linux-kernel - [PATCH 5.10 392/717] powerpc/sstep: Emulate prefixed instructions only when CPU_FTR_ARCH

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Date:   Mon, 28 Dec 2020 13:46:30 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Balamuruhan S <bala24@...ux.ibm.com>,
        Ravi Bangoria <ravi.bangoria@...ux.ibm.com>,
        Sandipan Das <sandipan@...ux.ibm.com>,
        Daniel Axtens <dja@...ens.net>,
        Michael Ellerman <mpe@...erman.id.au>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.10 392/717] powerpc/sstep: Emulate prefixed instructions only when CPU_FTR_ARCH_31 is set

From: Balamuruhan S <bala24@...ux.ibm.com>

[ Upstream commit ef6879f8c8053cc3b493f400a06d452d7fb13650 ]

Unconditional emulation of prefixed instructions will allow
emulation of them on Power10 predecessors which might cause
issues. Restrict that.

Fixes: 3920742b92f5 ("powerpc sstep: Add support for prefixed fixed-point arithmetic")
Fixes: 50b80a12e4cc ("powerpc sstep: Add support for prefixed load/stores")
Signed-off-by: Balamuruhan S <bala24@...ux.ibm.com>
Signed-off-by: Ravi Bangoria <ravi.bangoria@...ux.ibm.com>
Reviewed-by: Sandipan Das <sandipan@...ux.ibm.com>
Reviewed-by: Daniel Axtens <dja@...ens.net>
Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
Link: https://lore.kernel.org/r/20201011050908.72173-2-ravi.bangoria@linux.ibm.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/powerpc/lib/sstep.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/powerpc/lib/sstep.c b/arch/powerpc/lib/sstep.c
index 855457ed09b54..bf2cd3d42125d 100644
--- a/arch/powerpc/lib/sstep.c
+++ b/arch/powerpc/lib/sstep.c
@@ -1346,6 +1346,9 @@ int analyse_instr(struct instruction_op *op, const struct pt_regs *regs,
 	switch (opcode) {
 #ifdef __powerpc64__
 	case 1:
+		if (!cpu_has_feature(CPU_FTR_ARCH_31))
+			return -1;
+
 		prefix_r = GET_PREFIX_R(word);
 		ra = GET_PREFIX_RA(suffix);
 		rd = (suffix >> 21) & 0x1f;
@@ -2733,6 +2736,9 @@ int analyse_instr(struct instruction_op *op, const struct pt_regs *regs,
 		}
 		break;
 	case 1: /* Prefixed instructions */
+		if (!cpu_has_feature(CPU_FTR_ARCH_31))
+			return -1;
+
 		prefix_r = GET_PREFIX_R(word);
 		ra = GET_PREFIX_RA(suffix);
 		op->update_reg = ra;
-- 
2.27.0