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| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2018-04-27 08:36:52 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-04-29 08:50:03 +0300 |
| commit | 2d863392f86b01ae0a578f72062ef8c5a27d651c (patch) | |
| tree | cacbf0be4a525c0635570f513f30e438958ca70b /arch/s390/include/asm | |
| parent | 76c45c1be03c60f9d983aed017182760dbd8bbf9 (diff) | |
| download | linux-2d863392f86b01ae0a578f72062ef8c5a27d651c.tar.xz | |
s390: run user space and KVM guests with modified branch prediction
[ Upstream commit 6b73044b2b0081ee3dd1cd6eaab7dee552601efb ]
Define TIF_ISOLATE_BP and TIF_ISOLATE_BP_GUEST and add the necessary
plumbing in entry.S to be able to run user space and KVM guests with
limited branch prediction.
To switch a user space process to limited branch prediction the
s390_isolate_bp() function has to be call, and to run a vCPU of a KVM
guest associated with the current task with limited branch prediction
call s390_isolate_bp_guest().
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/s390/include/asm')
| -rw-r--r-- | arch/s390/include/asm/processor.h | 3 | ||||
| -rw-r--r-- | arch/s390/include/asm/thread_info.h | 4 |
2 files changed, 7 insertions, 0 deletions
diff --git a/arch/s390/include/asm/processor.h b/arch/s390/include/asm/processor.h index d5431b366e1a..f915a0f1b0fc 100644 --- a/arch/s390/include/asm/processor.h +++ b/arch/s390/include/asm/processor.h @@ -316,6 +316,9 @@ extern void memcpy_absolute(void *, void *, size_t); memcpy_absolute(&(dest), &__tmp, sizeof(__tmp)); \ } +extern int s390_isolate_bp(void); +extern int s390_isolate_bp_guest(void); + #endif /* __ASSEMBLY__ */ #endif /* __ASM_S390_PROCESSOR_H */ diff --git a/arch/s390/include/asm/thread_info.h b/arch/s390/include/asm/thread_info.h index 692b9247c019..b2504163c8fa 100644 --- a/arch/s390/include/asm/thread_info.h +++ b/arch/s390/include/asm/thread_info.h @@ -78,6 +78,8 @@ void arch_release_task_struct(struct task_struct *tsk); #define TIF_SECCOMP 5 /* secure computing */ #define TIF_SYSCALL_TRACEPOINT 6 /* syscall tracepoint instrumentation */ #define TIF_UPROBE 7 /* breakpointed or single-stepping */ +#define TIF_ISOLATE_BP 8 /* Run process with isolated BP */ +#define TIF_ISOLATE_BP_GUEST 9 /* Run KVM guests with isolated BP */ #define TIF_31BIT 16 /* 32bit process */ #define TIF_MEMDIE 17 /* is terminating due to OOM killer */ #define TIF_RESTORE_SIGMASK 18 /* restore signal mask in do_signal() */ @@ -93,6 +95,8 @@ void arch_release_task_struct(struct task_struct *tsk); #define _TIF_SECCOMP _BITUL(TIF_SECCOMP) #define _TIF_SYSCALL_TRACEPOINT _BITUL(TIF_SYSCALL_TRACEPOINT) #define _TIF_UPROBE _BITUL(TIF_UPROBE) +#define _TIF_ISOLATE_BP _BITUL(TIF_ISOLATE_BP) +#define _TIF_ISOLATE_BP_GUEST _BITUL(TIF_ISOLATE_BP_GUEST) #define _TIF_31BIT _BITUL(TIF_31BIT) #define _TIF_SINGLE_STEP _BITUL(TIF_SINGLE_STEP) |