On 25/11/2015 17:55, Andrey Smetanin wrote:
>>
>> + gpa = synic->msg_page & PAGE_MASK;
>> + page = kvm_vcpu_gfn_to_page(vcpu, gpa >> PAGE_SHIFT);
>> + if (is_error_page(page)) {
>> + vcpu_err(vcpu, "Hyper-V SynIC can't get msg page, gpa 0x%llx\n",
>> + gpa);
>> + return;
>> + }
>> + msg_page = kmap_atomic(page);
>
> But the message page is not being pinned, is it?
>
> Actually I don't know anything about pinning.
> Is it pinning against page swapping ?
Yes. Unless the page is pinned, kmap_atomic can fail.
However, I don't think that kvm_hv_notify_acked_sint is called from
atomic context. It is only called from apic_set_eoi. Could you just
use kvm_vcpu_write_guest_page?
By the way, do you need to do this also in kvm_get_apic_interrupt, for
auto EOI interrupts?
Thanks,
Paolo
> Could you please clarify and provide an API to use in this case ?
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