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| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2017-10-05 09:44:26 +0300 |
|---|---|---|
| committer | Heiko Carstens <heiko.carstens@de.ibm.com> | 2017-11-14 13:01:43 +0300 |
| commit | c771320e9357c9b85634002daedfe5c8988f27a6 (patch) | |
| tree | bf405eb39a9cb33d352fddaf2edf3eeacf4eb74f /arch/s390/include/asm/ptrace.h | |
| parent | cefbeb5df56e1daf0adda8ca5eecee03c5084af6 (diff) | |
| download | linux-c771320e9357c9b85634002daedfe5c8988f27a6.tar.xz | |
s390/mm,kvm: improve detection of KVM guest faults
The identification of guest fault currently relies on the PF_VCPU flag.
This is set in guest_entry_irqoff and cleared in guest_exit_irqoff.
Both functions are called by __vcpu_run, the PF_VCPU flag is set for
quite a lot of kernel code outside of the guest execution.
Replace the PF_VCPU scheme with the PIF_GUEST_FAULT in the pt_regs and
make the program check handler code in entry.S set the bit only for
exception that occurred between the .Lsie_gmap and .Lsie_done labels.
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Diffstat (limited to 'arch/s390/include/asm/ptrace.h')
| -rw-r--r-- | arch/s390/include/asm/ptrace.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/s390/include/asm/ptrace.h b/arch/s390/include/asm/ptrace.h index 2f84e77f1f1b..a3788dafc0e1 100644 --- a/arch/s390/include/asm/ptrace.h +++ b/arch/s390/include/asm/ptrace.h @@ -13,10 +13,12 @@ #define PIF_SYSCALL 0 /* inside a system call */ #define PIF_PER_TRAP 1 /* deliver sigtrap on return to user */ #define PIF_SYSCALL_RESTART 2 /* restart the current system call */ +#define PIF_GUEST_FAULT 3 /* indicates program check in sie64a */ #define _PIF_SYSCALL _BITUL(PIF_SYSCALL) #define _PIF_PER_TRAP _BITUL(PIF_PER_TRAP) #define _PIF_SYSCALL_RESTART _BITUL(PIF_SYSCALL_RESTART) +#define _PIF_GUEST_FAULT _BITUL(PIF_GUEST_FAULT) #ifndef __ASSEMBLY__ |