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From: Yang Weijiang <weijiang.yang@intel.com>
To: pbonzini@redhat.com, jmattson@google.com, seanjc@google.com,
	vkuznets@redhat.com, wei.w.wang@intel.com,
	like.xu.linux@gmail.com, kvm@vger.kernel.org,
	linux-kernel@vger.kernel.org
Cc: Yang Weijiang <weijiang.yang@intel.com>
Subject: [PATCH v7 14/15] KVM: x86/vmx: Flip Arch LBREn bit on guest state change
Date: Fri,  6 Aug 2021 15:42:24 +0800	[thread overview]
Message-ID: <1628235745-26566-15-git-send-email-weijiang.yang@intel.com> (raw)
In-Reply-To: <1628235745-26566-1-git-send-email-weijiang.yang@intel.com>

Clear Arch LBREn bit on #SMI and restore it on RSM per ISA spec.,
also clear the bit when guest does warm reset.

Signed-off-by: Yang Weijiang <weijiang.yang@intel.com>
---
 arch/x86/kvm/vmx/vmx.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 31b9c06c9b3b..31969221db8c 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -4513,8 +4513,10 @@ static void vmx_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event)
 	vmx_update_exception_bitmap(vcpu);
 
 	vpid_sync_context(vmx->vpid);
-	if (init_event)
+	if (init_event) {
 		vmx_clear_hlt(vcpu);
+		flip_arch_lbr_ctl(vcpu, false);
+	}
 }
 
 static void vmx_enable_irq_window(struct kvm_vcpu *vcpu)
@@ -7513,6 +7515,7 @@ static int vmx_enter_smm(struct kvm_vcpu *vcpu, char *smstate)
 	vmx->nested.smm.vmxon = vmx->nested.vmxon;
 	vmx->nested.vmxon = false;
 	vmx_clear_hlt(vcpu);
+	flip_arch_lbr_ctl(vcpu, false);
 	return 0;
 }
 
@@ -7533,6 +7536,7 @@ static int vmx_leave_smm(struct kvm_vcpu *vcpu, const char *smstate)
 
 		vmx->nested.smm.guest_mode = false;
 	}
+	flip_arch_lbr_ctl(vcpu, true);
 	return 0;
 }
 
-- 
2.25.1


  parent reply	other threads:[~2021-08-06  7:30 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-06  7:42 [PATCH v7 00/15] Introduce Architectural LBR for vPMU Yang Weijiang
2021-08-06  7:42 ` [PATCH v7 01/15] perf/x86/intel: Fix the comment about guest LBR support on KVM Yang Weijiang
2021-08-06  7:42 ` [PATCH v7 02/15] perf/x86/lbr: Simplify the exposure check for the LBR_INFO registers Yang Weijiang
2021-08-06  7:42 ` [PATCH v7 03/15] KVM: x86: Add Arch LBR MSRs to msrs_to_save_all list Yang Weijiang
2021-08-09 13:07   ` Like Xu
2021-08-06  7:42 ` [PATCH v7 04/15] KVM: vmx/pmu: Emulate MSR_ARCH_LBR_DEPTH for guest Arch LBR Yang Weijiang
2021-08-09 13:16   ` Like Xu
2021-08-10  7:38     ` Yang Weijiang
2021-08-10  7:54       ` Like Xu
2021-08-10  9:08         ` Yang Weijiang
2021-08-06  7:42 ` [PATCH v7 05/15] KVM: vmx/pmu: Emulate MSR_ARCH_LBR_CTL " Yang Weijiang
2021-08-06 16:26   ` kernel test robot
2021-08-09 13:36   ` Like Xu
2021-08-10  8:30     ` Yang Weijiang
2021-08-10  8:37       ` Like Xu
2021-08-06  7:42 ` [PATCH v7 06/15] KVM: x86/pmu: Refactor code to support " Yang Weijiang
2021-08-06  7:42 ` [PATCH v7 07/15] KVM: x86: Refresh CPUID on writes to MSR_IA32_XSS Yang Weijiang
2021-08-06  7:42 ` [PATCH v7 08/15] KVM: x86: Report XSS as an MSR to be saved if there are supported features Yang Weijiang
2021-08-06  7:42 ` [PATCH v7 09/15] KVM: x86: Refine the matching and clearing logic for supported_xss Yang Weijiang
2021-08-06  7:42 ` [PATCH v7 10/15] KVM: x86: Add XSAVE Support for Architectural LBR Yang Weijiang
2021-08-06  7:42 ` [PATCH v7 11/15] KVM: x86/vmx: Check Arch LBR config when return perf capabilities Yang Weijiang
2021-08-06  7:42 ` [PATCH v7 12/15] KVM: nVMX: Add necessary Arch LBR settings for nested VM Yang Weijiang
2021-08-06  7:42 ` [PATCH v7 13/15] KVM: x86/vmx: Clear Arch LBREn bit before inject #DB to guest Yang Weijiang
2021-08-09  5:08   ` Like Xu
2021-08-09  9:02     ` Yang Weijiang
2021-08-06  7:42 ` Yang Weijiang [this message]
2021-08-06  7:42 ` [PATCH v7 15/15] KVM: x86/cpuid: Advise Arch LBR feature in CPUID Yang Weijiang

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