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x86/kvm/nVMX: allow bare VMXON state migration

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commit a1b0c1c64d upstream.

It is perfectly valid for a guest to do VMXON and not do VMPTRLD. This
state needs to be preserved on migration.

Cc: stable@vger.kernel.org
Fixes: 8fcc4b5923
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Vitaly Kuznetsov
2018-10-16 18:50:07 +02:00
committed by Greg Kroah-Hartman
parent 967afd9a74
commit 97dc505190
1 changed files with 8 additions and 7 deletions
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15
arch/x86/kvm/vmx.c
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@@ -14010,13 +14010,6 @@ static int vmx_set_nested_state(struct kvm_vcpu *vcpu,
if (!page_address_valid(vcpu, kvm_state->vmx.vmxon_pa))
return -EINVAL;
if (kvm_state->size < sizeof(kvm_state) + sizeof(*vmcs12))
return -EINVAL;
if (kvm_state->vmx.vmcs_pa == kvm_state->vmx.vmxon_pa ||
!page_address_valid(vcpu, kvm_state->vmx.vmcs_pa))
return -EINVAL;
if ((kvm_state->vmx.smm.flags & KVM_STATE_NESTED_SMM_GUEST_MODE) &&
(kvm_state->flags & KVM_STATE_NESTED_GUEST_MODE))
return -EINVAL;
@@ -14046,6 +14039,14 @@ static int vmx_set_nested_state(struct kvm_vcpu *vcpu,
if (ret)
return ret;
/* Empty 'VMXON' state is permitted */
if (kvm_state->size < sizeof(kvm_state) + sizeof(*vmcs12))
return 0;
if (kvm_state->vmx.vmcs_pa == kvm_state->vmx.vmxon_pa ||
!page_address_valid(vcpu, kvm_state->vmx.vmcs_pa))
return -EINVAL;
set_current_vmptr(vmx, kvm_state->vmx.vmcs_pa);
if (kvm_state->vmx.smm.flags & KVM_STATE_NESTED_SMM_VMXON) {