linux-kernel - [PATCH v2 5/5] KVM: VMX: Switch PEBS records output to Intel PT buffer

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Date:   Thu, 19 Mar 2020 22:33:50 +0800
From:   Luwei Kang <luwei.kang@...el.com>
To:     x86@...nel.org, linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
        mark.rutland@....com, alexander.shishkin@...ux.intel.com,
        jolsa@...hat.com, namhyung@...nel.org, tglx@...utronix.de,
        bp@...en8.de, hpa@...or.com, pbonzini@...hat.com,
        sean.j.christopherson@...el.com, vkuznets@...hat.com,
        wanpengli@...cent.com, jmattson@...gle.com, joro@...tes.org,
        pawan.kumar.gupta@...ux.intel.com, ak@...ux.intel.com,
        thomas.lendacky@....com, fenghua.yu@...el.com,
        kan.liang@...ux.intel.com, Luwei Kang <luwei.kang@...el.com>
Subject: [PATCH v2 5/5] KVM: VMX: Switch PEBS records output to Intel PT buffer

Switch PEBS records output to Intel PT buffer when PEBS is enabled
in KVM guest by Intel PT.

Signed-off-by: Luwei Kang <luwei.kang@...el.com>
---
 arch/x86/kvm/vmx/vmx.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index c6d9a87..ec74656 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -921,6 +921,7 @@ void add_atomic_switch_msr(struct vcpu_vmx *vmx, unsigned msr,
 {
 	int i, j = 0;
 	struct msr_autoload *m = &vmx->msr_autoload;
+	struct kvm_pmu *pmu = vcpu_to_pmu(&vmx->vcpu);
 
 	switch (msr) {
 	case MSR_EFER:
@@ -952,6 +953,8 @@ void add_atomic_switch_msr(struct vcpu_vmx *vmx, unsigned msr,
 		 * guest's memory.
 		 */
 		wrmsrl(MSR_IA32_PEBS_ENABLE, 0);
+		if ((pmu->pebs_enable & PEBS_OUTPUT_MASK) == PEBS_OUTPUT_PT)
+			guest_val |= PEBS_OUTPUT_PT;
 	}
 
 	i = vmx_find_msr_index(&m->guest, msr);
-- 
1.8.3.1