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powerpc/tm: Save and restore AMR on treclaim and trechkpt

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Althought AMR is stashed in the checkpoint area, currently we don't save
it to the per thread checkpoint struct after a treclaim and so we don't
restore it either from that struct when we trechkpt. As a consequence when
the transaction is later rolled back the kernel space AMR value when the
trechkpt was done appears in userspace.

That commit saves and restores AMR accordingly on treclaim and trechkpt.
Since AMR value is also used in kernel space in other functions, it also
takes care of stashing kernel live AMR into the stack before treclaim and
before trechkpt, restoring it later, just before returning from tm_reclaim
and __tm_recheckpoint.

Is also fixes two nonrelated comments about CR and MSR.

Signed-off-by: Gustavo Romero <gromero@linux.ibm.com>
Tested-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200919150025.9609-1-gromero@linux.ibm.com
This commit is contained in:
Gustavo Romero 2020-09-19 12:00:25 -03:00 • committed by Michael Ellerman
parent 35d64734b6
commit d0ffdee8ff
3 changed files with 33 additions and 4 deletions
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1
arch/powerpc/include/asm/processor.h
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@ -220,6 +220,7 @@ struct thread_struct {
unsigned long tm_tar;
unsigned long tm_ppr;
unsigned long tm_dscr;
unsigned long tm_amr;
/*
* Checkpointed FP and VSX 0-31 register set.