linux-kernel - [PATCH v4] KVM: emulate: Don't inject #GP when emulating RDMPC if CR0.PE=0

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Date:   Wed, 20 Oct 2021 01:52:31 -0700
From:   Wanpeng Li <kernellwp@...il.com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>
Subject: [PATCH v4] KVM: emulate: Don't inject #GP when emulating RDMPC if CR0.PE=0

From: Wanpeng Li <wanpengli@...cent.com>

SDM mentioned that we should #GP for rdpmc if ECX is not valid or 
(CR4.PCE is 0 and CPL is 1, 2, or 3 and CR0.PE is 1).

Let's add the CR0.PE is 1 checking to rdpmc emulate, though this isn't
strictly necessary since it's impossible for CPL to be >0 if CR0.PE=0.

Reviewed-by: Sean Christopherson <seanjc@...gle.com>
Signed-off-by: Wanpeng Li <wanpengli@...cent.com>
---
v3 -> v4:
 * add comments instead of pseudocode
v2 -> v3:
 * add the missing 'S'
v1 -> v2:
 * update patch description

 arch/x86/kvm/emulate.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 9a144ca8e146..ab7ec569e8c9 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -4213,6 +4213,7 @@ static int check_rdtsc(struct x86_emulate_ctxt *ctxt)
 static int check_rdpmc(struct x86_emulate_ctxt *ctxt)
 {
 	u64 cr4 = ctxt->ops->get_cr(ctxt, 4);
+	u64 cr0 = ctxt->ops->get_cr(ctxt, 0);
 	u64 rcx = reg_read(ctxt, VCPU_REGS_RCX);
 
 	/*
@@ -4222,7 +4223,7 @@ static int check_rdpmc(struct x86_emulate_ctxt *ctxt)
 	if (enable_vmware_backdoor && is_vmware_backdoor_pmc(rcx))
 		return X86EMUL_CONTINUE;
 
-	if ((!(cr4 & X86_CR4_PCE) && ctxt->ops->cpl(ctxt)) ||
+	if ((!(cr4 & X86_CR4_PCE) && ctxt->ops->cpl(ctxt) && (cr0 & X86_CR0_PE)) ||
 	    ctxt->ops->check_pmc(ctxt, rcx))
 		return emulate_gp(ctxt, 0);
 
-- 
2.25.1