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bh=R10Uma00jiRRBhn6TPY6a32UuH6QsCQ1QGjdoym9uAs=; b=ThDNtip6A4yAcEOMvxnFyJCRodxWx8wwlAIQxf2gEQW83t+osbeZ+6K5LEGmf7qPVUHOI9 IDdlA9F3Qf5qziqmzCtupPLWqX0dYZlNn+AtP8pySpeq8eYalHDnTk1rq1PH0YZWE8vbso iR56GgcC5qtW+bEziBZlPRzADD8hbjk= X-MC-Unique: mHvh02NrPhCBRscUIaSoeA-1 From: David Hildenbrand To: qemu-devel@nongnu.org Subject: [PATCH v6 1/2] target/s390x: Implement the MVPG condition-code-option bit Date: Thu, 11 Mar 2021 20:44:25 +0100 Message-Id: <20210311194426.149044-2-david@redhat.com> In-Reply-To: <20210311194426.149044-1-david@redhat.com> References: <20210311194426.149044-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=david@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=63.128.21.124; envelope-from=david@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -29 X-Spam_score: -3.0 X-Spam_bar: --- X-Spam_report: (-3.0 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.25, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: qemu-s390x@nongnu.org, Cornelia Huck , Richard Henderson , Thomas Huth , David Hildenbrand Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" From: Richard Henderson If the CCO bit is set, MVPG should not generate an exception but report page translation faults via a CC code. Create a new helper, access_prepare_nf, which can use probe_access_flags in non-faulting mode, and then handle watchpoints. Signed-off-by: Richard Henderson [thuth: Added logic to still inject protection exceptions] Signed-off-by: Thomas Huth [david: Look at env->tlb_fill_exc to determine if there was an exception] Signed-off-by: David Hildenbrand Reviewed-by: Richard Henderson --- target/s390x/cpu.h | 5 ++ target/s390x/excp_helper.c | 3 + target/s390x/mem_helper.c | 136 ++++++++++++++++++++++++++++++------- 3 files changed, 121 insertions(+), 23 deletions(-) diff --git a/target/s390x/cpu.h b/target/s390x/cpu.h index 60d434d5ed..468b4430f3 100644 --- a/target/s390x/cpu.h +++ b/target/s390x/cpu.h @@ -114,6 +114,11 @@ struct CPUS390XState { =20 uint64_t diag318_info; =20 +#if !defined(CONFIG_USER_ONLY) + uint64_t tlb_fill_tec; /* translation exception code during tlb_fill= */ + int tlb_fill_exc; /* exception number seen during tlb_fill */ +#endif + /* Fields up to this point are cleared by a CPU reset */ struct {} end_reset_fields; =20 diff --git a/target/s390x/excp_helper.c b/target/s390x/excp_helper.c index ce16af394b..c48cd6b46f 100644 --- a/target/s390x/excp_helper.c +++ b/target/s390x/excp_helper.c @@ -164,6 +164,9 @@ bool s390_cpu_tlb_fill(CPUState *cs, vaddr address, int= size, tec =3D 0; /* unused */ } =20 + env->tlb_fill_exc =3D excp; + env->tlb_fill_tec =3D tec; + if (!excp) { qemu_log_mask(CPU_LOG_MMU, "%s: set tlb %" PRIx64 " -> %" PRIx64 " (%x)\n", diff --git a/target/s390x/mem_helper.c b/target/s390x/mem_helper.c index 25cfede806..6f6e2f80f4 100644 --- a/target/s390x/mem_helper.c +++ b/target/s390x/mem_helper.c @@ -130,28 +130,103 @@ typedef struct S390Access { int mmu_idx; } S390Access; =20 -static S390Access access_prepare(CPUS390XState *env, vaddr vaddr, int size, - MMUAccessType access_type, int mmu_idx, - uintptr_t ra) +/* + * With nonfault=3D1, return the PGM_ exception that would have been injec= ted + * into the guest; return 0 if no exception was detected. + * + * For !CONFIG_USER_ONLY, the TEC is stored stored to env->tlb_fill_tec. + * For CONFIG_USER_ONLY, the faulting address is stored to env->__excp_add= r. + */ +static int s390_probe_access(CPUArchState *env, target_ulong addr, int siz= e, + MMUAccessType access_type, int mmu_idx, + bool nonfault, void **phost, uintptr_t ra) { - S390Access access =3D { - .vaddr1 =3D vaddr, - .size1 =3D MIN(size, -(vaddr | TARGET_PAGE_MASK)), - .mmu_idx =3D mmu_idx, - }; + int flags; =20 - g_assert(size > 0 && size <=3D 4096); - access.haddr1 =3D probe_access(env, access.vaddr1, access.size1, acces= s_type, - mmu_idx, ra); +#if defined(CONFIG_USER_ONLY) + flags =3D page_get_flags(addr); + if (!