From 2bc6b218717b9d08f466f88209251d54bc09b207 Mon Sep 17 00:00:00 2001 From: Fuad Tabba Date: Tue, 22 Sep 2026 19:14:30 +0100 Subject: arm64/boot: Disable trapping of PMZR_EL0 writes to EL2 __init_el2_fgt2() writes one mask to both HDFGRTR2_EL2 and HDFGWTR2_EL2. PMZR_EL0 is write-only, so its trap bit, nPMZR_EL0, exists only in HDFGWTR2_EL2 and is therefore never set: a PMZR_EL0 write from the host traps to EL2, where the nVHE hypervisor has no handler and BUG()s. The kernel never writes PMZR_EL0, but kernel.perf_user_access=1 has the PMU driver set PMUSERENR_EL0.UEN for a task with a user-read event, so a write from EL0 reaches the trap and takes the host down without a panic message. Accumulate the HDFGWTR2_EL2 bits separately, as __init_el2_fgt() already does for HDFGWTR_EL2, and set nPMZR_EL0 with the other FEAT_PMUv3p9 bits. Fixes: 858c7bfcb35e1 ("arm64/boot: Enable EL2 requirements for FEAT_PMUv3p9") Cc: stable@vger.kernel.org Signed-off-by: Fuad Tabba Reviewed-by: Anshuman Khandual Reviewed-by: Oliver Upton Signed-off-by: Will Deacon --- Documentation/dev-tools/index.rst | 42 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+) create mode 100644 Documentation/dev-tools/index.rst (limited to 'Documentation/dev-tools/index.rst') diff --git a/Documentation/dev-tools/index.rst b/Documentation/dev-tools/index.rst new file mode 100644 index 000000000..59cbb77b3 --- /dev/null +++ b/Documentation/dev-tools/index.rst @@ -0,0 +1,42 @@ +================================ +Development tools for the kernel +================================ + +This document is a collection of documents about development tools that can +be used to work on the kernel. For now, the documents have been pulled +together without any significant effort to integrate them into a coherent +whole; patches welcome! + +A brief overview of testing-specific tools can be found in +Documentation/dev-tools/testing-overview.rst + +Tools that are specific to debugging can be found in +Documentation/process/debugging/index.rst + +.. toctree:: + :caption: Table of contents + :maxdepth: 2 + + testing-overview + checkpatch + clang-format + coccinelle + context-analysis + sparse + kcov + gcov + kasan + kmsan + ubsan + kmemleak + kcsan + lkmm/index + kfence + kselftest + kunit/index + ktap + checkuapi + gpio-sloppy-logic-analyzer + autofdo + propeller + container -- cgit v1.3.1