public inbox for kvm@vger.kernel.org
 help / color / mirror / Atom feed
From: Jim Mattson <jmattson@google.com>
To: kvm@vger.kernel.org
Cc: Jim Mattson <jmattson@google.com>
Subject: [PATCH] KVM: nVMX: Don't update vmcs12->xss_exit_bitmap on nested VM-exit
Date: Thu,  1 Jun 2017 12:43:37 -0700	[thread overview]
Message-ID: <20170601194337.187891-1-jmattson@google.com> (raw)

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

             reply	other threads:[~2017-06-01 19:44 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-06-01 19:43 Jim Mattson [this message]
2017-06-07 14:41 ` [PATCH] KVM: nVMX: Don't update vmcs12->xss_exit_bitmap on nested VM-exit Radim Krčmář

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20170601194337.187891-1-jmattson@google.com \
    --to=jmattson@google.com \
    --cc=kvm@vger.kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox