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authorJoerg Roedel <joerg.roedel@amd.com>2010-01-28 12:37:56 +0100
committerMarcelo Tosatti <mtosatti@redhat.com>2010-03-01 12:36:08 -0300
commit8f0b1ab6fb045a1324d9435ba00c2940783b0041 (patch)
tree34db9f9080cea014150249da16348ed3e3e01fc3
parentc45b4fd416f5497b6b38dd70acc0e5b01399e5c9 (diff)
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KVM: Introduce kvm_host_page_size
This patch introduces a generic function to find out the host page size for a given gfn. This function is needed by the kvm iommu code. This patch also simplifies the x86 host_mapping_level function. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Avi Kivity <avi@redhat.com>
-rw-r--r--arch/x86/kvm/mmu.c18
-rw-r--r--include/linux/kvm_host.h1
-rw-r--r--virt/kvm/kvm_main.c25
3 files changed, 28 insertions, 16 deletions
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index dc4d954efac..913ef4b7939 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -468,24 +468,10 @@ static int has_wrprotected_page(struct kvm *kvm,
static int host_mapping_level(struct kvm *kvm, gfn_t gfn)
{
- unsigned long page_size = PAGE_SIZE;
- struct vm_area_struct *vma;
- unsigned long addr;
+ unsigned long page_size;
int i, ret = 0;
- addr = gfn_to_hva(kvm, gfn);
- if (kvm_is_error_hva(addr))
- return PT_PAGE_TABLE_LEVEL;
-
- down_read(&current->mm->mmap_sem);
- vma = find_vma(current->mm, addr);
- if (!vma)
- goto out;
-
- page_size = vma_kernel_pagesize(vma);
-
-out:
- up_read(&current->mm->mmap_sem);
+ page_size = kvm_host_page_size(kvm, gfn);
for (i = PT_PAGE_TABLE_LEVEL;
i < (PT_PAGE_TABLE_LEVEL + KVM_NR_PAGE_SIZES); ++i) {
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 665c37063f3..3145b281de9 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -300,6 +300,7 @@ 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);
int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn);
+unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn);
void mark_page_dirty(struct kvm *kvm, gfn_t gfn);
void kvm_vcpu_block(struct kvm_vcpu *vcpu);
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 2b0974a1483..0a360c26cc3 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -45,6 +45,7 @@
#include <linux/spinlock.h>
#include <linux/compat.h>
#include <linux/srcu.h>
+#include <linux/hugetlb.h>
#include <asm/processor.h>
#include <asm/io.h>
@@ -867,6 +868,30 @@ int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn)
}
EXPORT_SYMBOL_GPL(kvm_is_visible_gfn);
+unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn)
+{
+ struct vm_area_struct *vma;
+ unsigned long addr, size;
+
+ size = PAGE_SIZE;
+
+ addr = gfn_to_hva(kvm, gfn);
+ if (kvm_is_error_hva(addr))
+ return PAGE_SIZE;
+
+ down_read(&current->mm->mmap_sem);
+ vma = find_vma(current->mm, addr);
+ if (!vma)
+ goto out;
+
+ size = vma_kernel_pagesize(vma);
+
+out:
+ up_read(&current->mm->mmap_sem);
+
+ return size;
+}
+
int memslot_id(struct kvm *kvm, gfn_t gfn)
{
int i;