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Commit 11dc8286 authored by Andreas Gruenbacher's avatar Andreas Gruenbacher Committed by Greg Kroah-Hartman
Browse files

powerpc/kvm: Fix kvm_use_magic_page 



commit 0c8eb2884a42d992c7726539328b7d3568f22143 upstream.

When switching from __get_user to fault_in_pages_readable, commit
9f9eae5c broke kvm_use_magic_page: like __get_user,
fault_in_pages_readable returns 0 on success.

Fixes: 9f9eae5c ("powerpc/kvm: Prefer fault_in_pages_readable function")
Cc: stable@vger.kernel.org # v4.18+
Signed-off-by: default avatarAndreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: default avatarAnand Jain <anand.jain@oracle.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent ded62776

arch/powerpc/kernel/kvm.c

+1 −1
Original line number Diff line number Diff line
@@ -669,7 +669,7 @@ static void __init kvm_use_magic_page(void) 
	on_each_cpu(kvm_map_magic_page, &features, 1);



	/* Quick self-test to see if the mapping works */

	if (!fault_in_pages_readable((const char *)KVM_MAGIC_PAGE, sizeof(u32))) {

	if (fault_in_pages_readable((const char *)KVM_MAGIC_PAGE, sizeof(u32))) {

		kvm_patching_worked = false;

		return;

	}