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Thu, 15 Aug 2024 07:49:17 -0700 (PDT) From: =?UTF-8?q?Alex=20Benn=C3=A9e?= To: qemu-devel@nongnu.org Cc: =?UTF-8?q?Alex=20Benn=C3=A9e?= , Alexandre Iooss , Richard Henderson , Paolo Bonzini , Eduardo Habkost Subject: [PULL 07/21] target/i386: allow access_ptr to force slow path on failed probe Date: Thu, 15 Aug 2024 15:48:57 +0100 Message-Id: <20240815144911.1931487-8-alex.bennee@linaro.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240815144911.1931487-1-alex.bennee@linaro.org> References: <20240815144911.1931487-1-alex.bennee@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" 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=2a00:1450:4864:20::636; envelope-from=alex.bennee@linaro.org; helo=mail-ej1-x636.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @linaro.org) X-ZM-MESSAGEID: 1723733389868116600 When we are using TCG plugin memory callbacks probe_access_internal will return TLB_MMIO to force the slow path for memory access. This results in probe_access returning NULL but the x86 access_ptr function happily accepts an empty haddr resulting in segfault hilarity. Check for an empty haddr to prevent the segfault and enable plugins to track all the memory operations for the x86 save/restore helpers. As we also want to run the slow path when instrumenting *-user we should also not have the short cutting test_ptr macro. Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2489 Fixes: 6d03226b42 (plugins: force slow path when plugins instrument memory = ops) Reviewed-by: Alexandre Iooss Reviewed-by: Richard Henderson Signed-off-by: Alex Benn=C3=A9e Message-Id: <20240813202329.1237572-8-alex.bennee@linaro.org> diff --git a/target/i386/tcg/access.c b/target/i386/tcg/access.c index 56a1181ea5..e68b73a24b 100644 --- a/target/i386/tcg/access.c +++ b/target/i386/tcg/access.c @@ -58,6 +58,11 @@ static void *access_ptr(X86Access *ac, vaddr addr, unsig= ned len) =20 assert(addr >=3D ac->vaddr); =20 + /* No haddr means probe_access wants to force slow path */ + if (!ac->haddr1) { + return NULL; + } + #ifdef CONFIG_USER_ONLY assert(offset <=3D ac->size1 - len); return ac->haddr1 + offset; @@ -78,17 +83,11 @@ static void *access_ptr(X86Access *ac, vaddr addr, unsi= gned len) #endif } =20 -#ifdef CONFIG_USER_ONLY -# define test_ptr(p) true -#else -# define test_ptr(p) likely(p) -#endif - uint8_t access_ldb(X86Access *ac, vaddr addr) { void *p =3D access_ptr(ac, addr, sizeof(uint8_t)); =20 - if (test_ptr(p)) { + if (likely(p)) { return ldub_p(p); } return cpu_ldub_mmuidx_ra(ac->env, addr, ac->mmu_idx, ac->ra); @@ -98,7 +97,7 @@ uint16_t access_ldw(X86Access *ac, vaddr addr) { void *p =3D access_ptr(ac, addr, sizeof(uint16_t)); =20 - if (test_ptr(p)) { + if (likely(p)) { return lduw_le_p(p); } return cpu_lduw_le_mmuidx_ra(ac->env, addr, ac->mmu_idx, ac->ra); @@ -108,7 +107,7 @@ uint32_t access_ldl(X86Access *ac, vaddr addr) { void *p =3D access_ptr(ac, addr, sizeof(uint32_t)); =20 - if (test_ptr(p)) { + if (likely(p)) { return ldl_le_p(p); } return cpu_ldl_le_mmuidx_ra(ac->env, addr, ac->mmu_idx, ac->ra); @@ -118,7 +117,7 @@ uint64_t access_ldq(X86Access *ac, vaddr addr) { void *p =3D access_ptr(ac, addr, sizeof(uint64_t)); =20 - if (test_ptr(p)) { + if (likely(p)) { return ldq_le_p(p); } return cpu_ldq_le_mmuidx_ra(ac->env, addr, ac->mmu_idx, ac->ra); @@ -128,7 +127,7 @@ void access_stb(X86Access *ac, vaddr addr, uint8_t val) { void *p =3D access_ptr(ac, addr, sizeof(uint8_t)); =20 - if (test_ptr(p)) { + if (likely(p)) { stb_p(p, val); } else { cpu_stb_mmuidx_ra(ac->env, addr, val, ac->mmu_idx, ac->ra); @@ -139,7 +138,7 @@ void access_stw(X86Access *ac, vaddr addr, uint16_t val) { void *p =3D access_ptr(ac, addr, sizeof(uint16_t)); =20 - if (test_ptr(p)) { + if (likely(p)) { stw_le_p(p, val); } else { cpu_stw_le_mmuidx_ra(ac->env, addr, val, ac->mmu_idx, ac->ra); @@ -150,7 +149,7 @@ void access_stl(X86Access *ac, vaddr addr, uint32_t val) { void *p =3D access_ptr(ac, addr, sizeof(uint32_t)); =20 - if (test_ptr(p)) { + if (likely(p)) { stl_le_p(p, val); } else { cpu_stl_le_mmuidx_ra(ac->env, addr, val, ac->mmu_idx, ac->ra); @@ -161,7 +160,7 @@ void access_stq(X86Access *ac, vaddr addr, uint64_t val) { void *p =3D access_ptr(ac, addr, sizeof(uint64_t)); =20 - if (test_ptr(p)) { + if (likely(p)) { stq_le_p(p, val); } else { cpu_stq_le_mmuidx_ra(ac->env, addr, val, ac->mmu_idx, ac->ra); --=20 2.39.2