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Message-ID: <4692a0906554cf6f0473ad138da1b4d739388c89.camel@redhat.com>
Date: Mon, 18 Jul 2022 16:10:12 +0300
From: Maxim Levitsky <mlevitsk@...hat.com>
To: Sean Christopherson <seanjc@...gle.com>,
Paolo Bonzini <pbonzini@...hat.com>
Cc: Vitaly Kuznetsov <vkuznets@...hat.com>,
Wanpeng Li <wanpengli@...cent.com>,
Jim Mattson <jmattson@...gle.com>,
Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
linux-kernel@...r.kernel.org, Oliver Upton <oupton@...gle.com>,
Peter Shier <pshier@...gle.com>
Subject: Re: [PATCH v2 12/21] KVM: x86: Make kvm_queued_exception a properly
named, visible struct
On Mon, 2022-07-18 at 16:07 +0300, Maxim Levitsky wrote:
> On Tue, 2022-06-14 at 20:47 +0000, Sean Christopherson wrote:
> > Move the definition of "struct kvm_queued_exception" out of kvm_vcpu_arch
> > in anticipation of adding a second instance in kvm_vcpu_arch to handle
> > exceptions that occur when vectoring an injected exception and are
> > morphed to VM-Exit instead of leading to #DF.
> >
> > Opportunistically take advantage of the churn to rename "nr" to "vector".
> >
> > No functional change intended.
> >
> > Signed-off-by: Sean Christopherson <seanjc@...gle.com>
> > ---
> >
> ...
>
>
> Is this change below intentional? My memory on nested_apf_token is quite rusty, but at least
> if possible, I would prefer this to be done in separate patch.
Sorry, I replied to the wrong mail, but the newer version also has the same issue.
(It should be v3 btw.)
Best regards,
Maxim Levitsky
>
>
> Best regards,
> Maxim Levitsky
>
> > - else if (svm->vcpu.arch.exception.has_payload)
> > - vmcb->control.exit_info_2 = svm->vcpu.arch.exception.payload;
> > + if (ex->vector == PF_VECTOR) {
> > + if (ex->has_payload)
> > + vmcb->control.exit_info_2 = ex->payload;
> > else
> > - vmcb->control.exit_info_2 = svm->vcpu.arch.cr2;
> > - } else if (nr == DB_VECTOR) {
> > + vmcb->control.exit_info_2 = vcpu->arch.cr2;
> > + } else if (ex->vector == DB_VECTOR) {
> > /* See inject_pending_event. */
> > - kvm_deliver_exception_payload(&svm->vcpu);
> > - if (svm->vcpu.arch.dr7 & DR7_GD) {
> > - svm->vcpu.arch.dr7 &= ~DR7_GD;
> > - kvm_update_dr7(&svm->vcpu);
> > + kvm_deliver_exception_payload(vcpu, ex);
> > +
> > + if (vcpu->arch.dr7 & DR7_GD) {
> > + vcpu->arch.dr7 &= ~DR7_GD;
> > + kvm_update_dr7(vcpu);
> > }
> > - } else
> > - WARN_ON(svm->vcpu.arch.exception.has_payload);
> > + } else {
> > + WARN_ON(ex->has_payload);
> > + }
> >
> > nested_svm_vmexit(svm);
> > }
> > @@ -1372,7 +1373,7 @@ static int svm_check_nested_events(struct kvm_vcpu *vcpu)
> > return -EBUSY;
> > if (!nested_exit_on_exception(svm))
> > return 0;
> > - nested_svm_inject_exception_vmexit(svm);
> > + nested_svm_inject_exception_vmexit(vcpu);
> > return 0;
> > }
> >
> > diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
> > index ca39f76ca44b..6b80046a014f 100644
> > --- a/arch/x86/kvm/svm/svm.c
> > +++ b/arch/x86/kvm/svm/svm.c
> > @@ -432,22 +432,20 @@ static int svm_update_soft_interrupt_rip(struct kvm_vcpu *vcpu)
> >
> > static void svm_inject_exception(struct kvm_vcpu *vcpu)
> > {
> > + struct kvm_queued_exception *ex = &vcpu->arch.exception;
> > struct vcpu_svm *svm = to_svm(vcpu);
> > - unsigned nr = vcpu->arch.exception.nr;
> > - bool has_error_code = vcpu->arch.exception.has_error_code;
> > - u32 error_code = vcpu->arch.exception.error_code;
> >
> > - kvm_deliver_exception_payload(vcpu);
> > + kvm_deliver_exception_payload(vcpu, ex);
> >
> > - if (kvm_exception_is_soft(nr) &&
