From patchwork Mon Mar 30 13:03:29 2009 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gleb Natapov X-Patchwork-Id: 15129 Received: from vger.kernel.org (vger.kernel.org [209.132.176.167]) by demeter.kernel.org (8.14.2/8.14.2) with ESMTP id n2UD3Yvn031044 for ; Mon, 30 Mar 2009 13:03:34 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753029AbZC3NDd (ORCPT ); Mon, 30 Mar 2009 09:03:33 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752874AbZC3NDd (ORCPT ); Mon, 30 Mar 2009 09:03:33 -0400 Received: from mx2.redhat.com ([66.187.237.31]:41528 "EHLO mx2.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751938AbZC3NDc (ORCPT ); Mon, 30 Mar 2009 09:03:32 -0400 Received: from int-mx2.corp.redhat.com (int-mx2.corp.redhat.com [172.16.27.26]) by mx2.redhat.com (8.13.8/8.13.8) with ESMTP id n2UD3U4G011632 for ; Mon, 30 Mar 2009 09:03:30 -0400 Received: from ns3.rdu.redhat.com (ns3.rdu.redhat.com [10.11.255.199]) by int-mx2.corp.redhat.com (8.13.1/8.13.1) with ESMTP id n2UD3UTX000596; Mon, 30 Mar 2009 09:03:31 -0400 Received: from dhcp-1-237.tlv.redhat.com (dhcp-1-237.tlv.redhat.com [10.35.1.237]) by ns3.rdu.redhat.com (8.13.8/8.13.8) with ESMTP id n2UD3TBk015792; Mon, 30 Mar 2009 09:03:30 -0400 Received: from trex.usersys.redhat.com (localhost [127.0.0.1]) by dhcp-1-237.tlv.redhat.com (Postfix) with ESMTP id 726E618D395; Mon, 30 Mar 2009 16:03:29 +0300 (IDT) From: Gleb Natapov Subject: [PATCH v2 5/5] Fix unneeded instruction skipping during task switching. To: avi@redhat.com Cc: kvm@vger.kernel.org Date: Mon, 30 Mar 2009 16:03:29 +0300 Message-ID: <20090330130329.31823.62723.stgit@trex.usersys.redhat.com> In-Reply-To: <20090330130308.31823.11156.stgit@trex.usersys.redhat.com> References: <20090330130308.31823.11156.stgit@trex.usersys.redhat.com> User-Agent: StGIT/0.14.2 MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.58 on 172.16.27.26 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org There is no need to skip instruction if the reason for a task switch is a task gate in IDT and access to it is caused by an external even. The problem is currently solved only for VMX since there is no reliable way to skip an instruction in SVM. We should emulate it instead. Signed-off-by: Gleb Natapov --- arch/x86/include/asm/svm.h | 1 + arch/x86/kvm/svm.c | 25 ++++++++++++++++++------- arch/x86/kvm/vmx.c | 40 +++++++++++++++++++++++++++++----------- arch/x86/kvm/x86.c | 5 ++++- 4 files changed, 52 insertions(+), 19 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html diff --git a/arch/x86/include/asm/svm.h b/arch/x86/include/asm/svm.h index 82ada75..85574b7 100644 --- a/arch/x86/include/asm/svm.h +++ b/arch/x86/include/asm/svm.h @@ -225,6 +225,7 @@ struct __attribute__ ((__packed__)) vmcb { #define SVM_EVTINJ_VALID_ERR (1 << 11) #define SVM_EXITINTINFO_VEC_MASK SVM_EVTINJ_VEC_MASK +#define SVM_EXITINTINFO_TYPE_MASK SVM_EVTINJ_TYPE_MASK #define SVM_EXITINTINFO_TYPE_INTR SVM_EVTINJ_TYPE_INTR #define SVM_EXITINTINFO_TYPE_NMI SVM_EVTINJ_TYPE_NMI diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index 1fcbc17..3ffb695 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -1823,17 +1823,28 @@ static int task_switch_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run) { u16 tss_selector; + int reason; + int int_type = svm->vmcb->control.exit_int_info & + SVM_EXITINTINFO_TYPE_MASK; tss_selector = (u16)svm->vmcb->control.exit_info_1; + if (svm->vmcb->control.exit_info_2 & (1ULL << SVM_EXITINFOSHIFT_TS_REASON_IRET)) - return kvm_task_switch(&svm->vcpu, tss_selector, - TASK_SWITCH_IRET); - if (svm->vmcb->control.exit_info_2 & - (1ULL << SVM_EXITINFOSHIFT_TS_REASON_JMP)) - return kvm_task_switch(&svm->vcpu, tss_selector, - TASK_SWITCH_JMP); - return kvm_task_switch(&svm->vcpu, tss_selector, TASK_SWITCH_CALL); + reason = TASK_SWITCH_IRET; + else if (svm->vmcb->control.exit_info_2 & + (1ULL << SVM_EXITINFOSHIFT_TS_REASON_JMP)) + reason = TASK_SWITCH_JMP; + else if (svm->vmcb->control.exit_int_info & SVM_EXITINTINFO_VALID) + reason = TASK_SWITCH_GATE; + else + reason = TASK_SWITCH_CALL; + + + if (reason != TASK_SWITCH_GATE || int_type == SVM_EXITINTINFO_TYPE_SOFT) + skip_emulated_instruction(&svm->vcpu); + + return kvm_task_switch(&svm->vcpu, tss_selector, reason); } static int cpuid_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run) diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index 0da7a9e..01db958 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -3025,22 +3025,40 @@ static int handle_task_switch(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) struct vcpu_vmx *vmx = to_vmx(vcpu); unsigned long exit_qualification; u16 tss_selector; - int reason; + int reason, type, idt_v; + + idt_v = (vmx->idt_vectoring_info & VECTORING_INFO_VALID_MASK); + type = (vmx->idt_vectoring_info & VECTORING_INFO_TYPE_MASK); exit_qualification = vmcs_readl(EXIT_QUALIFICATION); reason = (u32)exit_qualification >> 30; - if (reason == TASK_SWITCH_GATE && vmx->vcpu.arch.nmi_injected && - (vmx->idt_vectoring_info & VECTORING_INFO_VALID_MASK) && - (vmx->idt_vectoring_info & VECTORING_INFO_TYPE_MASK) - == INTR_TYPE_NMI_INTR) { - vcpu->arch.nmi_injected = false; - if (cpu_has_virtual_nmis()) - vmcs_set_bits(GUEST_INTERRUPTIBILITY_INFO, - GUEST_INTR_STATE_NMI); + if (reason == TASK_SWITCH_GATE && idt_v) { + switch (type) { + case INTR_TYPE_NMI_INTR: + vcpu->arch.nmi_injected = false; + if (cpu_has_virtual_nmis()) + vmcs_set_bits(GUEST_INTERRUPTIBILITY_INFO, + GUEST_INTR_STATE_NMI); + break; + case INTR_TYPE_EXT_INTR: + kvm_clear_interrupt_queue(vcpu); + break; + case INTR_TYPE_HARD_EXCEPTION: + case INTR_TYPE_SOFT_EXCEPTION: + kvm_clear_exception_queue(vcpu); + break; + default: + break; + } } tss_selector = exit_qualification; + if (!idt_v || (type != INTR_TYPE_HARD_EXCEPTION && + type != INTR_TYPE_EXT_INTR && + type != INTR_TYPE_NMI_INTR)) + skip_emulated_instruction(vcpu); + if (!kvm_task_switch(vcpu, tss_selector, reason)) return 0; @@ -3292,8 +3310,8 @@ static void vmx_complete_interrupts(struct vcpu_vmx *vmx) vector = idt_vectoring_info & VECTORING_INFO_VECTOR_MASK; type = idt_vectoring_info & VECTORING_INFO_TYPE_MASK; - - switch(type) { + + switch (type) { case INTR_TYPE_NMI_INTR: vmx->vcpu.arch.nmi_injected = true; /* diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index f14c622..9415a03 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -3915,7 +3915,10 @@ int kvm_task_switch(struct kvm_vcpu *vcpu, u16 tss_selector, int reason) kvm_x86_ops->set_rflags(vcpu, eflags & ~X86_EFLAGS_NT); } - kvm_x86_ops->skip_emulated_instruction(vcpu); + /* set back link to prev task only if NT bit is set in eflags + note that old_tss_sel is not used afetr this point */ + if (reason != TASK_SWITCH_CALL && reason != TASK_SWITCH_GATE) + old_tss_sel = 0xffff; /* set back link to prev task only if NT bit is set in eflags note that old_tss_sel is not used afetr this point */