mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 17:30:02 +00:00
KVM: MMU: check kvm_mmu_pages and mmu_page_path indices
Give a special invalid index to the root of the walk, so that we can check the consistency of kvm_mmu_pages and mmu_page_path. Signed-off-by: Xiao Guangrong <guangrong.xiao@linux.intel.com> [Extracted from a bigger patch proposed by Guangrong. - Paolo] Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
parent
0a47cd8583
commit
e23d3fef83
1 changed files with 6 additions and 1 deletions
|
@ -1870,6 +1870,8 @@ static int __mmu_unsync_walk(struct kvm_mmu_page *sp,
|
|||
return nr_unsync_leaf;
|
||||
}
|
||||
|
||||
#define INVALID_INDEX (-1)
|
||||
|
||||
static int mmu_unsync_walk(struct kvm_mmu_page *sp,
|
||||
struct kvm_mmu_pages *pvec)
|
||||
{
|
||||
|
@ -1877,7 +1879,7 @@ static int mmu_unsync_walk(struct kvm_mmu_page *sp,
|
|||
if (!sp->unsync_children)
|
||||
return 0;
|
||||
|
||||
mmu_pages_add(pvec, sp, 0);
|
||||
mmu_pages_add(pvec, sp, INVALID_INDEX);
|
||||
return __mmu_unsync_walk(sp, pvec);
|
||||
}
|
||||
|
||||
|
@ -2026,6 +2028,8 @@ static int mmu_pages_first(struct kvm_mmu_pages *pvec,
|
|||
if (pvec->nr == 0)
|
||||
return 0;
|
||||
|
||||
WARN_ON(pvec->page[0].idx != INVALID_INDEX);
|
||||
|
||||
sp = pvec->page[0].sp;
|
||||
level = sp->role.level;
|
||||
WARN_ON(level == PT_PAGE_TABLE_LEVEL);
|
||||
|
@ -2050,6 +2054,7 @@ static void mmu_pages_clear_parents(struct mmu_page_path *parents)
|
|||
if (!sp)
|
||||
return;
|
||||
|
||||
WARN_ON(idx == INVALID_INDEX);
|
||||
clear_unsync_child_bit(sp, idx);
|
||||
level++;
|
||||
} while (!sp->unsync_children);
|
||||
|
|
Loading…
Reference in a new issue