lkml.org 
[lkml]   [2017]   [Oct]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 9/9] KVM: x86: Disable intercept for Intel processor trace MSRs
Date
From: Chao Peng <chao.p.peng@linux.intel.com>

Trap for Intel processor trace is none sense. Pass through to
guest directly.

Signed-off-by: Chao Peng <chao.p.peng@linux.intel.com>
Signed-off-by: Luwei Kang <luwei.kang@intel.com>
---
arch/x86/kvm/vmx.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 3c9ce3e..58606ce 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -7076,6 +7076,20 @@ static __init int hardware_setup(void)
if (pt_mode == PT_MODE_GUEST)
pt_register_virt_ops(&pt_virt_ops);

+ if (pt_mode == PT_MODE_GUEST || pt_mode == PT_MODE_HOST_GUEST) {
+ u32 i, eax, ebx, ecx, edx;
+
+ cpuid_count(0x14, 1, &eax, &ebx, &ecx, &edx);
+ vmx_disable_intercept_for_msr(MSR_IA32_RTIT_CTL, false);
+ vmx_disable_intercept_for_msr(MSR_IA32_RTIT_STATUS, false);
+ vmx_disable_intercept_for_msr(MSR_IA32_RTIT_OUTPUT_BASE, false);
+ vmx_disable_intercept_for_msr(MSR_IA32_RTIT_OUTPUT_MASK, false);
+ vmx_disable_intercept_for_msr(MSR_IA32_RTIT_CR3_MATCH, false);
+ for (i = 0; i < (eax & 0x7); i++)
+ vmx_disable_intercept_for_msr(MSR_IA32_RTIT_ADDR0_A + i,
+ false);
+ }
+
return alloc_kvm_area();

out:
--
1.8.3.1
\
 
 \ /
  Last update: 2017-10-17 03:58    [W:0.088 / U:1.336 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site