diff options
| author |   Suravee Suthikulpanit <suravee.suthikulpanit@amd.com> | 2019-11-14 14:15:16 -0600 |
|---|---|---|
| committer |   Paolo Bonzini <pbonzini@redhat.com> | 2020-02-05 15:17:44 +0100 |
| commit | e2ed4078a6ef3ddf4063329298852e24c36d46c8 (patch) | |
| tree | cdd5efeedb8adb92c7ca4177589065bdd3056954 /arch/x86/include/asm | |
| parent | svm: Temporarily deactivate AVIC during ExtINT handling (diff) | |
| download | linux-dev-e2ed4078a6ef3ddf4063329298852e24c36d46c8.tar.xz linux-dev-e2ed4078a6ef3ddf4063329298852e24c36d46c8.zip | |
kvm: i8254: Deactivate APICv when using in-kernel PIT re-injection mode.
AMD SVM AVIC accelerates EOI write and does not trap. This causes
in-kernel PIT re-injection mode to fail since it relies on irq-ack
notifier mechanism. So, APICv is activated only when in-kernel PIT
is in discard mode e.g. w/ qemu option:
-global kvm-pit.lost_tick_policy=discard
Also, introduce APICV_INHIBIT_REASON_PIT_REINJ bit to be used for this
reason.
Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/include/asm')
| -rw-r--r-- | arch/x86/include/asm/kvm_host.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index 2bd7fd96d994..4dffbc10d3f8 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -879,6 +879,7 @@ enum kvm_irqchip_mode { #define APICV_INHIBIT_REASON_HYPERV 1 #define APICV_INHIBIT_REASON_NESTED 2 #define APICV_INHIBIT_REASON_IRQWIN 3 +#define APICV_INHIBIT_REASON_PIT_REINJ 4 struct kvm_arch { unsigned long n_used_mmu_pages; |