The following commit has been merged into the perf/core branch of tip:
Commit-ID: 5638bd722a44bbe97c1a7b3fae5b9efddb3e70ff Gitweb: https://git.kernel.org/tip/5638bd722a44bbe97c1a7b3fae5b9efddb3e70ff Author: Marco Cavenati cavenati.marco@gmail.com AuthorDate: Mon, 24 Jun 2024 23:10:55 +03:00 Committer: Peter Zijlstra peterz@infradead.org CommitterDate: Thu, 04 Jul 2024 16:00:20 +02:00
perf/x86/intel/pt: Fix topa_entry base length
topa_entry->base needs to store a pfn. It obviously needs to be large enough to store the largest possible x86 pfn which is MAXPHYADDR-PAGE_SIZE (52-12). So it is 4 bits too small.
Increase the size of topa_entry->base from 36 bits to 40 bits.
Note, systems where physical addresses can be 256TiB or more are affected.
[ Adrian: Amend commit message as suggested by Dave Hansen ]
Fixes: 52ca9ced3f70 ("perf/x86/intel/pt: Add Intel PT PMU driver") Signed-off-by: Marco Cavenati cavenati.marco@gmail.com Signed-off-by: Adrian Hunter adrian.hunter@intel.com Signed-off-by: Peter Zijlstra (Intel) peterz@infradead.org Reviewed-by: Adrian Hunter adrian.hunter@intel.com Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20240624201101.60186-2-adrian.hunter@intel.com --- arch/x86/events/intel/pt.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/x86/events/intel/pt.h b/arch/x86/events/intel/pt.h index 96906a6..f5e46c0 100644 --- a/arch/x86/events/intel/pt.h +++ b/arch/x86/events/intel/pt.h @@ -33,8 +33,8 @@ struct topa_entry { u64 rsvd2 : 1; u64 size : 4; u64 rsvd3 : 2; - u64 base : 36; - u64 rsvd4 : 16; + u64 base : 40; + u64 rsvd4 : 12; };
/* TSC to Core Crystal Clock Ratio */