Patch "MIPS: KVM: Fix gfn range check in kseg0 tlb faults" has been added to the 4.7-stable tree

Patch "MIPS: KVM: Fix gfn range check in kseg0 tlb faults" has been added to the 4.7-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    MIPS: KVM: Fix gfn range check in kseg0 tlb faults

to the 4.7-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     mips-kvm-fix-gfn-range-check-in-kseg0-tlb-faults.patch
and it can be found in the queue-4.7 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 0741f52d1b980dbeb290afe67d88fc2928edd8ab Mon Sep 17 00:00:00 2001
From: James Hogan <james.hogan@imgtec.com>
Date: Thu, 11 Aug 2016 11:58:14 +0100
Subject: MIPS: KVM: Fix gfn range check in kseg0 tlb faults
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

From: James Hogan <james.hogan@imgtec.com>

commit 0741f52d1b980dbeb290afe67d88fc2928edd8ab upstream.

Two consecutive gfns are loaded into host TLB, so ensure the range check
isn't off by one if guest_pmap_npages is odd.

Fixes: 858dd5d45733 ("KVM/MIPS32: MMU/TLB operations for the Guest.")
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: "Radim Krčmář" <rkrcmar@redhat.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Cc: kvm@vger.kernel.org
Cc: <stable@vger.kernel.org> # 3.10.x-
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
[james.hogan@imgtec.com: Backport to v4.7]
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 arch/mips/kvm/tlb.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/mips/kvm/tlb.c
+++ b/arch/mips/kvm/tlb.c
@@ -284,7 +284,7 @@ int kvm_mips_handle_kseg0_tlb_fault(unsi
 	}
 
 	gfn = (KVM_GUEST_CPHYSADDR(badvaddr) >> PAGE_SHIFT);
-	if (gfn >= kvm->arch.guest_pmap_npages) {
+	if ((gfn | 1) >= kvm->arch.guest_pmap_npages) {
 		kvm_err("%s: Invalid gfn: %#llx, BadVaddr: %#lx\n", __func__,
 			gfn, badvaddr);
 		kvm_mips_dump_host_tlbs();


Patches currently in stable-queue which might be from james.hogan@imgtec.com are

queue-4.7/mips-kvm-add-missing-gfn-range-check.patch
queue-4.7/mips-kvm-propagate-kseg0-mapped-tlb-fault-errors.patch
queue-4.7/mips-kvm-fix-mapped-fault-broken-commpage-handling.patch
queue-4.7/mips-kvm-fix-gfn-range-check-in-kseg0-tlb-faults.patch