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91 lines
3.6 KiB
91 lines
3.6 KiB
9 months ago
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From b83e60b3a2488e988986f2c7e63cb7eb40d7cf27 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= <clg@redhat.com>
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Date: Tue, 23 May 2023 12:34:33 +0200
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Subject: [PATCH 20/22] target/s390x/tcg: Fix and improve the SACF instruction
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Cédric Le Goater <clg@redhat.com>
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RH-MergeRequest: 279: Backport latest s390x-related fixes from upstream QEMU for qemu-kvm in RHEL 8.9
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RH-Bugzilla: 2169308 2209605
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RH-Acked-by: Thomas Huth <thuth@redhat.com>
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RH-Acked-by: David Hildenbrand <david@redhat.com>
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RH-Acked-by: Cornelia Huck <cohuck@redhat.com>
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RH-Commit: [19/21] 62030baceb0b0d1d651ba9026bb419ed4b2a8149
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Bugzilla: https://bugzilla.redhat.com/2169308
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commit 21be74a9a59d1e4954ebb59dcbee0fda0b19de00
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Author: Thomas Huth <thuth@redhat.com>
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Date: Thu Dec 1 19:44:43 2022 +0100
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target/s390x/tcg: Fix and improve the SACF instruction
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The SET ADDRESS SPACE CONTROL FAST instruction is not privileged, it can be
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used from problem space, too. Just the switching to the home address space
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is privileged and should still generate a privilege exception. This bug is
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e.g. causing programs like Java that use the "getcpu" vdso kernel function
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to crash (see https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=990417#26 ).
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While we're at it, also check if DAT is not enabled. In that case the
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instruction is supposed to generate a special operation exception.
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Resolves: https://gitlab.com/qemu-project/qemu/-/issues/655
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Message-Id: <20221201184443.136355-1-thuth@redhat.com>
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Reviewed-by: Ilya Leoshkevich <iii@linux.ibm.com>
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Reviewed-by: David Hildenbrand <david@redhat.com>
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Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
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Signed-off-by: Thomas Huth <thuth@redhat.com>
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Conflicts:
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file rename target/s390x/tcg/insn-data.h.in -> insn-data.def
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Signed-off-by: Cédric Le Goater <clg@redhat.com>
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---
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target/s390x/tcg/cc_helper.c | 7 +++++++
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target/s390x/tcg/insn-data.def | 2 +-
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2 files changed, 8 insertions(+), 1 deletion(-)
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diff --git a/target/s390x/tcg/cc_helper.c b/target/s390x/tcg/cc_helper.c
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index b2e8d3d9f5..b36f8cdc8b 100644
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--- a/target/s390x/tcg/cc_helper.c
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+++ b/target/s390x/tcg/cc_helper.c
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@@ -487,6 +487,10 @@ void HELPER(sacf)(CPUS390XState *env, uint64_t a1)
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{
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HELPER_LOG("%s: %16" PRIx64 "\n", __func__, a1);
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+ if (!(env->psw.mask & PSW_MASK_DAT)) {
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+ tcg_s390_program_interrupt(env, PGM_SPECIAL_OP, GETPC());
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+ }
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+
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switch (a1 & 0xf00) {
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case 0x000:
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env->psw.mask &= ~PSW_MASK_ASC;
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@@ -497,6 +501,9 @@ void HELPER(sacf)(CPUS390XState *env, uint64_t a1)
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env->psw.mask |= PSW_ASC_SECONDARY;
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break;
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case 0x300:
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+ if ((env->psw.mask & PSW_MASK_PSTATE) != 0) {
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+ tcg_s390_program_interrupt(env, PGM_PRIVILEGED, GETPC());
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+ }
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env->psw.mask &= ~PSW_MASK_ASC;
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env->psw.mask |= PSW_ASC_HOME;
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break;
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diff --git a/target/s390x/tcg/insn-data.def b/target/s390x/tcg/insn-data.def
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index d54673a3ba..548b0eedc2 100644
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--- a/target/s390x/tcg/insn-data.def
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+++ b/target/s390x/tcg/insn-data.def
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@@ -1315,7 +1315,7 @@
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/* SERVICE CALL LOGICAL PROCESSOR (PV hypercall) */
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F(0xb220, SERVC, RRE, Z, r1_o, r2_o, 0, 0, servc, 0, IF_PRIV | IF_IO)
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/* SET ADDRESS SPACE CONTROL FAST */
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- F(0xb279, SACF, S, Z, 0, a2, 0, 0, sacf, 0, IF_PRIV)
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+ C(0xb279, SACF, S, Z, 0, a2, 0, 0, sacf, 0)
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/* SET CLOCK */
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F(0xb204, SCK, S, Z, la2, 0, 0, 0, sck, 0, IF_PRIV | IF_IO)
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/* SET CLOCK COMPARATOR */
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--
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2.37.3
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