The patch titled
KVM: MMU: Treat user-mode faults as a hint that a page is no longer a page table
has been removed from the -mm tree. Its filename was
kvm-mmu-treat-user-mode-faults-as-a-hint-that-a-page-is-no-longer-a-page-table.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
Subject: KVM: MMU: Treat user-mode faults as a hint that a page is no longer a page table
From: Avi Kivity <avi@xxxxxxxxxxxx>
Signed-off-by: Avi Kivity <avi@xxxxxxxxxxxx>
Acked-by: Ingo Molnar <mingo@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
drivers/kvm/paging_tmpl.h | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)
diff -puN drivers/kvm/paging_tmpl.h~kvm-mmu-treat-user-mode-faults-as-a-hint-that-a-page-is-no-longer-a-page-table drivers/kvm/paging_tmpl.h
--- a/drivers/kvm/paging_tmpl.h~kvm-mmu-treat-user-mode-faults-as-a-hint-that-a-page-is-no-longer-a-page-table
+++ a/drivers/kvm/paging_tmpl.h
@@ -271,6 +271,7 @@ static int FNAME(fix_write_pf)(struct kv
pt_element_t *guest_ent;
int writable_shadow;
gfn_t gfn;
+ struct kvm_mmu_page *page;
if (is_writeble_pte(*shadow_ent))
return 0;
@@ -303,7 +304,17 @@ static int FNAME(fix_write_pf)(struct kv
}
gfn = walker->gfn;
- if (kvm_mmu_lookup_page(vcpu, gfn)) {
+
+ if (user) {
+ /*
+ * Usermode page faults won't be for page table updates.
+ */
+ while ((page = kvm_mmu_lookup_page(vcpu, gfn)) != NULL) {
+ pgprintk("%s: zap %lx %x\n",
+ __FUNCTION__, gfn, page->role.word);
+ kvm_mmu_zap_page(vcpu, page);
+ }
+ } else if (kvm_mmu_lookup_page(vcpu, gfn)) {
pgprintk("%s: found shadow page for %lx, marking ro\n",
__FUNCTION__, gfn);
*write_pt = 1;
_
Patches currently in -mm which might be from avi@xxxxxxxxxxxx are
-
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