Patch "MIPS: KVM: Fix CACHE immediate offset sign extension" has been added to the 4.3-stable tree

Patch "MIPS: KVM: Fix CACHE immediate offset sign extension" has been added to the 4.3-stable tree

[gregkh]

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

    MIPS: KVM: Fix CACHE immediate offset sign extension

to the 4.3-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-cache-immediate-offset-sign-extension.patch
and it can be found in the queue-4.3 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 c5c2a3b998f1ff5a586f9d37e154070b8d550d17 Mon Sep 17 00:00:00 2001
From: James Hogan <james.hogan@imgtec.com>
Date: Wed, 11 Nov 2015 14:21:19 +0000
Subject: MIPS: KVM: Fix CACHE immediate offset sign extension

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

commit c5c2a3b998f1ff5a586f9d37e154070b8d550d17 upstream.

The immediate field of the CACHE instruction is signed, so ensure that
it gets sign extended by casting it to an int16_t rather than just
masking the low 16 bits.

Fixes: e685c689f3a8 ("KVM/MIPS32: Privileged instruction/target branch emulation.")
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Gleb Natapov <gleb@kernel.org>
Cc: linux-mips@linux-mips.org
Cc: kvm@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/mips/kvm/emulate.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/mips/kvm/emulate.c
+++ b/arch/mips/kvm/emulate.c
@@ -1581,7 +1581,7 @@ enum emulation_result kvm_mips_emulate_c
 
 	base = (inst >> 21) & 0x1f;
 	op_inst = (inst >> 16) & 0x1f;
-	offset = inst & 0xffff;
+	offset = (int16_t)inst;
 	cache = (inst >> 16) & 0x3;
 	op = (inst >> 18) & 0x7;
 


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

queue-4.3/mips-kvm-fix-cache-immediate-offset-sign-extension.patch
queue-4.3/mips-kvm-fix-asid-restoration-logic.patch
queue-4.3/mips-cdmm-add-builtin_mips_cdmm_driver-macro.patch
queue-4.3/mips-kvm-uninit-vcpu-in-vcpu_create-error-path.patch