From be7486f6e0d028cdbe6108349bde8a98323c4ad2 Mon Sep 17 00:00:00 2001 From: Sean Christopherson Date: Fri, 7 Jun 2024 10:26:08 -0700 Subject: [PATCH] KVM: nVMX: Fold requested virtual interrupt check into has_nested_events() commit 321ef62b0c5f6f57bb8500a2ca5986052675abbf upstream. Check for a Requested Virtual Interrupt, i.e. a virtual interrupt that is pending delivery, in vmx_has_nested_events() and drop the one-off kvm_x86_ops.guest_apic_has_interrupt() hook. In addition to dropping a superfluous hook, this fixes a bug where KVM would incorrectly treat virtual interrupts _for L2_ as always enabled due to kvm_arch_interrupt_allowed(), by way of vmx_interrupt_blocked(), treating IRQs as enabled if L2 is active and vmcs12 is configured to exit on IRQs, i.e. KVM would treat a virtual interrupt for L2 as a valid wake event based on L1's IRQ blocking status. Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20240607172609.3205077-6-seanjc@google.com Signed-off-by: Sean Christopherson Signed-off-by: Greg Kroah-Hartman --- arch/x86/include/asm/kvm-x86-ops.h | 1 - arch/x86/include/asm/kvm_host.h | 1 - arch/x86/kvm/vmx/main.c | 1 - arch/x86/kvm/vmx/nested.c | 4 ++++ arch/x86/kvm/vmx/vmx.c | 20 -------------------- arch/x86/kvm/vmx/x86_ops.h | 1 - arch/x86/kvm/x86.c | 10 +--------- 7 files changed, 5 insertions(+), 33 deletions(-) diff --git a/arch/x86/include/asm/kvm-x86-ops.h b/arch/x86/include/asm/kvm-x86-ops.h index 5187fcf4b610..8d5a2b4f5f00 100644 --- a/arch/x86/include/asm/kvm-x86-ops.h +++ b/arch/x86/include/asm/kvm-x86-ops.h @@ -85,7 +85,6 @@ KVM_X86_OP_OPTIONAL(update_cr8_intercept) KVM_X86_OP(refresh_apicv_exec_ctrl) KVM_X86_OP_OPTIONAL(hwapic_irr_update) KVM_X86_OP_OPTIONAL(hwapic_isr_update) -KVM_X86_OP_OPTIONAL_RET0(guest_apic_has_interrupt) KVM_X86_OP_OPTIONAL(load_eoi_exitmap) KVM_X86_OP_OPTIONAL(set_virtual_apic_mode) KVM_X86_OP_OPTIONAL(set_apic_access_page_addr) diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index 332347d014c2..d0274b3be2c4 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -1714,7 +1714,6 @@ struct kvm_x86_ops { void (*refresh_apicv_exec_ctrl)(struct kvm_vcpu *vcpu); void (*hwapic_irr_update)(struct kvm_vcpu *vcpu, int max_irr); void (*hwapic_isr_update)(int isr); - bool (*guest_apic_has_interrupt)(struct kvm_vcpu *vcpu); void (*load_eoi_exitmap)(struct kvm_vcpu *vcpu, u64 *eoi_exit_bitmap); void (*set_virtual_apic_mode)(struct kvm_vcpu *vcpu); void (*set_apic_access_page_addr)(struct kvm_vcpu *vcpu); diff --git a/arch/x86/kvm/vmx/main.c b/arch/x86/kvm/vmx/main.c index d4ed681785fd..547fca3709fe 100644 --- a/arch/x86/kvm/vmx/main.c +++ b/arch/x86/kvm/vmx/main.c @@ -97,7 +97,6 @@ struct kvm_x86_ops vt_x86_ops __initdata = { .required_apicv_inhibits = VMX_REQUIRED_APICV_INHIBITS, .hwapic_irr_update = vmx_hwapic_irr_update, .hwapic_isr_update = vmx_hwapic_isr_update, - .guest_apic_has_interrupt = vmx_guest_apic_has_interrupt, .sync_pir_to_irr = vmx_sync_pir_to_irr, .deliver_interrupt = vmx_deliver_interrupt, .dy_apicv_has_pending_interrupt = pi_has_pending_interrupt, diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c index 732340ff3300..7c57d6524f75 100644 --- a/arch/x86/kvm/vmx/nested.c +++ b/arch/x86/kvm/vmx/nested.c @@ -4060,6 +4060,10 @@ static bool vmx_has_nested_events(struct kvm_vcpu *vcpu, bool for_injection) vppr = *((u32 *)(vapic + APIC_PROCPRI)); + max_irr = vmx_get_rvi(); + if ((max_irr & 0xf0) > (vppr & 0xf0)) + return true; + if (vmx->nested.pi_pending && vmx->nested.pi_desc && pi_test_on(vmx->nested.pi_desc)) { max_irr = pi_find_highest_vector(vmx->nested.pi_desc); diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index 6f240638e145..2792c5086977 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -4108,26 +4108,6 @@ void pt_update_intercept_for_msr(struct kvm_vcpu *vcpu) } } -bool vmx_guest_apic_has_interrupt(struct kvm_vcpu *vcpu) -{ - struct vcpu_vmx *vmx = to_vmx(vcpu); - void *vapic_page; - u32 vppr; - int rvi; - - if (WARN_ON_ONCE(!is_guest_mode(vcpu)) || - !nested_cpu_has_vid(get_vmcs12(vcpu)) || - WARN_ON_ONCE(!vmx->nested.virtual_apic_map.gfn)) - return false; - - rvi = vmx_get_rvi(); - - vapic_page = vmx->nested.virtual_apic_map.hva; - vppr = *((u32 *)(vapic_page + APIC_PROCPRI)); - - return ((rvi & 0xf0) > (vppr & 0xf0)); -} - void vmx_msr_filter_changed(struct kvm_vcpu *vcpu) { struct vcpu_vmx *vmx = to_vmx(vcpu); diff --git a/arch/x86/kvm/vmx/x86_ops.h b/arch/x86/kvm/vmx/x86_ops.h index 502704596c83..d404227c164d 100644 --- a/arch/x86/kvm/vmx/x86_ops.h +++ b/arch/x86/kvm/vmx/x86_ops.h @@ -49,7 +49,6 @@ void vmx_apicv_pre_state_restore(struct kvm_vcpu *vcpu); bool vmx_check_apicv_inhibit_reasons(enum kvm_apicv_inhibit reason); void vmx_hwapic_irr_update(struct kvm_vcpu *vcpu, int max_irr); void vmx_hwapic_isr_update(int max_isr); -bool vmx_guest_apic_has_interrupt(struct kvm_vcpu *vcpu); int vmx_sync_pir_to_irr(struct kvm_vcpu *vcpu); void vmx_deliver_interrupt(struct kvm_lapic *apic, int delivery_mode, int trig_mode, int vector); diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 369a4a300083..0b7adf3bc58a 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -13100,12 +13100,6 @@ void kvm_arch_commit_memory_region(struct kvm *kvm, kvm_arch_free_memslot(kvm, old); } -static inline bool kvm_guest_apic_has_interrupt(struct kvm_vcpu *vcpu) -{ - return (is_guest_mode(vcpu) && - static_call(kvm_x86_guest_apic_has_interrupt)(vcpu)); -} - static inline bool kvm_vcpu_has_events(struct kvm_vcpu *vcpu) { if (!list_empty_careful(&vcpu->async_pf.done)) @@ -13136,9 +13130,7 @@ static inline bool kvm_vcpu_has_events(struct kvm_vcpu *vcpu) if (kvm_test_request(KVM_REQ_PMI, vcpu)) return true; - if (kvm_arch_interrupt_allowed(vcpu) && - (kvm_cpu_has_interrupt(vcpu) || - kvm_guest_apic_has_interrupt(vcpu))) + if (kvm_arch_interrupt_allowed(vcpu) && kvm_cpu_has_interrupt(vcpu)) return true; if (kvm_hv_has_stimer_pending(vcpu))