ifdef KVM_CAP_MCE