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From: Sean Christopherson <sean.j.christopherson@intel.com>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: Sean Christopherson <sean.j.christopherson@intel.com>,
	Vitaly Kuznetsov <vkuznets@redhat.com>,
	Wanpeng Li <wanpengli@tencent.com>,
	Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
	kvm@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH 1/3] KVM: VMX: Use precomputed MAXPHYADDR for RTIT base MSR check
Date: Wed, 15 Jul 2020 20:44:06 -0700	[thread overview]
Message-ID: <20200716034408.6342-2-sean.j.christopherson@intel.com> (raw)
In-Reply-To: <20200716034408.6342-1-sean.j.christopherson@intel.com>

Use cpuid_maxphyaddr() instead of cpuid_query_maxphyaddr() for the
RTIT base MSR check.  There is no reason to recompute MAXPHYADDR as the
precomputed version is synchronized with CPUID updates, and
MSR_IA32_RTIT_OUTPUT_BASE is not written between stuffing CPUID and
refreshing vcpu->arch.maxphyaddr.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 arch/x86/kvm/vmx/vmx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 1bb59ae5016dc..50b7e85d37352 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -146,7 +146,7 @@ module_param_named(preemption_timer, enable_preemption_timer, bool, S_IRUGO);
 	RTIT_STATUS_BYTECNT))
 
 #define MSR_IA32_RTIT_OUTPUT_BASE_MASK \
-	(~((1UL << cpuid_query_maxphyaddr(vcpu)) - 1) | 0x7f)
+	(~((1UL << cpuid_maxphyaddr(vcpu)) - 1) | 0x7f)
 
 /*
  * These 2 parameters are used to config the controls for Pause-Loop Exiting:
-- 
2.26.0


  reply	other threads:[~2020-07-16  3:44 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-16  3:44 [PATCH 0/3] KVM: VMX: Clean up RTIT MAXPHYADDR usage Sean Christopherson
2020-07-16  3:44 ` Sean Christopherson [this message]
2020-07-16  3:44 ` [PATCH 2/3] KVM: VMX: Replace MSR_IA32_RTIT_OUTPUT_BASE_MASK with helper function Sean Christopherson
2020-07-16  3:44 ` [PATCH 3/3] KVM: x86: Unexport cpuid_query_maxphyaddr() Sean Christopherson

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