From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andreas Gruenbacher Date: Tue, 19 Oct 2021 13:41:49 +0000 Subject: [PATCH v8 02/17] powerpc/kvm: Fix kvm_use_magic_page Message-Id: <20211019134204.3382645-3-agruenba@redhat.com> List-Id: References: <20211019134204.3382645-1-agruenba@redhat.com> In-Reply-To: <20211019134204.3382645-1-agruenba@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Linus Torvalds , Catalin Marinas , Paul Mackerras Cc: Alexander Viro , Christoph Hellwig , "Darrick J. Wong" , Jan Kara , Matthew Wilcox , cluster-devel@redhat.com, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, ocfs2-devel@oss.oracle.com, kvm-ppc@vger.kernel.org, linux-btrfs@vger.kernel.org, Andreas Gruenbacher , stable@vger.kernel.org When switching from __get_user to fault_in_pages_readable, commit 9f9eae5ce717 broke kvm_use_magic_page: like __get_user, fault_in_pages_readable returns 0 on success. Fixes: 9f9eae5ce717 ("powerpc/kvm: Prefer fault_in_pages_readable function") Cc: stable@vger.kernel.org # v4.18+ Signed-off-by: Andreas Gruenbacher --- arch/powerpc/kernel/kvm.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/powerpc/kernel/kvm.c b/arch/powerpc/kernel/kvm.c index 617eba82531c..d89cf802d9aa 100644 --- a/arch/powerpc/kernel/kvm.c +++ b/arch/powerpc/kernel/kvm.c @@ -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; } -- 2.26.3