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* [PATCH] kvm: fix wrong exception emulation in check_rdtsc
@ 2021-08-18  3:36 Hou Wenlong
  2021-08-18 21:07 ` Jim Mattson
                   ` (2 more replies)
  0 siblings, 3 replies; 4+ messages in thread
From: Hou Wenlong @ 2021-08-18  3:36 UTC (permalink / raw)
  To: kvm
  Cc: Paolo Bonzini, Sean Christopherson, Vitaly Kuznetsov, Wanpeng Li,
	Jim Mattson, Joerg Roedel, Thomas Gleixner, Ingo Molnar,
	Borislav Petkov, x86, H. Peter Anvin, Avi Kivity, linux-kernel

According to Intel's SDM Vol2 and AMD's APM Vol3, when
CR4.TSD is set, use rdtsc/rdtscp instruction above privilege
level 0 should trigger a #GP.

Fixes: d7eb82030699e ("KVM: SVM: Add intercept checks for remaining group7 instructions")
Signed-off-by: Hou Wenlong <houwenlong93@linux.alibaba.com>
---
 arch/x86/kvm/emulate.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 2837110e66ed..c589ac832265 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -4206,7 +4206,7 @@ static int check_rdtsc(struct x86_emulate_ctxt *ctxt)
 	u64 cr4 = ctxt->ops->get_cr(ctxt, 4);
 
 	if (cr4 & X86_CR4_TSD && ctxt->ops->cpl(ctxt))
-		return emulate_ud(ctxt);
+		return emulate_gp(ctxt, 0);
 
 	return X86EMUL_CONTINUE;
 }
-- 
2.31.1


^ permalink raw reply	[flat|nested] 4+ messages in thread

end of thread, other threads:[~2021-09-21 18:01 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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2021-08-18  3:36 [PATCH] kvm: fix wrong exception emulation in check_rdtsc Hou Wenlong
2021-08-18 21:07 ` Jim Mattson
2021-08-18 21:43 ` Sean Christopherson
2021-09-21 18:00 ` Paolo Bonzini

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