(flags & (access_type =3D=3D MMU_DATA_LOAD ? PAGE_READ : PAGE_WR= ITE))) { + env->__excp_addr =3D addr; + flags =3D (flags & PAGE_VALID) ? PGM_PROTECTION : PGM_ADDRESSING; + if (nonfault) { + return flags; + } + tcg_s390_program_interrupt(env, flags, ra); + } + *phost =3D g2h(env_cpu(env), addr); +#else + /* + * For !CONFIG_USER_ONLY, we cannot rely on TLB_INVALID_MASK or haddr= =3D=3DNULL + * to detect if there was an exception during tlb_fill(). + */ + env->tlb_fill_exc =3D 0; + flags =3D probe_access_flags(env, addr, access_type, mmu_idx, nonfault= , phost, + ra); + if (env->tlb_fill_exc) { + return env->tlb_fill_exc; + } =20 - if (unlikely(access.size1 !=3D size)) { - /* The access crosses page boundaries. */ - access.vaddr2 =3D wrap_address(env, vaddr + access.size1); - access.size2 =3D size - access.size1; - access.haddr2 =3D probe_access(env, access.vaddr2, access.size2, - access_type, mmu_idx, ra); + if (unlikely(flags & TLB_WATCHPOINT)) { + /* S390 does not presently use transaction attributes. */ + cpu_check_watchpoint(env_cpu(env), addr, size, + MEMTXATTRS_UNSPECIFIED, + (access_type =3D=3D MMU_DATA_STORE + ? BP_MEM_WRITE : BP_MEM_READ), ra); } - return access; +#endif + return 0; +} + +static int access_prepare_nf(S390Access *access, CPUS390XState *env, + bool nonfault, vaddr vaddr1, int size, + MMUAccessType access_type, + int mmu_idx, uintptr_t ra) +{ + void *haddr1, *haddr2 =3D NULL; + int size1, size2, exc; + vaddr vaddr2 =3D 0; + + assert(size > 0 && size <=3D 4096); + + size1 =3D MIN(size, -(vaddr1 | TARGET_PAGE_MASK)), + size2 =3D size - size1; + + exc =3D s390_probe_access(env, vaddr1, size1, access_type, mmu_idx, no= nfault, + &haddr1, ra); + if (exc) { + return exc; + } + if (unlikely(size2)) { + /* The access crosses page boundaries. */ + vaddr2 =3D wrap_address(env, vaddr1 + size1); + exc =3D s390_probe_access(env, vaddr2, size2, access_type, mmu_idx, + nonfault, &haddr2, ra); + if (exc) { + return exc; + } + } + + *access =3D (S390Access) { + .vaddr1 =3D vaddr1, + .vaddr2 =3D vaddr2, + .haddr1 =3D haddr1, + .haddr2 =3D haddr2, + .size1 =3D size1, + .size2 =3D size2, + .mmu_idx =3D mmu_idx + }; + return 0; +} + +static S390Access access_prepare(CPUS390XState *env, vaddr vaddr, int size, + MMUAccessType access_type, int mmu_idx, + uintptr_t ra) +{ + S390Access ret; + int exc =3D access_prepare_nf(&ret, env, false, vaddr, size, + access_type, mmu_idx, ra); + assert(!exc); + return ret; } =20 /* Helper to handle memset on a single page. */ @@ -845,8 +920,10 @@ uint32_t HELPER(mvpg)(CPUS390XState *env, uint64_t r0,= uint64_t r1, uint64_t r2) const int mmu_idx =3D cpu_mmu_index(env, false); const bool f =3D extract64(r0, 11, 1); const bool s =3D extract64(r0, 10, 1); + const bool cco =3D extract64(r0, 8, 1); uintptr_t ra =3D GETPC(); S390Access srca, desta; + int exc; =20 if ((f && s) || extract64(r0, 12, 4)) { tcg_s390_program_interrupt(env, PGM_SPECIFICATION, GETPC()); @@ -858,13 +935,26 @@ uint32_t HELPER(mvpg)(CPUS390XState *env, uint64_t r0= , uint64_t r1, uint64_t r2) /* * TODO: * - Access key handling - * - CC-option with surpression of page-translation exceptions * - Store r1/r2 register identifiers at real location 162 */ - srca =3D access_prepare(env, r2, TARGET_PAGE_SIZE, MMU_DATA_LOAD, mmu_= idx, - ra); - desta =3D access_prepare(env, r1, TARGET_PAGE_SIZE, MMU_DATA_STORE, mm= u_idx, - ra); + exc =3D access_prepare_nf(&srca, env, cco, r2, TARGET_PAGE_SIZE, + MMU_DATA_LOAD, mmu_idx, ra); + if (exc) { + return 2; + } + exc =3D access_prepare_nf(&desta, env, cco, r1, TARGET_PAGE_SIZE, + MMU_DATA_STORE, mmu_idx, ra); + if (exc) { +#if !defined(CONFIG_USER_ONLY) + if (exc =3D=3D PGM_PROTECTION) { + stq_phys(env_cpu(env)->as, + env->psa + offsetof(LowCore, trans_exc_code), + env->tlb_fill_tec); + tcg_s390_program_interrupt(env, PGM_PROTECTION, ra); + } +#endif + return 1; + } access_memmove(env, &desta, &srca, ra); return 0; /* data moved */ } --=20 2.29.2