Patch "MIPS: Fix KVM guest fixmap address" has been added to the 4.1-stable tree

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

MIPS: Fix KVM guest fixmap address

to the 4.1-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-fix-kvm-guest-fixmap-address.patch
and it can be found in the queue-4.1 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: James Hogan <[email protected]>
Date: Mon, 27 Apr 2015 15:07:16 +0100
Subject: MIPS: Fix KVM guest fixmap address

From: James Hogan <[email protected]>

commit 8e748c8d09a9314eedb5c6367d9acfaacddcdc88 upstream.

KVM guest kernels for trap & emulate run in user mode, with a modified set of kernel memory segments. However the fixmap address is still in the normal KSeg3 region at 0xfffe0000 regardless, causing problems when cache alias handling makes use of them when handling copy on write.

Therefore define FIXADDR_TOP as 0x7ffe0000 in the guest kernel mapped region when CONFIG_KVM_GUEST is defined.

Patchwork: https://patchwork.linux-mips.org/patch/9887/

---
 arch/mips/include/asm/mach-generic/spaces.h |    4 ++++
 1 file changed, 4 insertions(+)

@@ -94,7 +94,11 @@
 #endif
 
 #ifndef FIXADDR_TOP
+#ifdef CONFIG_KVM_GUEST
+#define FIXADDR_TOP		((unsigned long)(long)(int)0x7ffe0000)
+#else
 #define FIXADDR_TOP		((unsigned long)(long)(int)0xfffe0000)
 #endif
+#endif
 
 #endif /* __ASM_MACH_GENERIC_SPACES_H */

Patches currently in stable-queue which might be from [email protected] are

queue-4.1/mips-fix-kvm-guest-fixmap-address.patch queue-4.1/kvm-mips-use-id_to_memslot-correctly.patch