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author | Joerg Roedel <joerg.roedel@amd.com> | 2010-01-28 12:37:56 +0100 |
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committer | Marcelo Tosatti <mtosatti@redhat.com> | 2010-03-01 12:36:08 -0300 |
commit | 8f0b1ab6fb045a1324d9435ba00c2940783b0041 (patch) | |
tree | 34db9f9080cea014150249da16348ed3e3e01fc3 /virt | |
parent | c45b4fd416f5497b6b38dd70acc0e5b01399e5c9 (diff) | |
download | kernel_samsung_crespo-8f0b1ab6fb045a1324d9435ba00c2940783b0041.zip kernel_samsung_crespo-8f0b1ab6fb045a1324d9435ba00c2940783b0041.tar.gz kernel_samsung_crespo-8f0b1ab6fb045a1324d9435ba00c2940783b0041.tar.bz2 |
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>
Diffstat (limited to 'virt')
-rw-r--r-- | virt/kvm/kvm_main.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 2b0974a..0a360c2 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(¤t->mm->mmap_sem); + vma = find_vma(current->mm, addr); + if (!vma) + goto out; + + size = vma_kernel_pagesize(vma); + +out: + up_read(¤t->mm->mmap_sem); + + return size; +} + int memslot_id(struct kvm *kvm, gfn_t gfn) { int i; |