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KVM: Drop FOLL_GET in GUP when doing async page fault

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Page pinning is not mandatory in kvm async page fault processing since
after async page fault event is delivered to a guest it accesses page once
again and does its own GUP.  Drop the FOLL_GET flag in GUP in async_pf
code, and do some simplifying in check/clear processing.

Suggested-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Gu zheng <guz.fnst@cn.fujitsu.com>
Signed-off-by: chai wen <chaiw.fnst@cn.fujitsu.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
This commit is contained in:
chai wen 2013-10-14 22:22:33 +08:00 • committed by Gleb Natapov
parent a7efdf6bec
commit f2e106692d
4 changed files with 12 additions and 21 deletions
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include/linux/kvm_host.h
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@ -189,7 +189,7 @@ struct kvm_async_pf {
gva_t gva;
unsigned long addr;
struct kvm_arch_async_pf arch;
struct page *page;
bool wakeup_all;
};
void kvm_clear_async_pf_completion_queue(struct kvm_vcpu *vcpu);