lkml.org 
[lkml]   [2015]   [Feb]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Subject[PATCH] x86: svm: make wbinvd faster
From
Date
From: David Kaplan <David.Kaplan@amd.com>
No need to re-decode WBINVD since we know what it is from the intercept.

Signed-off-by: David Kaplan <David.Kaplan@amd.com>
[extracted from larger unlrelated patch, forward ported, tested]
Signed-off-by: Joel Schopp <joel.schopp@amd.com>
---
arch/x86/kvm/svm.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index d319e0c..86ecd21 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -2776,6 +2776,14 @@ static int skinit_interception(struct vcpu_svm *svm)
return 1;
}

+static int wbinvd_interception(struct vcpu_svm *svm)
+{
+ kvm_emulate_wbinvd(&svm->vcpu);
+ skip_emulated_instruction(&svm->vcpu);
+ return 1;
+}
+
+
static int xsetbv_interception(struct vcpu_svm *svm)
{
u64 new_bv = kvm_read_edx_eax(&svm->vcpu);
@@ -3376,7 +3384,7 @@ static int (*const svm_exit_handlers[])(struct vcpu_svm *svm) = {
[SVM_EXIT_STGI] = stgi_interception,
[SVM_EXIT_CLGI] = clgi_interception,
[SVM_EXIT_SKINIT] = skinit_interception,
- [SVM_EXIT_WBINVD] = emulate_on_interception,
+ [SVM_EXIT_WBINVD] = wbinvd_interception,
[SVM_EXIT_MONITOR] = monitor_interception,
[SVM_EXIT_MWAIT] = mwait_interception,
[SVM_EXIT_XSETBV] = xsetbv_interception,


\
 
 \ /
  Last update: 2015-02-28 01:21    [W:0.093 / U:0.452 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site