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| author | Mohan Kumar M <mohan@in.ibm.com> | 2007-03-21 11:21:32 +0530 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2007-03-22 15:01:43 +1100 |
| commit | b4aea36b7956eeebfc56314ce0944db1441255ce (patch) | |
| tree | a0c84f25e1f5a2ef0af624871e8f892654fd79a4 /arch/powerpc/platforms/pseries/plpar_wrappers.h | |
| parent | f144e7c7272bf527c380bffaa5e789dc28a09d8d (diff) | |
| download | lwn-b4aea36b7956eeebfc56314ce0944db1441255ce.tar.gz lwn-b4aea36b7956eeebfc56314ce0944db1441255ce.zip | |
[POWERPC] Avoid hypervisor statistics calculation in real mode
kexec invokes plpar_hcall hypervisor call in real mode. plpar_hcall
refers to per cpu variables for accounting hypervisor statistics.
These variables may not be in the RMO region, so accesses to them
in real mode may result in a data storage exception.
This fixes this problem by using a new plpar_hcall_raw function which
does not update the hypervisor call statistics. Thanks to Anton for
suggesting this idea.
Signed-off-by: Mohan Kumar M <mohan@in.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/platforms/pseries/plpar_wrappers.h')
| -rw-r--r-- | arch/powerpc/platforms/pseries/plpar_wrappers.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/pseries/plpar_wrappers.h b/arch/powerpc/platforms/pseries/plpar_wrappers.h index 3eb7b294d92f..2e4d10c9eea8 100644 --- a/arch/powerpc/platforms/pseries/plpar_wrappers.h +++ b/arch/powerpc/platforms/pseries/plpar_wrappers.h @@ -78,6 +78,22 @@ static inline long plpar_pte_remove(unsigned long flags, unsigned long ptex, return rc; } +/* plpar_pte_remove_raw can be called in real mode. It calls plpar_hcall_raw */ +static inline long plpar_pte_remove_raw(unsigned long flags, unsigned long ptex, + unsigned long avpn, unsigned long *old_pteh_ret, + unsigned long *old_ptel_ret) +{ + long rc; + unsigned long retbuf[PLPAR_HCALL_BUFSIZE]; + + rc = plpar_hcall_raw(H_REMOVE, retbuf, flags, ptex, avpn); + + *old_pteh_ret = retbuf[0]; + *old_ptel_ret = retbuf[1]; + + return rc; +} + static inline long plpar_pte_read(unsigned long flags, unsigned long ptex, unsigned long *old_pteh_ret, unsigned long *old_ptel_ret) { |