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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>
This commit is contained in:
Joerg Roedel 2010-01-28 12:37:56 +01:00 committed by Marcelo Tosatti
parent c45b4fd416
commit 8f0b1ab6fb
3 changed files with 28 additions and 16 deletions
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18
arch/x86/kvm/mmu.c
View File

@ -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) {

1
include/linux/kvm_host.h
View File

@ -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);

25
virt/kvm/kvm_main.c
View File

@ -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;