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 <[EMAIL PROTECTED]>
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 <[EMAIL PROTECTED]>
Acked-by: Ingo Molnar <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
---
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 [EMAIL PROTECTED] are
-
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