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, 38 insertions, 0 deletions

diff --git a/include/video/maxinefb.h b/include/video/maxinefb.h
new file mode 100644
index 000000000..2b66b32f3
--- /dev/null
+++ b/include/video/maxinefb.h
@@ -0,0 +1,38 @@
+/*
+ *      linux/drivers/video/maxinefb.h
+ *
+ *      DECstation 5000/xx onboard framebuffer support, Copyright (C) 1999 by
+ *      Michael Engel <engel@unix-ag.org> and Karsten Merker <merker@guug.de>
+ *      This file is subject to the terms and conditions of the GNU General
+ *      Public License.  See the file COPYING in the main directory of this
+ *      archive for more details.
+ */
+
+#include <asm/addrspace.h>
+
+/*
+ * IMS332 video controller register base address
+ */
+#define MAXINEFB_IMS332_ADDRESS		CKSEG1ADDR(0x1c140000)
+
+/*
+ * Begin of DECstation 5000/xx onboard framebuffer memory, default resolution
+ * is 1024x768x8
+ */
+#define DS5000_xx_ONBOARD_FBMEM_START	CKSEG1ADDR(0x0a000000)
+
+/*
+ *      The IMS 332 video controller used in the DECstation 5000/xx series
+ *      uses 32 bits wide registers; the following defines declare the
+ *      register numbers, to get the real offset, these have to be multiplied
+ *      by four.
+ */
+
+#define IMS332_REG_CURSOR_RAM           0x200	/* hardware cursor bitmap */
+
+/*
+ * The color palette entries have the form 0x00BBGGRR
+ */
+#define IMS332_REG_COLOR_PALETTE        0x100	/* color palette, 256 entries */
+#define IMS332_REG_CURSOR_COLOR_PALETTE	0x0a1	/* cursor color palette, */
+						/* 3 entries             */