On 10/07/2010 07:59 PM, Gleb Natapov wrote:
On Thu, Oct 07, 2010 at 02:58:26PM +0200, Avi Kivity wrote: > On 10/04/2010 05:56 PM, Gleb Natapov wrote: > >+ > >+ Physical address points to 32 bit memory location that will be written > >+ to by the hypervisor at the time of asynchronous page fault injection to > >+ indicate type of asynchronous page fault. Value of 1 means that the page > >+ referred to by the page fault is not present. Value 2 means that the > >+ page is now available. > > "The must not enable interrupts before the reason is read, or it may > be overwritten by another apf". > > Document the fact that disabling interrupts disables APFs. > > How does the guest distinguish betweem APFs and ordinary page faults? > > What's the role of cr2? > > When disabling APF, all pending APFs are flushed and may or may not > get a completion. > > Is a "page available" notification guaranteed to arrive on the same > vcpu that took the "page not present" fault? > You mean documentation is lacking? :)
I mean you should be able to write guest support code without reading the host code, just the documentation.
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