This is a note to let you know that I've just added the patch titled
kvm: nVMX: VMCLEAR should not cause the vCPU to shut down
to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
kvm-nvmx-vmclear-should-not-cause-the-vcpu-to-shut-down.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Tue Dec 12 13:26:17 CET 2017
From: Jim Mattson <jmattson@xxxxxxxxxx>
Date: Thu, 2 Mar 2017 12:41:48 -0800
Subject: kvm: nVMX: VMCLEAR should not cause the vCPU to shut down
From: Jim Mattson <jmattson@xxxxxxxxxx>
[ Upstream commit 587d7e72aedca91cee80c0a56811649c3efab765 ]
VMCLEAR should silently ignore a failure to clear the launch state of
the VMCS referenced by the operand.
Signed-off-by: Jim Mattson <jmattson@xxxxxxxxxx>
[Changed "kvm_write_guest(vcpu->kvm" to "kvm_vcpu_write_guest(vcpu".]
Signed-off-by: Radim Krčmář <rkrcmar@xxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/x86/kvm/vmx.c | 22 ++++------------------
1 file changed, 4 insertions(+), 18 deletions(-)
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -7203,9 +7203,8 @@ static int handle_vmoff(struct kvm_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;
@@ -7216,22 +7215,9 @@ static int handle_vmclear(struct kvm_vcp
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);
Patches currently in stable-queue which might be from jmattson@xxxxxxxxxx are
queue-4.9/kvm-nvmx-reset-nested_run_pending-if-the-vcpu-is-going-to-be-reset.patch
queue-4.9/kvm-nvmx-vmclear-should-not-cause-the-vcpu-to-shut-down.patch
queue-4.9/kvm-vmx-remove-i-o-port-0x80-bypass-on-intel-hosts.patch