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| author | Andreas Gruenbacher <agruenba@redhat.com> | 2021-08-02 13:46:19 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-04-15 14:14:40 +0200 |
| commit | 1bca3be5fb8272402d40ac0b25852570fc8fa4f4 (patch) | |
| tree | 64aab2503d418c2442cfb018e06de8a7a91c6bd2 | |
| parent | 92c60ae6f827cf41604eafccbc8608ce4fb41cc1 (diff) | |
| download | linux-stable-1bca3be5fb8272402d40ac0b25852570fc8fa4f4.tar.gz linux-stable-1bca3be5fb8272402d40ac0b25852570fc8fa4f4.tar.bz2 linux-stable-1bca3be5fb8272402d40ac0b25852570fc8fa4f4.zip | |
powerpc/kvm: Fix kvm_use_magic_page
commit 0c8eb2884a42d992c7726539328b7d3568f22143 upstream.
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 <agruenba@redhat.com>
Signed-off-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | arch/powerpc/kernel/kvm.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/kvm.c b/arch/powerpc/kernel/kvm.c index cd381e2291df..2283b9bfd2d1 100644 --- a/arch/powerpc/kernel/kvm.c +++ b/arch/powerpc/kernel/kvm.c @@ -680,7 +680,7 @@ static void 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; } |