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| author | Maxim Levitsky <mlevitsk@redhat.com> | 2022-03-22 19:40:49 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2022-04-02 05:41:24 -0400 |
| commit | d5fa597ed87047117dc62ce1d38ba1d007442359 (patch) | |
| tree | 0ee1571cd632e90801efa77e44a91672cb011bd9 | |
| parent | 0b349662184ba76b335af84579f3ed50baf54607 (diff) | |
| download | linux-d5fa597ed87047117dc62ce1d38ba1d007442359.tar.gz linux-d5fa597ed87047117dc62ce1d38ba1d007442359.tar.bz2 linux-d5fa597ed87047117dc62ce1d38ba1d007442359.zip | |
KVM: x86: allow per cpu apicv inhibit reasons
Add optional callback .vcpu_get_apicv_inhibit_reasons returning
extra inhibit reasons that prevent APICv from working on this vCPU.
Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
Message-Id: <20220322174050.241850-6-mlevitsk@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| -rw-r--r-- | arch/x86/include/asm/kvm-x86-ops.h | 1 | ||||
| -rw-r--r-- | arch/x86/include/asm/kvm_host.h | 6 | ||||
| -rw-r--r-- | arch/x86/kvm/x86.c | 13 |
3 files changed, 18 insertions, 2 deletions
diff --git a/arch/x86/include/asm/kvm-x86-ops.h b/arch/x86/include/asm/kvm-x86-ops.h index 3c368b639c04..96e4e9842dfc 100644 --- a/arch/x86/include/asm/kvm-x86-ops.h +++ b/arch/x86/include/asm/kvm-x86-ops.h @@ -126,6 +126,7 @@ KVM_X86_OP_OPTIONAL(migrate_timers) KVM_X86_OP(msr_filter_changed) KVM_X86_OP(complete_emulated_msr) KVM_X86_OP(vcpu_deliver_sipi_vector) +KVM_X86_OP_OPTIONAL_RET0(vcpu_get_apicv_inhibit_reasons); #undef KVM_X86_OP #undef KVM_X86_OP_OPTIONAL diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index fac990cc189d..676705ad1e23 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -1507,6 +1507,11 @@ struct kvm_x86_ops { int (*complete_emulated_msr)(struct kvm_vcpu *vcpu, int err); void (*vcpu_deliver_sipi_vector)(struct kvm_vcpu *vcpu, u8 vector); + + /* + * Returns vCPU specific APICv inhibit reasons + */ + unsigned long (*vcpu_get_apicv_inhibit_reasons)(struct kvm_vcpu *vcpu); }; struct kvm_x86_nested_ops { @@ -1807,6 +1812,7 @@ gpa_t kvm_mmu_gva_to_gpa_system(struct kvm_vcpu *vcpu, gva_t gva, struct x86_exception *exception); bool kvm_apicv_activated(struct kvm *kvm); +bool kvm_vcpu_apicv_activated(struct kvm_vcpu *vcpu); void kvm_vcpu_update_apicv(struct kvm_vcpu *vcpu); void __kvm_set_or_clear_apicv_inhibit(struct kvm *kvm, enum kvm_apicv_inhibit reason, bool set); diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index dad13fd6b61e..cb9c0197c414 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -9114,6 +9114,14 @@ bool kvm_apicv_activated(struct kvm *kvm) } EXPORT_SYMBOL_GPL(kvm_apicv_activated); +bool kvm_vcpu_apicv_activated(struct kvm_vcpu *vcpu) +{ + ulong vm_reasons = READ_ONCE(vcpu->kvm->arch.apicv_inhibit_reasons); + ulong vcpu_reasons = static_call(kvm_x86_vcpu_get_apicv_inhibit_reasons)(vcpu); + + return (vm_reasons | vcpu_reasons) == 0; +} +EXPORT_SYMBOL_GPL(kvm_vcpu_apicv_activated); static void set_or_clear_apicv_inhibit(unsigned long *inhibits, enum kvm_apicv_inhibit reason, bool set) @@ -9799,7 +9807,8 @@ void kvm_vcpu_update_apicv(struct kvm_vcpu *vcpu) down_read(&vcpu->kvm->arch.apicv_update_lock); - activate = kvm_apicv_activated(vcpu->kvm); + activate = kvm_vcpu_apicv_activated(vcpu); + if (vcpu->arch.apicv_active == activate) goto out; @@ -10200,7 +10209,7 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu) * per-VM state, and responsing vCPUs must wait for the update * to complete before servicing KVM_REQ_APICV_UPDATE. */ - WARN_ON_ONCE(kvm_apicv_activated(vcpu->kvm) != kvm_vcpu_apicv_active(vcpu)); + WARN_ON_ONCE(kvm_vcpu_apicv_activated(vcpu) != kvm_vcpu_apicv_active(vcpu)); exit_fastpath = static_call(kvm_x86_vcpu_run)(vcpu); if (likely(exit_fastpath != EXIT_FASTPATH_REENTER_GUEST)) |