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KVM: Get rid of KVM_REQ_KICK

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KVM_REQ_KICK poisons vcpu->requests by having a bit set during normal
operation.  This causes the fast path check for a clear vcpu->requests
to fail all the time, triggering tons of atomic operations.

Fix by replacing KVM_REQ_KICK with a vcpu->guest_mode atomic.

Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Avi Kivity 2010-05-03 16:54:48 +03:00
parent 54b8486f46
commit d94e1dc9af
2 changed files with 11 additions and 7 deletions
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1
include/linux/kvm_host.h
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@ -81,6 +81,7 @@ struct kvm_vcpu {
int vcpu_id;
struct mutex mutex;
int cpu;
atomic_t guest_mode;
struct kvm_run *run;
unsigned long requests;
unsigned long guest_debug;