diff options
| author | Christian Borntraeger <borntraeger@de.ibm.com> | 2015-10-06 19:06:15 +0300 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2015-10-14 15:32:12 +0300 |
| commit | e22cf8ca6f75a6c4fccf2d6ee818bdb1205f32e6 (patch) | |
| tree | 12ed8edf751776df56b758ba1347b991dbe2afb7 /arch/s390/mm | |
| parent | 6a62b485eacaf4db26923bf9442073320fc7199a (diff) | |
| download | linux-e22cf8ca6f75a6c4fccf2d6ee818bdb1205f32e6.tar.xz | |
s390/cpumf: rework program parameter setting to detect guest samples
The program parameter can be used to mark hardware samples with
some token. Previously, it was used to mark guest samples only.
Improve the program parameter doubleword by combining two parts,
the leftmost LPP part and the rightmost PID part. Set the PID
part for processes by using the task PID.
To distinguish host and guest samples for the kernel (PID part
is zero), the guest must always set the program paramater to a
non-zero value. Use the leftmost bit in the LPP part of the
program parameter to be able to detect guest kernel samples.
[brueckner@linux.vnet.ibm.com]: Split __LC_CURRENT and introduced
__LC_LPP. Corrected __LC_CURRENT users and adjusted assembler parts.
And updated the commit message accordingly.
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/mm')
| -rw-r--r-- | arch/s390/mm/fault.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c index 77b3938d6bfa..ec1a30d0d11a 100644 --- a/arch/s390/mm/fault.c +++ b/arch/s390/mm/fault.c @@ -590,7 +590,7 @@ int pfault_init(void) .reffcode = 0, .refdwlen = 5, .refversn = 2, - .refgaddr = __LC_CURRENT_PID, + .refgaddr = __LC_LPP, .refselmk = 1ULL << 48, .refcmpmk = 1ULL << 48, .reserved = __PF_RES_FIELD }; @@ -649,7 +649,7 @@ static void pfault_interrupt(struct ext_code ext_code, return; inc_irq_stat(IRQEXT_PFL); /* Get the token (= pid of the affected task). */ - pid = param64; + pid = param64 & LPP_PFAULT_PID_MASK; rcu_read_lock(); tsk = find_task_by_pid_ns(pid, &init_pid_ns); if (tsk) |