From d715cdddb8cdf1c17bf1c5ff8fcc9852cd6ba79e Mon Sep 17 00:00:00 2001 From: Andrew Honig Date: Fri, 29 Mar 2013 09:35:21 -0700 Subject: 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 Signed-off-by: Gleb Natapov Cc: Ben Hutchings Signed-off-by: Greg Kroah-Hartman --- include/linux/kvm_host.h | 2 +- include/linux/kvm_types.h | 1 + 2 files changed, 2 insertions(+), 1 deletion(-) (limited to 'include') 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; }; -- cgit v1.1