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authorMichael Ellerman <mpe@ellerman.id.au>2017-07-17 21:19:01 +1000
committerMichael Ellerman <mpe@ellerman.id.au>2017-07-17 21:30:32 +1000
commita70b487b07cf4201bc6702e7f646fa593b23009f (patch)
treec6a8ab47fb925a86a2f8f2ee5a14c8bce802c137 /arch/powerpc
parent01e6a61aceb82e13bec29502a8eb70d9574f97ad (diff)
downloadblackbird-op-linux-a70b487b07cf4201bc6702e7f646fa593b23009f.tar.gz
blackbird-op-linux-a70b487b07cf4201bc6702e7f646fa593b23009f.zip
powerpc/powernv: Fix boot on Power8 bare metal due to opal_configure_cores()
In commit 1c0eaf0f56d6 ("powerpc/powernv: Tell OPAL about our MMU mode on POWER9"), we added additional flags to the OPAL call to configure CPUs at boot. These flags only work on Power9 firmwares, and worse can cause boot failures on Power8 machines, so we check for CPU_FTR_ARCH_300 (aka POWER9) before adding the extra flags. Unfortunately we forgot that opal_configure_cores() is called before the CPU feature checks are dynamically patched, meaning the check always returns true. We definitely need to do something to make the CPU feature checks less prone to bugs like this, but for now the minimal fix is to use early_cpu_has_feature(). Reported-and-tested-by: Abdul Haleem <abdhalee@linux.vnet.ibm.com> Fixes: 1c0eaf0f56d6 ("powerpc/powernv: Tell OPAL about our MMU mode on POWER9") Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc')
-rw-r--r--arch/powerpc/platforms/powernv/opal.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/powerpc/platforms/powernv/opal.c b/arch/powerpc/platforms/powernv/opal.c
index 9b87abb178f0..cad6b57ce494 100644
--- a/arch/powerpc/platforms/powernv/opal.c
+++ b/arch/powerpc/platforms/powernv/opal.c
@@ -78,7 +78,7 @@ void opal_configure_cores(void)
* ie. Host hash supports hash guests
* Host radix supports hash/radix guests
*/
- if (cpu_has_feature(CPU_FTR_ARCH_300)) {
+ if (early_cpu_has_feature(CPU_FTR_ARCH_300)) {
reinit_flags |= OPAL_REINIT_CPUS_MMU_HASH;
if (early_radix_enabled())
reinit_flags |= OPAL_REINIT_CPUS_MMU_RADIX;
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