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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/svm.c | |
| parent | 6308630bd3dbb6a8a883c4c571ce5e5a759a8a0e (diff) | |
| download | op-kernel-dev-d62caabb41f33d96333f9ef15e09cd26e1c12760.zip op-kernel-dev-d62caabb41f33d96333f9ef15e09cd26e1c12760.tar.gz | |
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/svm.c')
| -rw-r--r-- | arch/x86/kvm/svm.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index ebb76e8..2401fc8 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -3559,9 +3559,13 @@ static void svm_set_virtual_x2apic_mode(struct kvm_vcpu *vcpu, bool set) return; } -static int svm_cpu_uses_apicv(struct kvm_vcpu *vcpu) +static bool svm_get_enable_apicv(void) +{ + return false; +} + +static void svm_refresh_apicv_exec_ctrl(struct kvm_vcpu *vcpu) { - return 0; } static void svm_load_eoi_exitmap(struct kvm_vcpu *vcpu, u64 *eoi_exit_bitmap) @@ -4328,7 +4332,8 @@ static struct kvm_x86_ops svm_x86_ops = { .enable_irq_window = enable_irq_window, .update_cr8_intercept = update_cr8_intercept, .set_virtual_x2apic_mode = svm_set_virtual_x2apic_mode, - .cpu_uses_apicv = svm_cpu_uses_apicv, + .get_enable_apicv = svm_get_enable_apicv, + .refresh_apicv_exec_ctrl = svm_refresh_apicv_exec_ctrl, .load_eoi_exitmap = svm_load_eoi_exitmap, .sync_pir_to_irr = svm_sync_pir_to_irr, |
