This is a note to let you know that I've just added the patch titled
KVM: x86: handle SMBASE as physical address in RSM
to the 4.2-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:
kvm-x86-handle-smbase-as-physical-address-in-rsm.patch
and it can be found in the queue-4.2 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From f40606b147dd5b4678cedc877a71deb520ca507e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= <rkrcmar@xxxxxxxxxx>
Date: Fri, 30 Oct 2015 16:36:25 +0100
Subject: KVM: x86: handle SMBASE as physical address in RSM
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From: =?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= <rkrcmar@xxxxxxxxxx>
commit f40606b147dd5b4678cedc877a71deb520ca507e upstream.
GET_SMSTATE depends on real mode to ensure that smbase+offset is treated
as a physical address, which has already caused a bug after shuffling
the code. Enforce physical addressing.
Signed-off-by: Radim Krčmář <rkrcmar@xxxxxxxxxx>
Reported-by: Laszlo Ersek <lersek@xxxxxxxxxx>
Tested-by: Laszlo Ersek <lersek@xxxxxxxxxx>
Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/x86/kvm/emulate.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -2272,8 +2272,8 @@ static int emulator_has_longmode(struct
#define GET_SMSTATE(type, smbase, offset) \
({ \
type __val; \
- int r = ctxt->ops->read_std(ctxt, smbase + offset, &__val, \
- sizeof(__val), NULL); \
+ int r = ctxt->ops->read_phys(ctxt, smbase + offset, &__val, \
+ sizeof(__val)); \
if (r != X86EMUL_CONTINUE) \
return X86EMUL_UNHANDLEABLE; \
__val; \
@@ -2484,8 +2484,7 @@ static int em_rsm(struct x86_emulate_ctx
/*
* Get back to real mode, to prepare a safe state in which to load
- * CR0/CR3/CR4/EFER. Also this will ensure that addresses passed
- * to read_std/write_std are not virtual.
+ * CR0/CR3/CR4/EFER.
*
* CR4.PCIDE must be zero, because it is a 64-bit mode only feature.
*/
Patches currently in stable-queue which might be from rkrcmar@xxxxxxxxxx are
queue-4.2/kvm-x86-set-kvm_req_event-when-updating-irr.patch
queue-4.2/kvm-x86-handle-smbase-as-physical-address-in-rsm.patch
queue-4.2/kvm-x86-allow-rsm-from-64-bit-mode.patch
queue-4.2/kvm-x86-add-read_phys-to-x86_emulate_ops.patch
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