leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity

powerpc: Update TM user feature bits in scan_features()

Browse Source 
We need to update the user TM feature bits (PPC_FEATURE2_HTM and
PPC_FEATURE2_HTM) to mirror what we do with the kernel TM feature
bit.

At the moment, if firmware reports TM is not available we turn off
the kernel TM feature bit but leave the userspace ones on. Userspace
thinks it can execute TM instructions and it dies trying.

This (together with a QEMU patch) fixes PR KVM, which doesn't currently
support TM.

Signed-off-by: Anton Blanchard <anton@samba.org>
Cc: stable@vger.kernel.org
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Anton Blanchard 2016-04-15 12:08:19 +10:00 committed by Michael Ellerman
parent beff82374b
commit 4705e02498
1 changed files with 5 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
arch/powerpc/kernel/prom.c
View File

@ -161,11 +161,12 @@ static struct ibm_pa_feature {
{0, MMU_FTR_CI_LARGE_PAGE, 0, 0, 1, 2, 0},
{CPU_FTR_REAL_LE, 0, PPC_FEATURE_TRUE_LE, 0, 5, 0, 0},
/*
* If the kernel doesn't support TM (ie. CONFIG_PPC_TRANSACTIONAL_MEM=n),
* we don't want to turn on CPU_FTR_TM here, so we use CPU_FTR_TM_COMP
* which is 0 if the kernel doesn't support TM.
* If the kernel doesn't support TM (ie CONFIG_PPC_TRANSACTIONAL_MEM=n),
* we don't want to turn on TM here, so we use the *_COMP versions
* which are 0 if the kernel doesn't support TM.
*/
{CPU_FTR_TM_COMP, 0, 0, 0, 22, 0, 0},
{CPU_FTR_TM_COMP, 0, 0,
PPC_FEATURE2_HTM_COMP|PPC_FEATURE2_HTM_NOSC_COMP, 22, 0, 0},
};
static void __init scan_features(unsigned long node, const unsigned char *ftrs,