On Tue, Mar 31, 2009 at 03:00:03AM +0300, Izik Eidus wrote:
> this flag notify that the host physical page we are pointing to from
> the spte is write protected, and therefore we cant change its access
> to be write unless we run get_user_pages(write = 1).
>
> (this is needed for change_pte support in kvm)
>
> Signed-off-by: Izik Eidus <[email protected]>
> @@ -547,6 +551,7 @@ static void FNAME(prefetch_page)(struct kvm_vcpu *vcpu,
> static int FNAME(sync_page)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp)
> {
> int i, offset, nr_present;
> + bool reset_host_protection = 1;
>
> offset = nr_present = 0;
>
> @@ -584,9 +589,14 @@ static int FNAME(sync_page)(struct kvm_vcpu *vcpu,
> struct kvm_mmu_page *sp)
>
> nr_present++;
> pte_access = sp->role.access & FNAME(gpte_access)(vcpu, gpte);
> + if (!(sp->spt[i] & SPTE_HOST_WRITEABLE)) {
> + pte_access &= ~PT_WRITABLE_MASK;
> + reset_host_protection = 0;
> + }
else
reset_host_protection = 1;
Otherwise you clear SPTE_HOST_WRITEABLE for all sptes once you find a
single one thats unset.
Also mind the tabs.
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