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, 116 insertions, 0 deletions

diff --git a/include/math-emu/single.h b/include/math-emu/single.h
new file mode 100644
index 000000000..87f90b0f9
--- /dev/null
+++ b/include/math-emu/single.h
@@ -0,0 +1,116 @@
+/* Software floating-point emulation.
+   Definitions for IEEE Single Precision.
+   Copyright (C) 1997,1998,1999 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Richard Henderson (rth@cygnus.com),
+		  Jakub Jelinek (jj@ultra.linux.cz),
+		  David S. Miller (davem@redhat.com) and
+		  Peter Maydell (pmaydell@chiark.greenend.org.uk).
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 of the
+   License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If
+   not, write to the Free Software Foundation, Inc.,
+   59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+#ifndef    __MATH_EMU_SINGLE_H__
+#define    __MATH_EMU_SINGLE_H__
+
+#if _FP_W_TYPE_SIZE < 32
+#error "Here's a nickel kid.  Go buy yourself a real computer."
+#endif
+
+#define _FP_FRACBITS_S		24
+#define _FP_FRACXBITS_S		(_FP_W_TYPE_SIZE - _FP_FRACBITS_S)
+#define _FP_WFRACBITS_S		(_FP_WORKBITS + _FP_FRACBITS_S)
+#define _FP_WFRACXBITS_S	(_FP_W_TYPE_SIZE - _FP_WFRACBITS_S)
+#define _FP_EXPBITS_S		8
+#define _FP_EXPBIAS_S		127
+#define _FP_EXPMAX_S		255
+#define _FP_QNANBIT_S		((_FP_W_TYPE)1 << (_FP_FRACBITS_S-2))
+#define _FP_IMPLBIT_S		((_FP_W_TYPE)1 << (_FP_FRACBITS_S-1))
+#define _FP_OVERFLOW_S		((_FP_W_TYPE)1 << (_FP_WFRACBITS_S))
+
+/* The implementation of _FP_MUL_MEAT_S and _FP_DIV_MEAT_S should be
+   chosen by the target machine.  */
+
+union _FP_UNION_S
+{
+  float flt;
+  struct {
+#if __BYTE_ORDER == __BIG_ENDIAN
+    unsigned sign : 1;
+    unsigned exp  : _FP_EXPBITS_S;
+    unsigned frac : _FP_FRACBITS_S - (_FP_IMPLBIT_S != 0);
+#else
+    unsigned frac : _FP_FRACBITS_S - (_FP_IMPLBIT_S != 0);
+    unsigned exp  : _FP_EXPBITS_S;
+    unsigned sign : 1;
+#endif
+  } bits __attribute__((packed));
+};
+
+#define FP_DECL_S(X)		_FP_DECL(1,X)
+#define FP_UNPACK_RAW_S(X,val)	_FP_UNPACK_RAW_1(S,X,val)
+#define FP_UNPACK_RAW_SP(X,val)	_FP_UNPACK_RAW_1_P(S,X,val)
+#define FP_PACK_RAW_S(val,X)	_FP_PACK_RAW_1(S,val,X)
+#define FP_PACK_RAW_SP(val,X)		\
+  do {					\
+    if (!FP_INHIBIT_RESULTS)		\
+      _FP_PACK_RAW_1_P(S,val,X);	\
+  } while (0)
+
+#define FP_UNPACK_S(X,val)		\
+  do {					\
+    _FP_UNPACK_RAW_1(S,X,val);		\
+    _FP_UNPACK_CANONICAL(S,1,X);	\
+  } while (0)
+
+#define FP_UNPACK_SP(X,val)		\
+  do {					\
+    _FP_UNPACK_RAW_1_P(S,X,val);	\
+    _FP_UNPACK_CANONICAL(S,1,X);	\
+  } while (0)
+
+#define FP_PACK_S(val,X)		\
+  do {					\
+    _FP_PACK_CANONICAL(S,1,X);		\
+    _FP_PACK_RAW_1(S,val,X);		\
+  } while (0)
+
+#define FP_PACK_SP(val,X)		\
+  do {					\
+    _FP_PACK_CANONICAL(S,1,X);		\
+    if (!FP_INHIBIT_RESULTS)		\
+      _FP_PACK_RAW_1_P(S,val,X);	\
+  } while (0)
+
+#define FP_ISSIGNAN_S(X)		_FP_ISSIGNAN(S,1,X)
+#define FP_NEG_S(R,X)			_FP_NEG(S,1,R,X)
+#define FP_ADD_S(R,X,Y)			_FP_ADD(S,1,R,X,Y)
+#define FP_SUB_S(R,X,Y)			_FP_SUB(S,1,R,X,Y)
+#define FP_MUL_S(R,X,Y)			_FP_MUL(S,1,R,X,Y)
+#define FP_DIV_S(R,X,Y)			_FP_DIV(S,1,R,X,Y)
+#define FP_SQRT_S(R,X)			_FP_SQRT(S,1,R,X)
+#define _FP_SQRT_MEAT_S(R,S,T,X,Q)	_FP_SQRT_MEAT_1(R,S,T,X,Q)
+
+#define FP_CMP_S(r,X,Y,un)	_FP_CMP(S,1,r,X,Y,un)
+#define FP_CMP_EQ_S(r,X,Y)	_FP_CMP_EQ(S,1,r,X,Y)
+
+#define FP_TO_INT_S(r,X,rsz,rsg)	_FP_TO_INT(S,1,r,X,rsz,rsg)
+#define FP_TO_INT_ROUND_S(r,X,rsz,rsg)	_FP_TO_INT_ROUND(S,1,r,X,rsz,rsg)
+#define FP_FROM_INT_S(X,r,rs,rt)	_FP_FROM_INT(S,1,X,r,rs,rt)
+
+#define _FP_FRAC_HIGH_S(X)	_FP_FRAC_HIGH_1(X)
+#define _FP_FRAC_HIGH_RAW_S(X)	_FP_FRAC_HIGH_1(X)
+
+#endif /* __MATH_EMU_SINGLE_H__ */