arm64/boot: Disable trapping of PMZR_EL0 writes to EL2grafted

__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 <fuad.tabba@linux.dev>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Reviewed-by: Oliver Upton <oupton@kernel.org>
Signed-off-by: Will Deacon <will@kernel.org>

1 files changed, 25 insertions, 0 deletions

diff --git a/drivers/ipack/Kconfig b/drivers/ipack/Kconfig
new file mode 100644
index 000000000..fb30091de
--- /dev/null
+++ b/drivers/ipack/Kconfig
@@ -0,0 +1,25 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# IPACK configuration.
+#
+
+menuconfig IPACK_BUS
+	tristate "IndustryPack bus support"
+	depends on HAS_IOMEM
+	help
+	  This option provides support for the IndustryPack framework.  There
+	  are IndustryPack carrier boards, which interface another bus (such as
+	  PCI) to an IndustryPack bus, and IndustryPack modules, that are
+	  hosted on these buses.  While IndustryPack modules can provide a
+	  large variety of functionality, they are most often found in
+	  industrial control applications.
+
+	  Say N if unsure.
+
+if IPACK_BUS
+
+source "drivers/ipack/carriers/Kconfig"
+
+source "drivers/ipack/devices/Kconfig"
+
+endif # IPACK