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| author |   Paolo Bonzini <pbonzini@redhat.com> | 2017-04-27 14:33:43 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2017-04-27 14:36:44 +0200 |
| commit | 7a97cec26b94c909f4cbad2dc3186af3e457a522 (patch) | |
| tree | ce711b80c36bb3c2828cc63b9f65187fa95e2305 /include/linux/kvm_host.h | |
| parent | KVM: return if kvm_vcpu_wake_up() did wake up the VCPU (diff) | |
| download | linux-dev-7a97cec26b94c909f4cbad2dc3186af3e457a522.tar.xz linux-dev-7a97cec26b94c909f4cbad2dc3186af3e457a522.zip | |
KVM: mark requests that need synchronization
kvm_make_all_requests() provides a synchronization that waits until all
kicked VCPUs have acknowledged the kick. This is important for
KVM_REQ_MMU_RELOAD as it prevents freeing while lockless paging is
underway.
This patch adds the synchronization property into all requests that are
currently being used with kvm_make_all_requests() in order to preserve
the current behavior and only introduce a new framework. Removing it
from requests where it is not necessary is left for future patches.
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'include/linux/kvm_host.h')
| -rw-r--r-- | include/linux/kvm_host.h | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index f4a2c00092f8..a5bfffa8c8d4 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -117,14 +117,15 @@ static inline bool is_error_page(struct page *page) #define KVM_REQUEST_MASK GENMASK(7,0) #define KVM_REQUEST_NO_WAKEUP BIT(8) +#define KVM_REQUEST_WAIT BIT(9) /* * Architecture-independent vcpu->requests bit members * Bits 4-7 are reserved for more arch-independent bits. */ -#define KVM_REQ_TLB_FLUSH (0 | KVM_REQUEST_NO_WAKEUP) -#define KVM_REQ_MMU_RELOAD (1 | KVM_REQUEST_NO_WAKEUP) -#define KVM_REQ_PENDING_TIMER 2 -#define KVM_REQ_UNHALT 3 +#define KVM_REQ_TLB_FLUSH (0 | KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP) +#define KVM_REQ_MMU_RELOAD (1 | KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP) +#define KVM_REQ_PENDING_TIMER 2 +#define KVM_REQ_UNHALT 3 #define KVM_USERSPACE_IRQ_SOURCE_ID 0 #define KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID 1 |