> > + if (kvm_exception_is_soft(ex->vector) &&
> > svm_update_soft_interrupt_rip(vcpu))
> > return;
> >
> > - svm->vmcb->control.event_inj = nr
> > + svm->vmcb->control.event_inj = ex->vector
> > | SVM_EVTINJ_VALID
> > - | (has_error_code ? SVM_EVTINJ_VALID_ERR : 0)
> > + | (ex->has_error_code ? SVM_EVTINJ_VALID_ERR : 0)
> > | SVM_EVTINJ_TYPE_EXEPT;
> > - svm->vmcb->control.event_inj_err = error_code;
> > + svm->vmcb->control.event_inj_err = ex->error_code;
> > }
> >
> > static void svm_init_erratum_383(void)
> > diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
> > index 7b644513c82b..fafdcbfeca1f 100644
> > --- a/arch/x86/kvm/vmx/nested.c
> > +++ b/arch/x86/kvm/vmx/nested.c
> > @@ -445,29 +445,27 @@ static bool nested_vmx_is_page_fault_vmexit(struct vmcs12 *vmcs12,
> > */
> > static int nested_vmx_check_exception(struct kvm_vcpu *vcpu, unsigned long *exit_qual)
> > {
> > + struct kvm_queued_exception *ex = &vcpu->arch.exception;
> > struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
> > - unsigned int nr = vcpu->arch.exception.nr;
> > - bool has_payload = vcpu->arch.exception.has_payload;
> > - unsigned long payload = vcpu->arch.exception.payload;
> >
> > - if (nr == PF_VECTOR) {
> > - if (vcpu->arch.exception.nested_apf) {
> > + if (ex->vector == PF_VECTOR) {
> > + if (ex->nested_apf) {
> > *exit_qual = vcpu->arch.apf.nested_apf_token;
> > return 1;
> > }
> > - if (nested_vmx_is_page_fault_vmexit(vmcs12,
> > - vcpu->arch.exception.error_code)) {
> > - *exit_qual = has_payload ? payload : vcpu->arch.cr2;
> > + if (nested_vmx_is_page_fault_vmexit(vmcs12, ex->error_code)) {
> > + *exit_qual = ex->has_payload ? ex->payload : vcpu->arch.cr2;
> > return 1;
> > }
> > - } else if (vmcs12->exception_bitmap & (1u << nr)) {
> > - if (nr == DB_VECTOR) {
> > - if (!has_payload) {
> > - payload = vcpu->arch.dr6;
> > - payload &= ~DR6_BT;
> > - payload ^= DR6_ACTIVE_LOW;
> > + } else if (vmcs12->exception_bitmap & (1u << ex->vector)) {
> > + if (ex->vector == DB_VECTOR) {
> > + if (ex->has_payload) {
> > + *exit_qual = ex->payload;
> > + } else {
> > + *exit_qual = vcpu->arch.dr6;
> > + *exit_qual &= ~DR6_BT;
> > + *exit_qual ^= DR6_ACTIVE_LOW;
> > }
> > - *exit_qual = payload;
> > } else
> > *exit_qual = 0;
> > return 1;
> > @@ -3724,7 +3722,7 @@ static void vmcs12_save_pending_event(struct kvm_vcpu *vcpu,
> > is_double_fault(exit_intr_info))) {
> > vmcs12->idt_vectoring_info_field = 0;
> > } else if (vcpu->arch.exception.injected) {
> > - nr = vcpu->arch.exception.nr;
> > + nr = vcpu->arch.exception.vector;
> > idt_vectoring = nr | VECTORING_INFO_VALID_MASK;
> >
> > if (kvm_exception_is_soft(nr)) {
> > @@ -3828,11 +3826,11 @@ static int vmx_complete_nested_posted_interrupt(struct kvm_vcpu *vcpu)
> > static void nested_vmx_inject_exception_vmexit(struct kvm_vcpu *vcpu,
> > unsigned long exit_qual)
> > {
> > + struct kvm_queued_exception *ex = &vcpu->arch.exception;
> > + u32 intr_info = ex->vector | INTR_INFO_VALID_MASK;
> > struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
> > - unsigned int nr = vcpu->arch.exception.nr;
> > - u32 intr_info = nr | INTR_INFO_VALID_MASK;
> >
> > - if (vcpu->arch.exception.has_error_code) {
> > + if (ex->has_error_code) {
> > /*
> > * Intel CPUs will never generate an error code with bits 31:16
> > * set, and more importantly VMX disallows setting bits 31:16
> > @@ -3840,11 +3838,11 @@ static void nested_vmx_inject_exception_vmexit(struct kvm_vcpu *vcpu,
> > * mimic hardware and avoid inducing failure on nested VM-Entry
> > * if L1 chooses to inject the exception back to L2.
