Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752899AbdLKKQa (ORCPT ); Mon, 11 Dec 2017 05:16:30 -0500 Received: from mga06.intel.com ([134.134.136.31]:41500 "EHLO mga06.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752876AbdLKKQ1 (ORCPT ); Mon, 11 Dec 2017 05:16:27 -0500 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.45,391,1508828400"; d="scan'208";a="1496016" From: Luwei Kang To: kvm@vger.kernel.org Cc: tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, x86@kernel.org, pbonzini@redhat.com, rkrcmar@redhat.com, linux-kernel@vger.kernel.org, joro@8bytes.org, Chao Peng , Luwei Kang Subject: [PATCH V4 11/11] KVM: x86: Implement Intel Processor Trace context switch Date: Mon, 11 Dec 2017 04:30:57 +0800 Message-Id: <1512937857-10477-12-git-send-email-luwei.kang@intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1512937857-10477-1-git-send-email-luwei.kang@intel.com> References: <1512937857-10477-1-git-send-email-luwei.kang@intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3535 Lines: 109 From: Chao Peng Load/Store Intel processor trace register in context switch. MSR IA32_RTIT_CTL is loaded/stored automatically from VMCS. In HOST mode, we just need to restore the status of IA32_RTIT_CTL. In HOST_GUEST mode, we need load/resore PT MSRs only when PT is enabled in guest. Signed-off-by: Chao Peng Signed-off-by: Luwei Kang --- arch/x86/kvm/vmx.c | 61 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 61 insertions(+) diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index f948231..d45cc76 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -2144,6 +2144,55 @@ static unsigned long segment_base(u16 selector) } #endif +static inline void pt_load_msr(struct pt_ctx *ctx, unsigned int addr_num) +{ + u32 i; + + wrmsrl(MSR_IA32_RTIT_STATUS, ctx->status); + wrmsrl(MSR_IA32_RTIT_OUTPUT_BASE, ctx->output_base); + wrmsrl(MSR_IA32_RTIT_OUTPUT_MASK, ctx->output_mask); + wrmsrl(MSR_IA32_RTIT_CR3_MATCH, ctx->cr3_match); + for (i = 0; i < addr_num; i++) + wrmsrl(MSR_IA32_RTIT_ADDR0_A + i, ctx->addrs[i]); +} + +static inline void pt_save_msr(struct pt_ctx *ctx, unsigned int addr_num) +{ + u32 i; + + rdmsrl(MSR_IA32_RTIT_STATUS, ctx->status); + rdmsrl(MSR_IA32_RTIT_OUTPUT_BASE, ctx->output_base); + rdmsrl(MSR_IA32_RTIT_OUTPUT_MASK, ctx->output_mask); + rdmsrl(MSR_IA32_RTIT_CR3_MATCH, ctx->cr3_match); + for (i = 0; i < addr_num; i++) + rdmsrl(MSR_IA32_RTIT_ADDR0_A + i, ctx->addrs[i]); +} + +static void pt_guest_enter(struct vcpu_vmx *vmx) +{ + if (pt_mode == PT_MODE_HOST || PT_MODE_HOST_GUEST) + rdmsrl(MSR_IA32_RTIT_CTL, vmx->pt_desc.host.ctl); + + if (pt_mode == PT_MODE_HOST_GUEST && + vmx->pt_desc.guest.ctl & RTIT_CTL_TRACEEN) { + wrmsrl(MSR_IA32_RTIT_CTL, 0); + pt_save_msr(&vmx->pt_desc.host, vmx->pt_desc.addr_num); + pt_load_msr(&vmx->pt_desc.guest, vmx->pt_desc.addr_num); + } +} + +static void pt_guest_exit(struct vcpu_vmx *vmx) +{ + if (pt_mode == PT_MODE_HOST_GUEST && + vmx->pt_desc.guest.ctl & RTIT_CTL_TRACEEN) { + pt_save_msr(&vmx->pt_desc.guest, vmx->pt_desc.addr_num); + pt_load_msr(&vmx->pt_desc.host, vmx->pt_desc.addr_num); + } + + if (pt_mode == PT_MODE_HOST || pt_mode == PT_MODE_HOST_GUEST) + wrmsrl(MSR_IA32_RTIT_CTL, vmx->pt_desc.host.ctl); +} + static void vmx_save_host_state(struct kvm_vcpu *vcpu) { struct vcpu_vmx *vmx = to_vmx(vcpu); @@ -5766,6 +5815,14 @@ static void vmx_vcpu_setup(struct vcpu_vmx *vmx) vmcs_write64(PML_ADDRESS, page_to_phys(vmx->pml_pg)); vmcs_write16(GUEST_PML_INDEX, PML_ENTITY_NUM - 1); } + + if (pt_mode == PT_MODE_HOST_GUEST) { + memset(&vmx->pt_desc, 0, sizeof(vmx->pt_desc)); + vmx->pt_desc.addr_num = kvm_get_pt_addr_cnt(); + /* Bit[6~0] are forced to 1, writes are ignored. */ + vmx->pt_desc.guest.output_mask = 0x7F; + vmcs_write64(GUEST_IA32_RTIT_CTL, 0); + } } static void vmx_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event) @@ -9589,6 +9646,8 @@ static void __noclone vmx_vcpu_run(struct kvm_vcpu *vcpu) vcpu->arch.pkru != vmx->host_pkru) __write_pkru(vcpu->arch.pkru); + pt_guest_enter(vmx); + atomic_switch_perf_msrs(vmx); debugctlmsr = get_debugctlmsr(); @@ -9724,6 +9783,8 @@ static void __noclone vmx_vcpu_run(struct kvm_vcpu *vcpu) | (1 << VCPU_EXREG_CR3)); vcpu->arch.regs_dirty = 0; + pt_guest_exit(vmx); + /* * eager fpu is enabled if PKEY is supported and CR4 is switched * back on host, so it is safe to read guest PKRU from current -- 1.8.3.1