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| author | Andrey Smetanin <asmetanin@virtuozzo.com> | 2015-11-10 15:36:33 +0300 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2015-11-25 17:24:21 +0100 |
| commit | d62caabb41f33d96333f9ef15e09cd26e1c12760 (patch) | |
| tree | 44e92d54641d6f6c04fc683175bd39ce563ce6fa /arch/x86/kvm/x86.c | |
| parent | 6308630bd3dbb6a8a883c4c571ce5e5a759a8a0e (diff) | |
| download | lwn-d62caabb41f33d96333f9ef15e09cd26e1c12760.tar.gz lwn-d62caabb41f33d96333f9ef15e09cd26e1c12760.zip | |
kvm/x86: per-vcpu apicv deactivation support
The decision on whether to use hardware APIC virtualization used to be
taken globally, based on the availability of the feature in the CPU
and the value of a module parameter.
However, under certain circumstances we want to control it on per-vcpu
basis. In particular, when the userspace activates HyperV synthetic
interrupt controller (SynIC), APICv has to be disabled as it's
incompatible with SynIC auto-EOI behavior.
To achieve that, introduce 'apicv_active' flag on struct
kvm_vcpu_arch, and kvm_vcpu_deactivate_apicv() function to turn APICv
off. The flag is initialized based on the module parameter and CPU
capability, and consulted whenever an APICv-specific action is
performed.
Signed-off-by: Andrey Smetanin <asmetanin@virtuozzo.com>
Reviewed-by: Roman Kagan <rkagan@virtuozzo.com>
Signed-off-by: Denis V. Lunev <den@openvz.org>
CC: Gleb Natapov <gleb@kernel.org>
CC: Paolo Bonzini <pbonzini@redhat.com>
CC: Roman Kagan <rkagan@virtuozzo.com>
CC: Denis V. Lunev <den@openvz.org>
CC: qemu-devel@nongnu.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/x86.c')
| -rw-r--r-- | arch/x86/kvm/x86.c | 19 |
1 files changed, 16 insertions, 3 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 9c69337a3d61..f0250a092ef3 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -2748,7 +2748,9 @@ void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) static int kvm_vcpu_ioctl_get_lapic(struct kvm_vcpu *vcpu, struct kvm_lapic_state *s) { - kvm_x86_ops->sync_pir_to_irr(vcpu); + if (vcpu->arch.apicv_active) + kvm_x86_ops->sync_pir_to_irr(vcpu); + memcpy(s->regs, vcpu->arch.apic->regs, sizeof *s); return 0; @@ -5867,6 +5869,12 @@ static void kvm_pv_kick_cpu_op(struct kvm *kvm, unsigned long flags, int apicid) kvm_irq_delivery_to_apic(kvm, NULL, &lapic_irq, NULL); } +void kvm_vcpu_deactivate_apicv(struct kvm_vcpu *vcpu) +{ + vcpu->arch.apicv_active = false; + kvm_x86_ops->refresh_apicv_exec_ctrl(vcpu); +} + int kvm_emulate_hypercall(struct kvm_vcpu *vcpu) { unsigned long nr, a0, a1, a2, a3, ret; @@ -5960,6 +5968,9 @@ static void update_cr8_intercept(struct kvm_vcpu *vcpu) if (!vcpu->arch.apic) return; + if (vcpu->arch.apicv_active) + return; + if (!vcpu->arch.apic->vapic_addr) max_irr = kvm_lapic_find_highest_irr(vcpu); else @@ -6306,7 +6317,8 @@ static void vcpu_scan_ioapic(struct kvm_vcpu *vcpu) if (irqchip_split(vcpu->kvm)) kvm_scan_ioapic_routes(vcpu, vcpu->arch.ioapic_handled_vectors); else { - kvm_x86_ops->sync_pir_to_irr(vcpu); + if (vcpu->arch.apicv_active) + kvm_x86_ops->sync_pir_to_irr(vcpu); kvm_ioapic_scan_entry(vcpu, vcpu->arch.ioapic_handled_vectors); } kvm_x86_ops->load_eoi_exitmap(vcpu, @@ -6453,7 +6465,7 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu) * Update architecture specific hints for APIC * virtual interrupt delivery. */ - if (kvm_x86_ops->hwapic_irr_update) + if (vcpu->arch.apicv_active) kvm_x86_ops->hwapic_irr_update(vcpu, kvm_lapic_find_highest_irr(vcpu)); } @@ -7524,6 +7536,7 @@ int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu) BUG_ON(vcpu->kvm == NULL); kvm = vcpu->kvm; + vcpu->arch.apicv_active = kvm_x86_ops->get_enable_apicv(); vcpu->arch.pv.pv_unhalted = false; vcpu->arch.emulate_ctxt.ops = &emulate_ops; if (!irqchip_in_kernel(kvm) || kvm_vcpu_is_reset_bsp(vcpu)) |