The patch titled
KVM: MMU: Flush guest tlb when reducing permissions on a pte
has been removed from the -mm tree. Its filename was
kvm-mmu-flush-guest-tlb-when-reducing-permissions-on-a-pte.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
Subject: KVM: MMU: Flush guest tlb when reducing permissions on a pte
From: Avi Kivity <avi@xxxxxxxxxxxx>
If we reduce permissions on a pte, we must flush the cached copy of the pte
from the guest's tlb.
This is implemented at the moment by flushing the entire guest tlb, and can be
improved by flushing just the relevant virtual address, if it is known.
Signed-off-by: Avi Kivity <avi@xxxxxxxxxxxx>
Acked-by: Ingo Molnar <mingo@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
drivers/kvm/mmu.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff -puN drivers/kvm/mmu.c~kvm-mmu-flush-guest-tlb-when-reducing-permissions-on-a-pte drivers/kvm/mmu.c
--- a/drivers/kvm/mmu.c~kvm-mmu-flush-guest-tlb-when-reducing-permissions-on-a-pte
+++ a/drivers/kvm/mmu.c
@@ -383,6 +383,7 @@ static void rmap_write_protect(struct kv
BUG_ON(!(*spte & PT_WRITABLE_MASK));
rmap_printk("rmap_write_protect: spte %p %llx\n", spte, *spte);
rmap_remove(vcpu, spte);
+ kvm_arch_ops->tlb_flush(vcpu);
*spte &= ~(u64)PT_WRITABLE_MASK;
}
}
@@ -594,6 +595,7 @@ static void kvm_mmu_page_unlink_children
rmap_remove(vcpu, &pt[i]);
pt[i] = 0;
}
+ kvm_arch_ops->tlb_flush(vcpu);
return;
}
@@ -927,7 +929,10 @@ static inline void set_pte_common(struct
pgprintk("%s: found shadow page for %lx, marking ro\n",
__FUNCTION__, gfn);
access_bits &= ~PT_WRITABLE_MASK;
- *shadow_pte &= ~PT_WRITABLE_MASK;
+ if (is_writeble_pte(*shadow_pte)) {
+ *shadow_pte &= ~PT_WRITABLE_MASK;
+ kvm_arch_ops->tlb_flush(vcpu);
+ }
}
}
_
Patches currently in -mm which might be from avi@xxxxxxxxxxxx are
-
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