* [PATCH] KVM: nVMX: Don't update vmcs12->xss_exit_bitmap on nested VM-exit
@ 2017-06-01 19:43 Jim Mattson
2017-06-07 14:41 ` Radim Krčmář
0 siblings, 1 reply; 2+ messages in thread
From: Jim Mattson @ 2017-06-01 19:43 UTC (permalink / raw)
To: kvm; +Cc: Jim Mattson
The XSS-exiting bitmap is a VMCS control field that does not change
while the CPU is in non-root mode. Transferring the unchanged value
from vmcs02 to vmcs12 is unnecessary.
Signed-off-by: Jim Mattson <jmattson@google.com>
---
arch/x86/kvm/vmx.c | 2 --
1 file changed, 2 deletions(-)
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 60fa010d3fa1..c12336087850 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -10736,8 +10736,6 @@ static void sync_vmcs12(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12)
vmcs12->guest_sysenter_eip = vmcs_readl(GUEST_SYSENTER_EIP);
if (kvm_mpx_supported())
vmcs12->guest_bndcfgs = vmcs_read64(GUEST_BNDCFGS);
- if (nested_cpu_has_xsaves(vmcs12))
- vmcs12->xss_exit_bitmap = vmcs_read64(XSS_EXIT_BITMAP);
}
/*
--
2.13.0.219.gdb65acc882-goog
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] KVM: nVMX: Don't update vmcs12->xss_exit_bitmap on nested VM-exit
2017-06-01 19:43 [PATCH] KVM: nVMX: Don't update vmcs12->xss_exit_bitmap on nested VM-exit Jim Mattson
@ 2017-06-07 14:41 ` Radim Krčmář
0 siblings, 0 replies; 2+ messages in thread
From: Radim Krčmář @ 2017-06-07 14:41 UTC (permalink / raw)
To: Jim Mattson; +Cc: kvm
2017-06-01 12:43-0700, Jim Mattson:
> The XSS-exiting bitmap is a VMCS control field that does not change
> while the CPU is in non-root mode. Transferring the unchanged value
> from vmcs02 to vmcs12 is unnecessary.
>
> Signed-off-by: Jim Mattson <jmattson@google.com>
> ---
Queued, thanks.
^ permalink raw reply [flat|nested] 2+ messages in thread
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2017-06-01 19:43 [PATCH] KVM: nVMX: Don't update vmcs12->xss_exit_bitmap on nested VM-exit Jim Mattson
2017-06-07 14:41 ` Radim Krčmář
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