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KVM: Let host know whether the guest can handle async PF in non-userspace context.

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If guest can detect that it runs in non-preemptable context it can
handle async PFs at any time, so let host know that it can send async
PF even if guest cpu is not in userspace.

Acked-by: Rik van Riel <[email protected]>
Signed-off-by: Gleb Natapov <[email protected]>
Signed-off-by: Marcelo Tosatti <[email protected]>
This commit is contained in:
Gleb Natapov 2010-10-14 11:22:55 +02:00 • committed by Avi Kivity
commit 6adba52742
5 changed files with 11 additions and 4 deletions
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5
Documentation/kvm/msr.txt
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@ -154,9 +154,10 @@ MSR_KVM_SYSTEM_TIME: 0x12
MSR_KVM_ASYNC_PF_EN: 0x4b564d02
data: Bits 63-6 hold 64-byte aligned physical address of a
64 byte memory area which must be in guest RAM and must be
zeroed. Bits 5-1 are reserved and should be zero. Bit 0 is 1
zeroed. Bits 5-2 are reserved and should be zero. Bit 0 is 1
when asynchronous page faults are enabled on the vcpu 0 when
disabled.
disabled. Bit 2 is 1 if asynchronous page faults can be injected
when vcpu is in cpl == 0.
First 4 byte of 64 byte memory location will be written to by
the hypervisor at the time of asynchronous page fault (APF)