Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759278AbZLOELw (ORCPT ); Mon, 14 Dec 2009 23:11:52 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932355AbZLOELd (ORCPT ); Mon, 14 Dec 2009 23:11:33 -0500 Received: from mx1.redhat.com ([209.132.183.28]:35924 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758766AbZLOEHI (ORCPT ); Mon, 14 Dec 2009 23:07:08 -0500 From: Zachary Amsden To: kvm@vger.kernel.org Cc: Zachary Amsden , Avi Kivity , Marcelo Tosatti , Joerg Roedel , linux-kernel@vger.kernel.org, Dor Laor Subject: [PATCH RFC: kvm tsc virtualization 07/20] Basic SVM implementation of RDTSC trapping. Date: Mon, 14 Dec 2009 18:08:34 -1000 Message-Id: <1260850127-9766-8-git-send-email-zamsden@redhat.com> In-Reply-To: <1260850127-9766-7-git-send-email-zamsden@redhat.com> References: <1260850127-9766-1-git-send-email-zamsden@redhat.com> <1260850127-9766-2-git-send-email-zamsden@redhat.com> <1260850127-9766-3-git-send-email-zamsden@redhat.com> <1260850127-9766-4-git-send-email-zamsden@redhat.com> <1260850127-9766-5-git-send-email-zamsden@redhat.com> <1260850127-9766-6-git-send-email-zamsden@redhat.com> <1260850127-9766-7-git-send-email-zamsden@redhat.com> Organization: Frobozz Magic Timekeeping Company Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2496 Lines: 70 Add a dumb version of RDTSC trapping for SVM which just passes through the hardware counter. Signed-off-by: Zachary Amsden --- arch/x86/kvm/emulate.c | 2 +- arch/x86/kvm/svm.c | 15 +++++++++++++++ 2 files changed, 16 insertions(+), 1 deletions(-) diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c index d226dff..76e180f 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -226,7 +226,7 @@ static u32 twobyte_table[256] = { ModRM | ImplicitOps, ModRM, ModRM | ImplicitOps, ModRM, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x30 - 0x3F */ - ImplicitOps, 0, ImplicitOps, 0, + ImplicitOps, ImplicitOps, ImplicitOps, 0, ImplicitOps, ImplicitOps, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x40 - 0x47 */ diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index 34b700f..16c9048 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -571,6 +571,7 @@ static void init_vmcb(struct vcpu_svm *svm) control->intercept = (1ULL << INTERCEPT_INTR) | (1ULL << INTERCEPT_NMI) | (1ULL << INTERCEPT_SMI) | + (1ULL << INTERCEPT_RDTSC) | (1ULL << INTERCEPT_CPUID) | (1ULL << INTERCEPT_INVD) | (1ULL << INTERCEPT_HLT) | @@ -2029,6 +2030,19 @@ static int task_switch_interception(struct vcpu_svm *svm) return kvm_task_switch(&svm->vcpu, tss_selector, reason); } +static int rdtsc_interception(struct vcpu_svm *svm) +{ + u64 tsc; + + rdtscll(tsc); + tsc += svm->vmcb->control.tsc_offset; + kvm_register_write(&svm->vcpu, VCPU_REGS_RAX, tsc & 0xffffffff); + tsc >>= 32; + kvm_register_write(&svm->vcpu, VCPU_REGS_RDX, tsc & 0xffffffff); + skip_emulated_instruction(&svm->vcpu); + return 1; +} + static int cpuid_interception(struct vcpu_svm *svm) { svm->next_rip = kvm_rip_read(&svm->vcpu) + 2; @@ -2326,6 +2340,7 @@ static int (*svm_exit_handlers[])(struct vcpu_svm *svm) = { [SVM_EXIT_INIT] = nop_on_interception, [SVM_EXIT_VINTR] = interrupt_window_interception, /* [SVM_EXIT_CR0_SEL_WRITE] = emulate_on_interception, */ + [SVM_EXIT_RDTSC] = rdtsc_interception, [SVM_EXIT_CPUID] = cpuid_interception, [SVM_EXIT_IRET] = iret_interception, [SVM_EXIT_INVD] = emulate_on_interception, -- 1.6.5.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/