FAILED: patch "[PATCH] MIPS: KVM: Fix gfn range check in kseg0 tlb faults" failed to apply to 3.14-stable tree

From: <gregkh@linuxfoundation.org>
Date: 2016-08-18 08:08:32
Subsystem: kernel virtual machine for mips (kvm/mips), mips, the rest · Maintainers: Huacai Chen, Thomas Bogendoerfer, Linus Torvalds

The patch below does not apply to the 3.14-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to [off-list ref].

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------
From 0741f52d1b980dbeb290afe67d88fc2928edd8ab Mon Sep 17 00:00:00 2001
From: James Hogan <redacted>
Date: Thu, 11 Aug 2016 11:58:14 +0100
Subject: [PATCH] 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

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 <redacted>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: "Radim Krčmář" <redacted>
Cc: Ralf Baechle <redacted>
Cc: linux-mips@linux-mips.org
Cc: kvm@vger.kernel.org
Cc: <redacted> # 3.10.x-
Signed-off-by: Radim Krčmář <redacted>
diff --git a/arch/mips/kvm/mmu.c b/arch/mips/kvm/mmu.c
index 701c1b64cef8..6a8a21859502 100644
--- a/arch/mips/kvm/mmu.c
+++ b/arch/mips/kvm/mmu.c
@@ -99,7 +99,7 @@ int kvm_mips_handle_kseg0_tlb_fault(unsigned long badvaddr,
 	}
 
 	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();
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