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authorChristoffer Dall <christoffer.dall@linaro.org>2014-08-19 12:15:00 +0200
committerChristoffer Dall <christoffer.dall@linaro.org>2014-10-02 17:19:11 +0200
commit7ec68cffdc4807a95ae1db300bf857084f0c94da (patch)
treeeac807809a142cb88df7909067cd647375b76c02 /virt
parentae38cfa961f9605be43060001ccc41d39427cb64 (diff)
downloadlinux-linaro-stable-7ec68cffdc4807a95ae1db300bf857084f0c94da.tar.gz
KVM: Introduce gfn_to_hva_memslot_prot
To support read-only memory regions on arm and arm64, we have a need to resolve a gfn to an hva given a pointer to a memslot to avoid looping through the memslots twice and to reuse the hva error checking of gfn_to_hva_prot(), add a new gfn_to_hva_memslot_prot() function and refactor gfn_to_hva_prot() to use this function. Acked-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org> (cherry picked from commit 64d831269ccbca1fc6d739a0f3c8aa24afb43a5e) Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Diffstat (limited to 'virt')
-rw-r--r--virt/kvm/kvm_main.c11
1 files changed, 9 insertions, 2 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 2659da911d99..84cee09da140 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1076,9 +1076,9 @@ EXPORT_SYMBOL_GPL(gfn_to_hva);
* If writable is set to false, the hva returned by this function is only
* allowed to be read.
*/
-unsigned long gfn_to_hva_prot(struct kvm *kvm, gfn_t gfn, bool *writable)
+unsigned long gfn_to_hva_memslot_prot(struct kvm_memory_slot *slot,
+ gfn_t gfn, bool *writable)
{
- struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
unsigned long hva = __gfn_to_hva_many(slot, gfn, NULL, false);
if (!kvm_is_error_hva(hva) && writable)
@@ -1087,6 +1087,13 @@ unsigned long gfn_to_hva_prot(struct kvm *kvm, gfn_t gfn, bool *writable)
return hva;
}
+unsigned long gfn_to_hva_prot(struct kvm *kvm, gfn_t gfn, bool *writable)
+{
+ struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
+
+ return gfn_to_hva_memslot_prot(slot, gfn, writable);
+}
+
static int kvm_read_hva(void *data, void __user *hva, int len)
{
return __copy_from_user(data, hva, len);