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[PATCH] kvm: Fix gva_to_gpa()

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gva_to_gpa() needs to be updated to the new walk_addr() calling convention,
otherwise it may oops under some circumstances.

Use the opportunity to remove all the code duplication in gva_to_gpa(), which
essentially repeats the calculations in walk_addr().

Signed-off-by: Avi Kivity <avi@qumranet.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Avi Kivity 2007-02-12 00:54:36 -08:00 committed by Linus Torvalds
parent a0610ddf6b
commit e119d117a1
1 changed files with 7 additions and 21 deletions
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28
drivers/kvm/paging_tmpl.h
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@ -443,31 +443,17 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gva_t addr,
static gpa_t FNAME(gva_to_gpa)(struct kvm_vcpu *vcpu, gva_t vaddr)
{
struct guest_walker walker;
pt_element_t guest_pte;
gpa_t gpa;
gpa_t gpa = UNMAPPED_GVA;
int r;
FNAME(walk_addr)(&walker, vcpu, vaddr, 0, 0, 0);
guest_pte = *walker.ptep;
FNAME(release_walker)(&walker);
r = FNAME(walk_addr)(&walker, vcpu, vaddr, 0, 0, 0);
if (!is_present_pte(guest_pte))
return UNMAPPED_GVA;
if (walker.level == PT_DIRECTORY_LEVEL) {
ASSERT((guest_pte & PT_PAGE_SIZE_MASK));
ASSERT(PTTYPE == 64 || is_pse(vcpu));
gpa = (guest_pte & PT_DIR_BASE_ADDR_MASK) | (vaddr &
(PT_LEVEL_MASK(PT_PAGE_TABLE_LEVEL) | ~PAGE_MASK));
if (PTTYPE == 32 && is_cpuid_PSE36())
gpa |= (guest_pte & PT32_DIR_PSE36_MASK) <<
(32 - PT32_DIR_PSE36_SHIFT);
} else {
gpa = (guest_pte & PT_BASE_ADDR_MASK);
gpa |= (vaddr & ~PAGE_MASK);
if (r) {
gpa = (gpa_t)walker.gfn << PAGE_SHIFT;
gpa |= vaddr & ~PAGE_MASK;
}
FNAME(release_walker)(&walker);
return gpa;
}