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, 32 insertions, 0 deletions

diff --git a/include/crypto/streebog.h b/include/crypto/streebog.h
new file mode 100644
index 000000000..570f720a1
--- /dev/null
+++ b/include/crypto/streebog.h
@@ -0,0 +1,32 @@
+/* SPDX-License-Identifier: GPL-2.0+ OR BSD-2-Clause */
+/*
+ * Copyright (c) 2013 Alexey Degtyarev <alexey@renatasystems.org>
+ * Copyright (c) 2018 Vitaly Chikunov <vt@altlinux.org>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ */
+
+#ifndef _CRYPTO_STREEBOG_H_
+#define _CRYPTO_STREEBOG_H_
+
+#include <linux/types.h>
+
+#define STREEBOG256_DIGEST_SIZE	32
+#define STREEBOG512_DIGEST_SIZE	64
+#define STREEBOG_BLOCK_SIZE	64
+
+struct streebog_uint512 {
+	__le64 qword[8];
+};
+
+struct streebog_state {
+	struct streebog_uint512 hash;
+	struct streebog_uint512 h;
+	struct streebog_uint512 N;
+	struct streebog_uint512 Sigma;
+};
+
+#endif /* !_CRYPTO_STREEBOG_H_ */