> > */
> > - vmcs12->vm_exit_intr_error_code = (u16)vcpu->arch.exception.error_code;
> > + vmcs12->vm_exit_intr_error_code = (u16)ex->error_code;
> > intr_info |= INTR_INFO_DELIVER_CODE_MASK;
> > }
> >
> > - if (kvm_exception_is_soft(nr))
> > + if (kvm_exception_is_soft(ex->vector))
> > intr_info |= INTR_TYPE_SOFT_EXCEPTION;
> > else
> > intr_info |= INTR_TYPE_HARD_EXCEPTION;
> > @@ -3875,7 +3873,7 @@ static void nested_vmx_inject_exception_vmexit(struct kvm_vcpu *vcpu,
> > static inline unsigned long vmx_get_pending_dbg_trap(struct kvm_vcpu *vcpu)
> > {
> > if (!vcpu->arch.exception.pending ||
> > - vcpu->arch.exception.nr != DB_VECTOR)
> > + vcpu->arch.exception.vector != DB_VECTOR)
> > return 0;
> >
> > /* General Detect #DBs are always fault-like. */
> > diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
> > index 26b863c78a9f..7ef5659a1bbd 100644
> > --- a/arch/x86/kvm/vmx/vmx.c
> > +++ b/arch/x86/kvm/vmx/vmx.c
> > @@ -1585,7 +1585,7 @@ static void vmx_update_emulated_instruction(struct kvm_vcpu *vcpu)
> > */
> > if (nested_cpu_has_mtf(vmcs12) &&
> > (!vcpu->arch.exception.pending ||
> > - vcpu->arch.exception.nr == DB_VECTOR))
> > + vcpu->arch.exception.vector == DB_VECTOR))
> > vmx->nested.mtf_pending = true;
> > else
> > vmx->nested.mtf_pending = false;
> > @@ -1612,15 +1612,13 @@ static void vmx_clear_hlt(struct kvm_vcpu *vcpu)
> >
> > static void vmx_inject_exception(struct kvm_vcpu *vcpu)
> > {
> > + struct kvm_queued_exception *ex = &vcpu->arch.exception;
> > + u32 intr_info = ex->vector | INTR_INFO_VALID_MASK;
> > struct vcpu_vmx *vmx = to_vmx(vcpu);
> > - unsigned nr = vcpu->arch.exception.nr;
> > - bool has_error_code = vcpu->arch.exception.has_error_code;
> > - u32 error_code = vcpu->arch.exception.error_code;
> > - u32 intr_info = nr | INTR_INFO_VALID_MASK;
> >
> > - kvm_deliver_exception_payload(vcpu);
> > + kvm_deliver_exception_payload(vcpu, ex);
> >
> > - if (has_error_code) {
> > + if (ex->has_error_code) {
> > /*
> > * Despite the error code being architecturally defined as 32
> > * bits, and the VMCS field being 32 bits, Intel CPUs and thus
> > @@ -1630,21 +1628,21 @@ static void vmx_inject_exception(struct kvm_vcpu *vcpu)
> > * the upper bits to avoid VM-Fail, losing information that
> > * does't really exist is preferable to killing the VM.
