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authorRadim Krčmář <rkrcmar@redhat.com>2015-04-08 15:16:48 +0300
committerJiri Slaby <jslaby@suse.cz>2015-05-04 12:49:48 +0300
commite6e75e2f847b44e75fee58705ebc01d9567eaaf5 (patch)
tree5d9e8ff416c19224afbd3b3db97b9e22964fa3a2 /virt
parent5239870c49b38d03341ea090e288587d5680cd63 (diff)
downloadlinux-e6e75e2f847b44e75fee58705ebc01d9567eaaf5.tar.xz
KVM: use slowpath for cross page cached accesses
commit ca3f0874723fad81d0c701b63ae3a17a408d5f25 upstream. 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.) Fixes: 8f964525a121 ("KVM: Allow cross page reads and writes from cached translations.") Signed-off-by: Radim Krčmář <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: Jiri Slaby <jslaby@suse.cz>
Diffstat (limited to 'virt')
-rw-r--r--virt/kvm/kvm_main.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index e068d0017fb8..a3510441f7d7 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1540,8 +1540,8 @@ int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
ghc->generation = slots->generation;
ghc->len = len;
ghc->memslot = gfn_to_memslot(kvm, start_gfn);
- ghc->hva = gfn_to_hva_many(ghc->memslot, start_gfn, &nr_pages_avail);
- if (!kvm_is_error_hva(ghc->hva) && nr_pages_avail >= nr_pages_needed) {
+ ghc->hva = gfn_to_hva_many(ghc->memslot, start_gfn, NULL);
+ if (!kvm_is_error_hva(ghc->hva) && nr_pages_needed <= 1) {
ghc->hva += offset;
} else {
/*