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)