The patch below does not apply to the 4.19-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-4.19.y git checkout FETCH_HEAD git cherry-pick -x ad97196379d0b8cb24ef3d5006978a6554e6467f # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2024073023-blame-activist-10a9@gregkh' --subject-prefix 'PATCH 4.19.y' HEAD^..

Possible dependencies:

ad97196379d0 ("perf/x86/intel/pt: Fix a topa_entry base address calculation") 38bb8d77d0b9 ("perf/x86/intel/pt: Split ToPA metadata and page layout") 539f7c26b41d ("perf/x86/intel/pt: Use pointer arithmetics instead in ToPA entry calculation") fffec50f541a ("perf/x86/intel/pt: Use helpers to obtain ToPA entry size") f6d079ce867d ("perf/x86/intel/pt: Export pt_cap_get()")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From ad97196379d0b8cb24ef3d5006978a6554e6467f Mon Sep 17 00:00:00 2001 From: Adrian Hunter adrian.hunter@intel.com Date: Mon, 24 Jun 2024 23:10:56 +0300 Subject: [PATCH] perf/x86/intel/pt: Fix a topa_entry base address calculation

topa_entry->base is a bit-field. Bit-fields are not promoted to a 64-bit type, even if the underlying type is 64-bit, and so, if necessary, must be cast to a larger type when calculations are done.

Fix a topa_entry->base address calculation by adding a cast.

Without the cast, the address was limited to 36-bits i.e. 64GiB.

The address calculation is used on systems that do not support Multiple Entry ToPA (only Broadwell), and affects physical addresses on or above 64GiB. Instead of writing to the correct address, the address comprising the first 36 bits would be written to.

Intel PT snapshot and sampling modes are not affected.

Fixes: 52ca9ced3f70 ("perf/x86/intel/pt: Add Intel PT PMU driver") Reported-by: Dave Hansen dave.hansen@linux.intel.com Signed-off-by: Adrian Hunter adrian.hunter@intel.com Signed-off-by: Peter Zijlstra (Intel) peterz@infradead.org Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20240624201101.60186-3-adrian.hunter@intel.com

diff --git a/arch/x86/events/intel/pt.c b/arch/x86/events/intel/pt.c index 14db6d9d318b..047a2cd5b3fe 100644 --- a/arch/x86/events/intel/pt.c +++ b/arch/x86/events/intel/pt.c @@ -878,7 +878,7 @@ static void pt_update_head(struct pt *pt) */ static void *pt_buffer_region(struct pt_buffer *buf) { - return phys_to_virt(TOPA_ENTRY(buf->cur, buf->cur_idx)->base << TOPA_SHIFT); + return phys_to_virt((phys_addr_t)TOPA_ENTRY(buf->cur, buf->cur_idx)->base << TOPA_SHIFT); }

/**