linux-kernel - [PATCH RESEND 25/30] KVM: x86: nSVM: support PAUSE filter threshold and count when cpu

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Date:   Mon,  7 Feb 2022 17:54:42 +0200
From:   Maxim Levitsky <mlevitsk@...hat.com>
To:     kvm@...r.kernel.org
Cc:     Tony Luck <tony.luck@...el.com>,
        "Chang S. Bae" <chang.seok.bae@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Wanpeng Li <wanpengli@...cent.com>,
        Ingo Molnar <mingo@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        linux-kernel@...r.kernel.org,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        intel-gvt-dev@...ts.freedesktop.org,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Joerg Roedel <joro@...tes.org>,
        Sean Christopherson <seanjc@...gle.com>,
        David Airlie <airlied@...ux.ie>,
        Zhi Wang <zhi.a.wang@...el.com>,
        Brijesh Singh <brijesh.singh@....com>,
        Jim Mattson <jmattson@...gle.com>, x86@...nel.org,
        Daniel Vetter <daniel@...ll.ch>,
        Borislav Petkov <bp@...en8.de>,
        Zhenyu Wang <zhenyuw@...ux.intel.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Maxim Levitsky <mlevitsk@...hat.com>
Subject: [PATCH RESEND 25/30] KVM: x86: nSVM: support PAUSE filter threshold and count when cpu_pm=on

Allow L1 to use these settings if L0 disables PAUSE interception
(AKA cpu_pm=on)

Signed-off-by: Maxim Levitsky <mlevitsk@...hat.com>
---
 arch/x86/kvm/svm/nested.c |  6 ++++++
 arch/x86/kvm/svm/svm.c    | 17 +++++++++++++++++
 arch/x86/kvm/svm/svm.h    |  2 ++
 3 files changed, 25 insertions(+)

diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c
index bdcb23c76e89e..601d38ae05cc6 100644
--- a/arch/x86/kvm/svm/nested.c
+++ b/arch/x86/kvm/svm/nested.c
@@ -630,6 +630,12 @@ static void nested_vmcb02_prepare_control(struct vcpu_svm *svm)
 	if (!nested_vmcb_needs_vls_intercept(svm))
 		svm->vmcb->control.virt_ext |= VIRTUAL_VMLOAD_VMSAVE_ENABLE_MASK;
 
+	if (svm->pause_filter_enabled)
+		svm->vmcb->control.pause_filter_count = svm->nested.ctl.pause_filter_count;
+
+	if (svm->pause_threshold_enabled)
+		svm->vmcb->control.pause_filter_thresh = svm->nested.ctl.pause_filter_thresh;
+
 	nested_svm_transition_tlb_flush(vcpu);
 
 	/* Enter Guest-Mode */
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 0f068da098d9f..e49043807ec44 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -3997,6 +3997,17 @@ static void svm_vcpu_after_set_cpuid(struct kvm_vcpu *vcpu)
 
 	svm->v_vmload_vmsave_enabled = vls && guest_cpuid_has(vcpu, X86_FEATURE_V_VMSAVE_VMLOAD);
 
+	if (kvm_pause_in_guest(vcpu->kvm)) {
+		svm->pause_filter_enabled = pause_filter_count > 0 &&
+					    guest_cpuid_has(vcpu, X86_FEATURE_PAUSEFILTER);
+
+		svm->pause_threshold_enabled = pause_filter_thresh > 0 &&
+					    guest_cpuid_has(vcpu, X86_FEATURE_PFTHRESHOLD);
+	} else {
+		svm->pause_filter_enabled = false;
+		svm->pause_threshold_enabled = false;
+	}
+
 	svm_recalc_instruction_intercepts(vcpu, svm);
 
 	/* For sev guests, the memory encryption bit is not reserved in CR3.  */
@@ -4806,6 +4817,12 @@ static __init void svm_set_cpu_caps(void)
 		if (vls)
 			kvm_cpu_cap_set(X86_FEATURE_V_VMSAVE_VMLOAD);
 
+		if (pause_filter_count)
+			kvm_cpu_cap_set(X86_FEATURE_PAUSEFILTER);
+
+		if (pause_filter_thresh)
+			kvm_cpu_cap_set(X86_FEATURE_PFTHRESHOLD);
+
 		/* Nested VM can receive #VMEXIT instead of triggering #GP */
 		kvm_cpu_cap_set(X86_FEATURE_SVME_ADDR_CHK);
 	}
diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h
index e8ffd458a5575..297ec57f9941c 100644
--- a/arch/x86/kvm/svm/svm.h
+++ b/arch/x86/kvm/svm/svm.h
@@ -222,6 +222,8 @@ struct vcpu_svm {
 	bool tsc_scaling_enabled          : 1;
 	bool lbrv_enabled                 : 1;
 	bool v_vmload_vmsave_enabled      : 1;
+	bool pause_filter_enabled         : 1;
+	bool pause_threshold_enabled      : 1;
 
 	u32 ldr_reg;
 	u32 dfr_reg;
-- 
2.26.3