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kvm: nVMX: VMCLEAR should not cause the vCPU to shut down

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[ Upstream commit 587d7e72ae ]

VMCLEAR should silently ignore a failure to clear the launch state of
the VMCS referenced by the operand.

Signed-off-by: Jim Mattson <jmattson@google.com>
[Changed "kvm_write_guest(vcpu->kvm" to "kvm_vcpu_write_guest(vcpu".]
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>

Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jim Mattson
2017-03-02 12:41:48 -08:00
committed by Greg Kroah-Hartman
parent ef21f3a12b
commit f9b291aed2
1 changed files with 4 additions and 18 deletions
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22
arch/x86/kvm/vmx.c
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@@ -6924,9 +6924,8 @@ static int handle_vmoff(struct kvm_vcpu *vcpu)
static int handle_vmclear(struct kvm_vcpu *vcpu)
{
struct vcpu_vmx *vmx = to_vmx(vcpu);
u32 zero = 0;
gpa_t vmptr;
struct vmcs12 *vmcs12;
struct page *page;
if (!nested_vmx_check_permission(vcpu))
return 1;
@@ -6937,22 +6936,9 @@ static int handle_vmclear(struct kvm_vcpu *vcpu)
if (vmptr == vmx->nested.current_vmptr)
nested_release_vmcs12(vmx);
page = nested_get_page(vcpu, vmptr);
if (page == NULL) {
/*
* For accurate processor emulation, VMCLEAR beyond available
* physical memory should do nothing at all. However, it is
* possible that a nested vmx bug, not a guest hypervisor bug,
* resulted in this case, so let's shut down before doing any
* more damage:
*/
kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);
return 1;
}
vmcs12 = kmap(page);
vmcs12->launch_state = 0;
kunmap(page);
nested_release_page(page);
kvm_vcpu_write_guest(vcpu,
vmptr + offsetof(struct vmcs12, launch_state),
&zero, sizeof(zero));
nested_free_vmcs02(vmx, vmptr);