Commit 6597ca09 authored by Marcelo Tosatti's avatar Marcelo Tosatti Committed by Avi Kivity
Browse files

KVM: MMU: Fix rmap_write_protect() hugepage iteration bug 



rmap_next() does not work correctly after rmap_remove(), as it expects
the rmap chains not to change during iteration.  Fix (for now) by restarting
iteration from the beginning.

Signed-off-by: default avatarAvi Kivity <avi@qumranet.com>
parent 06e05645

arch/x86/kvm/mmu.c

+1 −0
Original line number Diff line number Diff line
@@ -640,6 +640,7 @@ static void rmap_write_protect(struct kvm *kvm, u64 gfn) 
			rmap_remove(kvm, spte);

			--kvm->stat.lpages;

			set_shadow_pte(spte, shadow_trap_nonpresent_pte);

			spte = NULL;

			write_protected = 1;

		}

		spte = rmap_next(kvm, rmapp, spte);