diff options
| author | Sanjay Lal <sanjayl@kymasys.com> | 2012-11-22 03:34:03 +0100 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2013-05-08 03:55:35 +0200 |
| commit | 9843b030cc951bce4a4d9bec38b5155c96eb1740 (patch) | |
| tree | dd219e76dce1e1b92e6f5fc19e8767b60827c7ee /arch/mips/include/asm/uaccess.h | |
| parent | KVM/MIPS32: MIPS arch specific APIs for KVM (diff) | |
| download | linux-9843b030cc951bce4a4d9bec38b5155c96eb1740.tar.xz linux-9843b030cc951bce4a4d9bec38b5155c96eb1740.zip | |
KVM/MIPS32: KVM Guest kernel support.
Both Guest kernel and Guest Userspace execute in UM. The memory map is as follows:
Guest User address space: 0x00000000 -> 0x40000000
Guest Kernel Unmapped: 0x40000000 -> 0x60000000
Guest Kernel Mapped: 0x60000000 -> 0x80000000
- Guest Usermode virtual memory is limited to 1GB.
Signed-off-by: Sanjay Lal <sanjayl@kymasys.com>
Cc: kvm@vger.kernel.org
Cc: linux-mips@linux-mips.org
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/include/asm/uaccess.h')
| -rw-r--r-- | arch/mips/include/asm/uaccess.h | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/arch/mips/include/asm/uaccess.h b/arch/mips/include/asm/uaccess.h index bd87e36bf26a..b46caab453a5 100644 --- a/arch/mips/include/asm/uaccess.h +++ b/arch/mips/include/asm/uaccess.h @@ -23,7 +23,11 @@ */ #ifdef CONFIG_32BIT -#define __UA_LIMIT 0x80000000UL +#ifdef CONFIG_KVM_GUEST +#define __UA_LIMIT 0x40000000UL +#else +#define __UA_LIMIT 0x80000000UL +#endif #define __UA_ADDR ".word" #define __UA_LA "la" @@ -55,8 +59,13 @@ extern u64 __ua_limit; * address in this range it's the process's problem, not ours :-) */ +#ifdef CONFIG_KVM_GUEST +#define KERNEL_DS ((mm_segment_t) { 0x80000000UL }) +#define USER_DS ((mm_segment_t) { 0xC0000000UL }) +#else #define KERNEL_DS ((mm_segment_t) { 0UL }) #define USER_DS ((mm_segment_t) { __UA_LIMIT }) +#endif #define VERIFY_READ 0 #define VERIFY_WRITE 1 |