Commit ae6f389b authored by James Hogan's avatar James Hogan Committed by Luis Henriques

MIPS: Fix KVM guest fixmap address

commit 8e748c8d 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.
Signed-off-by: default avatarJames Hogan <james.hogan@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9887/Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
Signed-off-by: default avatarLuis Henriques <luis.henriques@canonical.com>
parent a378f601
...@@ -94,7 +94,11 @@ ...@@ -94,7 +94,11 @@
#endif #endif
#ifndef FIXADDR_TOP #ifndef FIXADDR_TOP
#ifdef CONFIG_KVM_GUEST
#define FIXADDR_TOP ((unsigned long)(long)(int)0x7ffe0000)
#else
#define FIXADDR_TOP ((unsigned long)(long)(int)0xfffe0000) #define FIXADDR_TOP ((unsigned long)(long)(int)0xfffe0000)
#endif #endif
#endif
#endif /* __ASM_MACH_GENERIC_SPACES_H */ #endif /* __ASM_MACH_GENERIC_SPACES_H */
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