> > */
> > - vmcs_write32(VM_ENTRY_EXCEPTION_ERROR_CODE, (u16)error_code);
> > + vmcs_write32(VM_ENTRY_EXCEPTION_ERROR_CODE, (u16)ex->error_code);
> > intr_info |= INTR_INFO_DELIVER_CODE_MASK;
> > }
> >
> > if (vmx->rmode.vm86_active) {
> > int inc_eip = 0;
> > - if (kvm_exception_is_soft(nr))
> > + if (kvm_exception_is_soft(ex->vector))
> > inc_eip = vcpu->arch.event_exit_inst_len;
> > - kvm_inject_realmode_interrupt(vcpu, nr, inc_eip);
> > + kvm_inject_realmode_interrupt(vcpu, ex->vector, inc_eip);
> > return;
> > }
> >
> > WARN_ON_ONCE(vmx->emulation_required);
> >
> > - if (kvm_exception_is_soft(nr)) {
> > + if (kvm_exception_is_soft(ex->vector)) {
> > vmcs_write32(VM_ENTRY_INSTRUCTION_LEN,
> > vmx->vcpu.arch.event_exit_inst_len);
> > intr_info |= INTR_TYPE_SOFT_EXCEPTION;
> > diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> > index b63421d511c5..511c0c8af80e 100644
> > --- a/arch/x86/kvm/x86.c
> > +++ b/arch/x86/kvm/x86.c
> > @@ -557,16 +557,13 @@ static int exception_type(int vector)
> > return EXCPT_FAULT;
> > }
> >
> > -void kvm_deliver_exception_payload(struct kvm_vcpu *vcpu)
> > +void kvm_deliver_exception_payload(struct kvm_vcpu *vcpu,
> > + struct kvm_queued_exception *ex)
> > {
> > - unsigned nr = vcpu->arch.exception.nr;
> > - bool has_payload = vcpu->arch.exception.has_payload;
> > - unsigned long payload = vcpu->arch.exception.payload;
> > -
> > - if (!has_payload)
> > + if (!ex->has_payload)
> > return;
> >
> > - switch (nr) {
> > + switch (ex->vector) {
> > case DB_VECTOR:
> > /*
> > * "Certain debug exceptions may clear bit 0-3. The
> > @@ -591,8 +588,8 @@ void kvm_deliver_exception_payload(struct kvm_vcpu *vcpu)
> > * So they need to be flipped for DR6.
> > */
> > vcpu->arch.dr6 |= DR6_ACTIVE_LOW;
> > - vcpu->arch.dr6 |= payload;
> > - vcpu->arch.dr6 ^= payload & DR6_ACTIVE_LOW;
> > + vcpu->arch.dr6 |= ex->payload;
> > + vcpu->arch.dr6 ^= ex->payload & DR6_ACTIVE_LOW;
> >
> > /*
> > * The #DB payload is defined as compatible with the 'pending
> > @@ -603,12 +600,12 @@ void kvm_deliver_exception_payload(struct kvm_vcpu *vcpu)
> > vcpu->arch.dr6 &= ~BIT(12);
> > break;
> > case PF_VECTOR:
> > - vcpu->arch.cr2 = payload;
> > + vcpu->arch.cr2 = ex->payload;
> > break;
> > }
> >
> > - vcpu->arch.exception.has_payload = false;
> > - vcpu->arch.exception.payload = 0;
> > + ex->has_payload = false;
> > + ex->payload = 0;
> > }
> > EXPORT_SYMBOL_GPL(kvm_deliver_exception_payload);
> >
> > @@ -647,17 +644,18 @@ static void kvm_multiple_exception(struct kvm_vcpu *vcpu,
> > vcpu->arch.exception.injected = false;
> > }
> > vcpu->arch.exception.has_error_code = has_error;
> > - vcpu->arch.exception.nr = nr;
> > + vcpu->arch.exception.vector = nr;
> > vcpu->arch.exception.error_code = error_code;
> > vcpu->arch.exception.has_payload = has_payload;
> > vcpu->arch.exception.payload = payload;
> > if (!is_guest_mode(vcpu))
> > - kvm_deliver_exception_payload(vcpu);
> > + kvm_deliver_exception_payload(vcpu,
> > + &vcpu->arch.exception);
> > return;
> > }
> >
> > /* to check exception */
> > - prev_nr = vcpu->arch.exception.nr;
