xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

KVM: Introduce kvm_host_page_size

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

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;