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[66.27.222.29]) by smtp.gmail.com with ESMTPSA id m10sm6042358pjs.25.2021.01.28.14.42.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 28 Jan 2021 14:42:10 -0800 (PST) From: Richard Henderson To: qemu-devel@nongnu.org Subject: [PATCH v4 16/23] linux-user/aarch64: Implement PROT_MTE Date: Thu, 28 Jan 2021 12:41:34 -1000 Message-Id: <20210128224141.638790-17-richard.henderson@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210128224141.638790-1-richard.henderson@linaro.org> References: <20210128224141.638790-1-richard.henderson@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2607:f8b0:4864:20::52d; envelope-from=richard.henderson@linaro.org; helo=mail-pg1-x52d.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 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: peter.maydell@linaro.org, qemu-arm@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Remember the PROT_MTE bit as PAGE_MTE/PAGE_TARGET_2. Otherwise this does not yet have effect. Reviewed-by: Peter Maydell Signed-off-by: Richard Henderson --- v3: Do not overlap PAGE_TARGET_2 with PAGE_RESERVED. --- include/exec/cpu-all.h | 1 + linux-user/syscall_defs.h | 1 + target/arm/cpu.h | 1 + linux-user/mmap.c | 22 ++++++++++++++-------- 4 files changed, 17 insertions(+), 8 deletions(-) diff --git a/include/exec/cpu-all.h b/include/exec/cpu-all.h index c52180e8e6..b2a72f70ec 100644 --- a/include/exec/cpu-all.h +++ b/include/exec/cpu-all.h @@ -284,6 +284,7 @@ extern intptr_t qemu_host_page_mask; #endif /* Target-specific bits that will be used via page_get_flags(). */ #define PAGE_TARGET_1 0x0080 +#define PAGE_TARGET_2 0x0200 #if defined(CONFIG_USER_ONLY) void page_dump(FILE *f); diff --git a/linux-user/syscall_defs.h b/linux-user/syscall_defs.h index f98c1c1c8d..46a960fccb 100644 --- a/linux-user/syscall_defs.h +++ b/linux-user/syscall_defs.h @@ -1311,6 +1311,7 @@ struct target_winsize { #ifdef TARGET_AARCH64 #define TARGET_PROT_BTI 0x10 +#define TARGET_PROT_MTE 0x20 #endif /* Common */ diff --git a/target/arm/cpu.h b/target/arm/cpu.h index 0db6e65467..7a79dde6f6 100644 --- a/target/arm/cpu.h +++ b/target/arm/cpu.h @@ -3605,6 +3605,7 @@ static inline MemTxAttrs *typecheck_memtxattrs(MemTxAttrs *x) * AArch64 usage of the PAGE_TARGET_* bits for linux-user. */ #define PAGE_BTI PAGE_TARGET_1 +#define PAGE_MTE PAGE_TARGET_2 #ifdef TARGET_TAGGED_ADDRESSES /** diff --git a/linux-user/mmap.c b/linux-user/mmap.c index 7fb4c628e1..34bd114f97 100644 --- a/linux-user/mmap.c +++ b/linux-user/mmap.c @@ -84,18 +84,24 @@ static int validate_prot_to_pageflags(int *host_prot, int prot) | (prot & PROT_EXEC ? PROT_READ : 0); #ifdef TARGET_AARCH64 - /* - * The PROT_BTI bit is only accepted if the cpu supports the feature. - * Since this is the unusual case, don't bother checking unless - * the bit has been requested. If set and valid, record the bit - * within QEMU's page_flags. - */ - if (prot & TARGET_PROT_BTI) { + { ARMCPU *cpu = ARM_CPU(thread_cpu); - if (cpu_isar_feature(aa64_bti, cpu)) { + + /* + * The PROT_BTI bit is only accepted if the cpu supports the feature. + * Since this is the unusual case, don't bother checking unless + * the bit has been requested. If set and valid, record the bit + * within QEMU's page_flags. + */ + if ((prot & TARGET_PROT_BTI) && cpu_isar_feature(aa64_bti, cpu)) { valid |= TARGET_PROT_BTI; page_flags |= PAGE_BTI; } + /* Similarly for the PROT_MTE bit. */ + if ((prot & TARGET_PROT_MTE) && cpu_isar_feature(aa64_mte, cpu)) { + valid |= TARGET_PROT_MTE; + page_flags |= PAGE_MTE; + } } #endif -- 2.25.1