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i386: reset KVM nested state upon CPU reset 

Make sure env->nested_state is cleaned up when a vCPU is reset, it may
be stale after an incoming migration, kvm_arch_put_registers() may
end up failing or putting vCPU in a weird state.

Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Message-Id: <20220818150113.479917-2-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Vitaly Kuznetsov 2022-08-18 17:01:12 +02:00 committed by Paolo Bonzini
parent 6d1511cea0
commit 3cafdb6750
1 changed files with 27 additions and 10 deletions
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37
target/i386/kvm/kvm.c
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@ -1695,6 +1695,30 @@ static void kvm_init_xsave(CPUX86State *env)
env->xsave_buf_len);
}
static void kvm_init_nested_state(CPUX86State *env)
{
struct kvm_vmx_nested_state_hdr *vmx_hdr;
uint32_t size;
if (!env->nested_state) {
return;
}
size = env->nested_state->size;
memset(env->nested_state, 0, size);
env->nested_state->size = size;
if (cpu_has_vmx(env)) {
env->nested_state->format = KVM_STATE_NESTED_FORMAT_VMX;
vmx_hdr = &env->nested_state->hdr.vmx;
vmx_hdr->vmxon_pa = -1ull;
vmx_hdr->vmcs12_pa = -1ull;
} else if (cpu_has_svm(env)) {
env->nested_state->format = KVM_STATE_NESTED_FORMAT_SVM;
}
}
int kvm_arch_init_vcpu(CPUState *cs)
{
struct {
@ -2122,19 +2146,10 @@ int kvm_arch_init_vcpu(CPUState *cs)
assert(max_nested_state_len >= offsetof(struct kvm_nested_state, data));
if (cpu_has_vmx(env) || cpu_has_svm(env)) {
struct kvm_vmx_nested_state_hdr *vmx_hdr;
env->nested_state = g_malloc0(max_nested_state_len);
env->nested_state->size = max_nested_state_len;
if (cpu_has_vmx(env)) {
env->nested_state->format = KVM_STATE_NESTED_FORMAT_VMX;
vmx_hdr = &env->nested_state->hdr.vmx;
vmx_hdr->vmxon_pa = -1ull;
vmx_hdr->vmcs12_pa = -1ull;
} else {
env->nested_state->format = KVM_STATE_NESTED_FORMAT_SVM;
}
kvm_init_nested_state(env);
}
}
@ -2199,6 +2214,8 @@ void kvm_arch_reset_vcpu(X86CPU *cpu)
/* enabled by default */
env->poll_control_msr = 1;
kvm_init_nested_state(env);
sev_es_set_reset_vector(CPU(cpu));
}