From mboxrd@z Thu Jan 1 00:00:00 1970 From: Gleb Natapov Subject: Re: [PATCH 9/9] [SVM] inject NMI after IRET from a previous NMI, not before. Date: Tue, 5 May 2009 12:47:35 +0300 Message-ID: <20090505094735.GP9795@redhat.com> References: <1241511275-2261-1-git-send-email-gleb@redhat.com> <1241511275-2261-9-git-send-email-gleb@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: kvm@vger.kernel.org To: avi@redhat.com Return-path: Received: from mx2.redhat.com ([66.187.237.31]:42904 "EHLO mx2.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752993AbZEEJrg (ORCPT ); Tue, 5 May 2009 05:47:36 -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 n459lbI9017150 for ; Tue, 5 May 2009 05:47:37 -0400 Content-Disposition: inline In-Reply-To: <1241511275-2261-9-git-send-email-gleb@redhat.com> Sender: kvm-owner@vger.kernel.org List-ID: I noticed a small bug in previous patch. Use this one instead. (change update_db_intercept(to_svm(svm)) -> update_db_intercept(&svm->vcpu)) If NMI is received during handling of another NMI it should be injected immediately after IRET from previous NMI handler, but SVM intercept IRET before instruction execution so we can't inject pending NMI at this point and there is not way to request exit when NMI window opens. This patch fix SVM code to open NMI window after IRET by single stepping over IRET instruction. Signed-off-by: Gleb Natapov diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index fea0429..bcd0857 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -358,6 +358,7 @@ struct kvm_vcpu_arch { unsigned int time_offset; struct page *time_page; + bool singlestep; /* guest is single stepped by KVM */ bool nmi_pending; bool nmi_injected; @@ -772,6 +773,7 @@ enum { #define HF_HIF_MASK (1 << 1) #define HF_VINTR_MASK (1 << 2) #define HF_NMI_MASK (1 << 3) +#define HF_IRET_MASK (1 << 4) /* * Hardware virtualization extension instructions may fault if a diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index d5173a2..5c00258 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -933,15 +933,16 @@ static void svm_set_segment(struct kvm_vcpu *vcpu, } -static int svm_guest_debug(struct kvm_vcpu *vcpu, struct kvm_guest_debug *dbg) +static void update_db_intercept(struct kvm_vcpu *vcpu) { - int old_debug = vcpu->guest_debug; struct vcpu_svm *svm = to_svm(vcpu); - vcpu->guest_debug = dbg->control; - svm->vmcb->control.intercept_exceptions &= ~((1 << DB_VECTOR) | (1 << BP_VECTOR)); + + if (vcpu->arch.singlestep) + svm->vmcb->control.intercept_exceptions |= (1 << DB_VECTOR); + if (vcpu->guest_debug & KVM_GUESTDBG_ENABLE) { if (vcpu->guest_debug & (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP)) @@ -952,6 +953,16 @@ static int svm_guest_debug(struct kvm_vcpu *vcpu, struct kvm_guest_debug *dbg) 1 << BP_VECTOR; } else vcpu->guest_debug = 0; +} + +static int svm_guest_debug(struct kvm_vcpu *vcpu, struct kvm_guest_debug *dbg) +{ + int old_debug = vcpu->guest_debug; + struct vcpu_svm *svm = to_svm(vcpu); + + vcpu->guest_debug = dbg->control; + + update_db_intercept(vcpu); if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) svm->vmcb->save.dr7 = dbg->arch.debugreg[7]; @@ -1101,14 +1112,30 @@ static int pf_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run) static int db_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run) { if (!(svm->vcpu.guest_debug & - (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP))) { + (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP)) && + !svm->vcpu.arch.singlestep) { kvm_queue_exception(&svm->vcpu, DB_VECTOR); return 1; } - kvm_run->exit_reason = KVM_EXIT_DEBUG; - kvm_run->debug.arch.pc = svm->vmcb->save.cs.base + svm->vmcb->save.rip; - kvm_run->debug.arch.exception = DB_VECTOR; - return 0; + + if (svm->vcpu.arch.singlestep) { + svm->vcpu.arch.singlestep = false; + if (!(svm->vcpu.guest_debug & KVM_GUESTDBG_SINGLESTEP)) + svm->vmcb->save.rflags &= + ~(X86_EFLAGS_TF | X86_EFLAGS_RF); + update_db_intercept(&svm->vcpu); + } + + if (svm->vcpu.guest_debug & + (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP)){ + kvm_run->exit_reason = KVM_EXIT_DEBUG; + kvm_run->debug.arch.pc = + svm->vmcb->save.cs.base + svm->vmcb->save.rip; + kvm_run->debug.arch.exception = DB_VECTOR; + return 0; + } + + return 1; } static int bp_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run) @@ -1855,7 +1882,7 @@ static int iret_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run) { ++svm->vcpu.stat.nmi_window_exits; svm->vmcb->control.intercept &= ~(1UL << INTERCEPT_IRET); - svm->vcpu.arch.hflags &= ~HF_NMI_MASK; + svm->vcpu.arch.hflags |= HF_IRET_MASK; return 1; } @@ -2331,8 +2358,16 @@ static void enable_nmi_window(struct kvm_vcpu *vcpu) { struct vcpu_svm *svm = to_svm(vcpu); - if (svm->vmcb->control.int_state & SVM_INTERRUPT_SHADOW_MASK) - enable_irq_window(vcpu); + if ((svm->vcpu.arch.hflags & (HF_NMI_MASK | HF_IRET_MASK)) + == HF_NMI_MASK) + return; /* IRET will cause a vm exit */ + + /* Something prevents NMI from been injected. Single step over + possible problem (IRET or exception injection or interrupt + shadow) */ + vcpu->arch.singlestep = true; + svm->vmcb->save.rflags |= (X86_EFLAGS_TF | X86_EFLAGS_RF); + update_db_intercept(vcpu); } static int svm_set_tss_addr(struct kvm *kvm, unsigned int addr) @@ -2375,6 +2410,9 @@ static void svm_complete_interrupts(struct vcpu_svm *svm) int type; u32 exitintinfo = svm->vmcb->control.exit_int_info; + if (svm->vcpu.arch.hflags & HF_IRET_MASK) + svm->vcpu.arch.hflags &= ~(HF_NMI_MASK | HF_IRET_MASK); + svm->vcpu.arch.nmi_injected = false; kvm_clear_exception_queue(&svm->vcpu); kvm_clear_interrupt_queue(&svm->vcpu); -- Gleb.