> > + prev_nr = vcpu->arch.exception.vector;
> > if (prev_nr == DF_VECTOR) {
> > /* triple fault -> shutdown */
> > kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);
> > @@ -675,7 +673,7 @@ static void kvm_multiple_exception(struct kvm_vcpu *vcpu,
> > vcpu->arch.exception.pending = true;
> > vcpu->arch.exception.injected = false;
> > vcpu->arch.exception.has_error_code = true;
> > - vcpu->arch.exception.nr = DF_VECTOR;
> > + vcpu->arch.exception.vector = DF_VECTOR;
> > vcpu->arch.exception.error_code = 0;
> > vcpu->arch.exception.has_payload = false;
> > vcpu->arch.exception.payload = 0;
> > @@ -4886,25 +4884,24 @@ static int kvm_vcpu_ioctl_x86_set_mce(struct kvm_vcpu *vcpu,
> > static void kvm_vcpu_ioctl_x86_get_vcpu_events(struct kvm_vcpu *vcpu,
> > struct kvm_vcpu_events *events)
> > {
> > + struct kvm_queued_exception *ex = &vcpu->arch.exception;
> > +
> > process_nmi(vcpu);
> >
> > if (kvm_check_request(KVM_REQ_SMI, vcpu))
> > process_smi(vcpu);
> >
> > /*
> > - * In guest mode, payload delivery should be deferred,
> > - * so that the L1 hypervisor can intercept #PF before
> > - * CR2 is modified (or intercept #DB before DR6 is
> > - * modified under nVMX). Unless the per-VM capability,
> > - * KVM_CAP_EXCEPTION_PAYLOAD, is set, we may not defer the delivery of
> > - * an exception payload and handle after a KVM_GET_VCPU_EVENTS. Since we
> > - * opportunistically defer the exception payload, deliver it if the
> > - * capability hasn't been requested before processing a
> > - * KVM_GET_VCPU_EVENTS.
> > + * In guest mode, payload delivery should be deferred if the exception
> > + * will be intercepted by L1, e.g. KVM should not modifying CR2 if L1
> > + * intercepts #PF, ditto for DR6 and #DBs. If the per-VM capability,
> > + * KVM_CAP_EXCEPTION_PAYLOAD, is not set, userspace may or may not
> > + * propagate the payload and so it cannot be safely deferred. Deliver
> > + * the payload if the capability hasn't been requested.
> > */
> > if (!vcpu->kvm->arch.exception_payload_enabled &&
> > - vcpu->arch.exception.pending && vcpu->arch.exception.has_payload)
> > - kvm_deliver_exception_payload(vcpu);
> > + ex->pending && ex->has_payload)
> > + kvm_deliver_exception_payload(vcpu, ex);
> >
> > /*
> > * The API doesn't provide the instruction length for software
> > @@ -4912,26 +4909,25 @@ static void kvm_vcpu_ioctl_x86_get_vcpu_events(struct kvm_vcpu *vcpu,
> > * isn't advanced, we should expect to encounter the exception
> > * again.
> > */
> > - if (kvm_exception_is_soft(vcpu->arch.exception.nr)) {
> > + if (kvm_exception_is_soft(ex->vector)) {
> > events->exception.injected = 0;
> > events->exception.pending = 0;
> > } else {
> > - events->exception.injected = vcpu->arch.exception.injected;
> > - events->exception.pending = vcpu->arch.exception.pending;
> > + events->exception.injected = ex->injected;
> > + events->exception.pending = ex->pending;
> > /*
> > * For ABI compatibility, deliberately conflate
> > * pending and injected exceptions when
> > * KVM_CAP_EXCEPTION_PAYLOAD isn't enabled.
