UPSTREAM: KVM: use slowpath for cross page cached accesses
[ Upstream commit ca3f0874723fad81d0c701b63ae3a17a408d5f25 ]
kvm_write_guest_cached() does not mark all written pages as dirty and
code comments in kvm_gfn_to_hva_cache_init() talk about NULL memslot
with cross page accesses. Fix all the easy way.
The check is '<= 1' to have the same result for 'len = 0' cache anywhere
in the page. (nr_pages_needed is 0 on page boundary.)
BUG=chromium:846515
TEST=build/boot on hana with USE=kvm_host
Change-Id: I95ffe795f15ef41a22c2e2b7c922d9735c48ee35
Fixes: 8f964525a121 ("KVM: Allow cross page reads and writes from cached translations.")
Signed-off-by: Radim Krm <rkrcmar@redhat.com>
Message-Id: <20150408121648.GA3519@potion.brq.redhat.com>
Reviewed-by: Wanpeng Li <wanpeng.li@linux.intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
(cherry picked from commit 35e1329264c8b2ff71d4c186aabb856710cf9b2f
in https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/)
Signed-off-by: Sonny Rao <sonnyrao@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/1088098
1 file changed
