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perf/x86/intel/pt: Fix topa_entry base length

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commit 5638bd722a upstream.

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: 52ca9ced3f ("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
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Marco Cavenati
2024-06-24 23:10:55 +03:00
committed by Greg Kroah-Hartman
parent 549aac9655
commit b4030b6190
1 changed files with 2 additions and 2 deletions
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arch/x86/events/intel/pt.h
+2 -2
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@@ -78,8 +78,8 @@ struct topa_entry {
u64 rsvd2 : 1;
u64 size : 4;
u64 rsvd3 : 2;
u64 base : 36;
u64 rsvd4 : 16;
u64 base : 40;
u64 rsvd4 : 12;
};
#define PT_CPUID_LEAVES 2