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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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10
include/trace/events/kvm.h
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@@ -296,23 +296,21 @@ DEFINE_EVENT(kvm_async_pf_nopresent_ready, kvm_async_pf_ready,
TRACE_EVENT(
kvm_async_pf_completed,
TP_PROTO(unsigned long address, struct page *page, u64 gva),
TP_ARGS(address, page, gva),
TP_PROTO(unsigned long address, u64 gva),
TP_ARGS(address, gva),
TP_STRUCT__entry(
__field(unsigned long, address)
__field(pfn_t, pfn)
__field(u64, gva)
),
TP_fast_assign(
__entry->address = address;
__entry->pfn = page ? page_to_pfn(page) : 0;
__entry->gva = gva;
),
TP_printk("gva %#llx address %#lx pfn %#llx", __entry->gva,
__entry->address, __entry->pfn)
TP_printk("gva %#llx address %#lx", __entry->gva,
__entry->address)
);
#endif