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KVM: make make_all_cpus_request() lockless

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Now, we have 'vcpu->mode' to judge whether need to send ipi to other
cpus, this way is very exact, so checking request bit is needless,
then we can drop the spinlock let it's collateral

Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Xiao Guangrong 2011-01-12 15:41:22 +08:00 • committed by Marcelo Tosatti
commit 3cba41307a
2 changed files with 3 additions and 12 deletions
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6
include/linux/kvm_host.h
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@ -224,7 +224,6 @@ struct kvm_memslots {
struct kvm {
spinlock_t mmu_lock;
raw_spinlock_t requests_lock;
struct mutex slots_lock;
struct mm_struct *mm; /* userspace tied to this vm */
struct kvm_memslots *memslots;
@ -731,11 +730,6 @@ static inline void kvm_make_request(int req, struct kvm_vcpu *vcpu)
set_bit(req, &vcpu->requests);
}
static inline bool kvm_make_check_request(int req, struct kvm_vcpu *vcpu)
{
return test_and_set_bit(req, &vcpu->requests);
}
static inline bool kvm_check_request(int req, struct kvm_vcpu *vcpu)
{
if (test_bit(req, &vcpu->requests)) {