From: Sean Christopherson <seanjc@google.com>
To: Wanpeng Li <kernellwp@gmail.com>
Cc: linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
Paolo Bonzini <pbonzini@redhat.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Wanpeng Li <wanpengli@tencent.com>,
Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>
Subject: Re: [PATCH v2 1/3] KVM: emulate: Don't inject #GP when emulating RDMPC if CR0.PE=0
Date: Fri, 15 Oct 2021 23:20:38 +0000 [thread overview]
Message-ID: <YWoMxmq+RZ5je9Sy@google.com> (raw)
In-Reply-To: <1633770532-23664-1-git-send-email-wanpengli@tencent.com>
On Sat, Oct 09, 2021, Wanpeng Li wrote:
> From: Wanpeng Li <wanpengli@tencent.com>
>
> DM mentioned that, RDPMC:
Heh, missing 'S' in "SDM".
>
> IF (((CR4.PCE = 1) or (CPL = 0) or (CR0.PE = 0)) and (ECX indicates a supported counter))
> THEN
> EAX := counter[31:0];
> EDX := ZeroExtend(counter[MSCB:32]);
> ELSE (* ECX is not valid or CR4.PCE is 0 and CPL is 1, 2, or 3 and CR0.PE is 1 *)
> #GP(0);
> FI;
>
> 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.
>
> Signed-off-by: Wanpeng Li <wanpengli@tencent.com>
> ---
Reviewed-by: Sean Christopherson <seanjc@google.com>
prev parent reply other threads:[~2021-10-15 23:20 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-09 9:08 [PATCH v2 1/3] KVM: emulate: Don't inject #GP when emulating RDMPC if CR0.PE=0 Wanpeng Li
2021-10-09 9:08 ` [PATCH v2 2/3] KVM: vPMU: Fill get_msr MSR_CORE_PERF_GLOBAL_OVF_CTRL w/ 0 Wanpeng Li
2021-10-09 9:08 ` [PATCH v2 3/3] KVM: vCPU kick tax cut for running vCPU Wanpeng Li
2021-10-15 23:26 ` Sean Christopherson
2021-10-16 2:48 ` Wanpeng Li
2021-10-15 23:20 ` Sean Christopherson [this message]
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