> > */
> > if (!vcpu->kvm->arch.exception_payload_enabled)
> > - events->exception.injected |=
> > - vcpu->arch.exception.pending;
> > + events->exception.injected |= ex->pending;
> > }
> > - events->exception.nr = vcpu->arch.exception.nr;
> > - events->exception.has_error_code = vcpu->arch.exception.has_error_code;
> > - events->exception.error_code = vcpu->arch.exception.error_code;
> > - events->exception_has_payload = vcpu->arch.exception.has_payload;
> > - events->exception_payload = vcpu->arch.exception.payload;
> > + events->exception.nr = ex->vector;
> > + events->exception.has_error_code = ex->has_error_code;
> > + events->exception.error_code = ex->error_code;
> > + events->exception_has_payload = ex->has_payload;
> > + events->exception_payload = ex->payload;
> >
> > events->interrupt.injected =
> > vcpu->arch.interrupt.injected && !vcpu->arch.interrupt.soft;
> > @@ -5003,7 +4999,7 @@ static int kvm_vcpu_ioctl_x86_set_vcpu_events(struct kvm_vcpu *vcpu,
> > process_nmi(vcpu);
> > vcpu->arch.exception.injected = events->exception.injected;
> > vcpu->arch.exception.pending = events->exception.pending;
> > - vcpu->arch.exception.nr = events->exception.nr;
> > + vcpu->arch.exception.vector = events->exception.nr;
> > vcpu->arch.exception.has_error_code = events->exception.has_error_code;
> > vcpu->arch.exception.error_code = events->exception.error_code;
> > vcpu->arch.exception.has_payload = events->exception_has_payload;
> > @@ -9497,7 +9493,7 @@ int kvm_check_nested_events(struct kvm_vcpu *vcpu)
> >
> > static void kvm_inject_exception(struct kvm_vcpu *vcpu)
> > {
> > - trace_kvm_inj_exception(vcpu->arch.exception.nr,
> > + trace_kvm_inj_exception(vcpu->arch.exception.vector,
> > vcpu->arch.exception.has_error_code,
> > vcpu->arch.exception.error_code,
> > vcpu->arch.exception.injected);
> > @@ -9569,12 +9565,12 @@ static int inject_pending_event(struct kvm_vcpu *vcpu, bool *req_immediate_exit)
> > * describe the behavior of General Detect #DBs, which are
> > * fault-like. They do _not_ set RF, a la code breakpoints.
> > */
> > - if (exception_type(vcpu->arch.exception.nr) == EXCPT_FAULT)
> > + if (exception_type(vcpu->arch.exception.vector) == EXCPT_FAULT)
> > __kvm_set_rflags(vcpu, kvm_get_rflags(vcpu) |
> > X86_EFLAGS_RF);
> >
> > - if (vcpu->arch.exception.nr == DB_VECTOR) {
> > - kvm_deliver_exception_payload(vcpu);
> > + if (vcpu->arch.exception.vector == DB_VECTOR) {
> > + kvm_deliver_exception_payload(vcpu, &vcpu->arch.exception);
> > if (vcpu->arch.dr7 & DR7_GD) {
> > vcpu->arch.dr7 &= ~DR7_GD;
> > kvm_update_dr7(vcpu);
> > diff --git a/arch/x86/kvm/x86.h b/arch/x86/kvm/x86.h
> > index 501b884b8cc4..dc2af0146220 100644
> > --- a/arch/x86/kvm/x86.h
> > +++ b/arch/x86/kvm/x86.h
> > @@ -286,7 +286,8 @@ int kvm_write_guest_virt_system(struct kvm_vcpu *vcpu,
> >
> > int handle_ud(struct kvm_vcpu *vcpu);
> >
> > -void kvm_deliver_exception_payload(struct kvm_vcpu *vcpu);
> > +void kvm_deliver_exception_payload(struct kvm_vcpu *vcpu,
> > + struct kvm_queued_exception *ex);
> >
> > void kvm_vcpu_mtrr_init(struct kvm_vcpu *vcpu);
> > u8 kvm_mtrr_get_guest_memory_type(struct kvm_vcpu *vcpu, gfn_t gfn);
>
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