lkml.org 
[lkml]   [2021]   [Apr]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH RFC 06/22] KVM: x86: hyper-v: Honor HV_MSR_VP_INDEX_AVAILABLE privilege bit
Date
HV_X64_MSR_VP_INDEX is only available to guest when
HV_MSR_VP_INDEX_AVAILABLE bit is exposed.

Note, writing to HV_X64_MSR_VP_INDEX is only available from the host so
kvm_hv_set_msr() doesn't need an additional check.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
---
arch/x86/kvm/hyperv.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c
index 7fdd9b9c50d6..07f1fc8575e5 100644
--- a/arch/x86/kvm/hyperv.c
+++ b/arch/x86/kvm/hyperv.c
@@ -1514,6 +1514,10 @@ static int kvm_hv_get_msr(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata,

switch (msr) {
case HV_X64_MSR_VP_INDEX:
+ if (unlikely(!host && !(hv_vcpu->cpuid_cache.features_eax &
+ HV_MSR_VP_INDEX_AVAILABLE)))
+ return 1;
+
data = hv_vcpu->vp_index;
break;
case HV_X64_MSR_EOI:
--
2.30.2
\
 
 \ /
  Last update: 2021-04-13 14:29    [W:0.189 / U:0.200 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site