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authorAndrew Honig <ahonig@google.com>2013-03-29 09:35:21 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-04-25 21:23:48 -0700
commitd715cdddb8cdf1c17bf1c5ff8fcc9852cd6ba79e (patch)
treebd4511997d89bebe33b9395789c8395c017fc93d /include
parent17f13c27702d90899081bf70134132ed5f25158e (diff)
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KVM: Allow cross page reads and writes from cached translations.
commit 8f964525a121f2ff2df948dac908dcc65be21b5b upstream. This patch adds support for kvm_gfn_to_hva_cache_init functions for reads and writes that will cross a page. If the range falls within the same memslot, then this will be a fast operation. If the range is split between two memslots, then the slower kvm_read_guest and kvm_write_guest are used. Tested: Test against kvm_clock unit tests. Signed-off-by: Andrew Honig <ahonig@google.com> Signed-off-by: Gleb Natapov <gleb@redhat.com> Cc: Ben Hutchings <ben@decadent.org.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/kvm_host.h2
-rw-r--r--include/linux/kvm_types.h1
2 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 8663a26..8cd0f20 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -388,7 +388,7 @@ int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
void *data, unsigned long len);
int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
- gpa_t gpa);
+ gpa_t gpa, unsigned long len);
int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len);
int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len);
struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn);
diff --git a/include/linux/kvm_types.h b/include/linux/kvm_types.h
index fa7cc72..b0bcce0 100644
--- a/include/linux/kvm_types.h
+++ b/include/linux/kvm_types.h
@@ -71,6 +71,7 @@ struct gfn_to_hva_cache {
u64 generation;
gpa_t gpa;
unsigned long hva;
+ unsigned long len;
struct kvm_memory_slot *memslot;
};