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POWER: Add context-synchronizing instructions to pkey_write [BZ #25954]

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Sandipan Das reported that,

"The Power ISA mandates that all writes to the Authority
Mask Register (AMR) must always be preceded as well as
succeeded by a context-synchronizing instruction. This
applies to both the privileged and unprivileged variants
of the Move To AMR instruction.

This [requirement] is from Table 6 of Chapter 11 in page 1134 of Power
ISA 3.0B. The document can be found here:
<https://ibm.ent.box.com/s/1hzcwkwf8rbju5h9iyf44wm94amnlcrv>
"

See this kernel patch submission:

<https://lore.kernel.org/linuxppc-dev/5f65cf37be993760de8112a88da194e3ccbb2bf8.1588959697.git.sandipan@linux.ibm.com/>
This commit is contained in:
Florian Weimer 2020-05-11 11:20:02 +02:00
parent 61416e1921
commit e627106266
1 changed files with 1 additions and 1 deletions
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2
sysdeps/unix/sysv/linux/powerpc/powerpc64/arch-pkey.h
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@ -37,7 +37,7 @@ pkey_read (void)
static inline void
pkey_write (unsigned long int value)
{
__asm__ volatile ("mtspr 13, %0" : : "r" (value));
__asm__ volatile ("isync; mtspr 13, %0; isync" : : "r" (value));
}
/* Number of the largest supported key. This depends on the width of