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([2602:ae:1544:6601:6705:aa17:3641:e634]) by smtp.gmail.com with ESMTPSA id d2-20020a17090a6f0200b0023440af7aafsm7902708pjk.9.2023.03.27.14.18.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 27 Mar 2023 14:18:36 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1679951917; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=7lxGf1yuxDu4kIT1pIcReLXt+iruvwgyqtSwsIeLLWw=; b=pGr4z01WQZ7l2fDcHgqFnsWBdzt0IAmW7MgQ8W+m5lIgSosjj6MTxWQ/XfGx1DzWzy Jq9R8ZkecENWdYzfRjWIjA2epoyxiU0BqwT7kHxyLRr6pi+5JzEnUPkR0J1Ned2/78Sm CEOeq2lEgVVNC9TIarHzjW5FywohUKWWdFlzX0Pv6ik0WCsIqiPC7pdB3oXrAjHMMADM cB9tNY7OZo13NNlt3d/OUMwSdAntSrgUKn17NoAAyCgTTP5eiiciOXfBpq8rGiyo+Ih6 qM27ZXgJPj4Fo+j5VscKhSk70YyivJvQsRNjjZZ/yGdinDhx08ls+3HuSqnZeiYJGx6g 0U0A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1679951917; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=7lxGf1yuxDu4kIT1pIcReLXt+iruvwgyqtSwsIeLLWw=; b=EvgscuN1v0ozz2P6iR+OkZ++w1Is6qiROF1j8cjQkCgSIff5ViPlJrvVNYOm+VbbTA sbAXfx8U/JtWN4uBH7MB1wxF4jb7GXlCCKF8COHWLuD7jY34mxTvIamwp4fOwI7lFG1K OATzs9scUo7aAdW+3djxYsbs2t6S7ob+Ih3g0O9ixG10fVMnwEUvXMV/gZXflkw+M2iC IpNivPp06BgEsIoQp9v5OA5QADCQw2s02dHXdjz2OW6ohc+WdYkqa53ZXRto3LYdmFuN 0tFkn85gXoeiBb86wvxTKcOlNoNzbPSZfcnXs4hlIqfB4+964l/wSZDhKbUmGc/j0Jzn HFEg== X-Gm-Message-State: AAQBX9evD8OJpD9f9PHajy8/hcTPYD/bo5yNyDwQX6QDRZNJct6W1zkM KVoxaVOgl6r8xvRcaOMkc5onDeUy4NwtUIjd+/k= X-Google-Smtp-Source: AKy350YPn52mPAe+l4+gSNEZVeHrDwkkOpncD8fU6G10rRVyPSxGsrZl5HvdC892PZX+d7ZATWaX1A== X-Received: by 2002:a17:90b:1b47:b0:23d:5040:a88d with SMTP id nv7-20020a17090b1b4700b0023d5040a88dmr14170607pjb.14.1679951916872; Mon, 27 Mar 2023 14:18:36 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Cc: alex.bennee@linaro.org, philmd@linaro.org Subject: [PATCH for-8.0 v2 12/12] linux-user/arm: Take more care allocating commpage Date: Mon, 27 Mar 2023 14:18:24 -0700 Message-Id: <20230327211824.1785547-13-richard.henderson@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230327211824.1785547-1-richard.henderson@linaro.org> References: <20230327211824.1785547-1-richard.henderson@linaro.org> MIME-Version: 1.0 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=2607:f8b0:4864:20::62f; envelope-from=richard.henderson@linaro.org; helo=mail-pl1-x62f.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: 2.1.29 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: 1679951967074100003 Content-Type: text/plain; charset="utf-8" User setting of -R reserved_va can lead to an assertion failure in page_set_flags. Sanity check the value of reserved_va and print an error message instead. Do not allocate a commpage at all for m-profile cpus. Signed-off-by: Richard Henderson --- linux-user/elfload.c | 37 +++++++++++++++++++++++++++---------- 1 file changed, 27 insertions(+), 10 deletions(-) diff --git a/linux-user/elfload.c b/linux-user/elfload.c index f1370a7a8b..b96b3e566b 100644 --- a/linux-user/elfload.c +++ b/linux-user/elfload.c @@ -423,12 +423,32 @@ enum { =20 static bool init_guest_commpage(void) { - abi_ptr commpage =3D HI_COMMPAGE & -qemu_host_page_size; - void *want =3D g2h_untagged(commpage); - void *addr =3D mmap(want, qemu_host_page_size, PROT_READ | PROT_WRITE, - MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, -1, 0); + ARMCPU *cpu =3D ARM_CPU(thread_cpu); + abi_ptr want =3D HI_COMMPAGE & TARGET_PAGE_MASK; + abi_ptr addr; =20 - if (addr =3D=3D MAP_FAILED) { + /* + * M-profile allocates maximum of 2GB address space, so can never + * allocate the commpage. Skip it. + */ + if (arm_feature(&cpu->env, ARM_FEATURE_M)) { + return true; + } + + /* + * If reserved_va does not cover the commpage, we get an assert + * in page_set_flags. Produce an intelligent error instead. + */ + if (reserved_va !=3D 0 && want + TARGET_PAGE_SIZE - 1 > reserved_va) { + error_report("Allocating guest commpage: -R 0x%" PRIx64 " too smal= l", + (uint64_t)reserved_va + 1); + exit(EXIT_FAILURE); + } + + addr =3D target_mmap(want, TARGET_PAGE_SIZE, PROT_READ | PROT_WRITE, + MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, -1, 0); + + if (addr =3D=3D -1) { perror("Allocating guest commpage"); exit(EXIT_FAILURE); } @@ -437,15 +457,12 @@ static bool init_guest_commpage(void) } =20 /* Set kernel helper versions; rest of page is 0. */ - __put_user(5, (uint32_t *)g2h_untagged(0xffff0ffcu)); + put_user_u32(5, 0xffff0ffcu); =20 - if (mprotect(addr, qemu_host_page_size, PROT_READ)) { + if (target_mprotect(addr, qemu_host_page_size, PROT_READ | PROT_EXEC))= { perror("Protecting guest commpage"); exit(EXIT_FAILURE); } - - page_set_flags(commpage, commpage | ~qemu_host_page_mask, - PAGE_READ | PAGE_EXEC | PAGE_VALID); return true; } =20 --=20 2.34.1