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([148.252.133.210]) by smtp.gmail.com with ESMTPSA id e17-20020a5d4e91000000b0031433760a92sm9635256wru.115.2023.07.09.11.33.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 09 Jul 2023 11:33:31 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1688927612; x=1691519612; 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=Tw+lHuhQDkl8BHlJVK/TymddlbqOTxzC1UGZ1En8Tes=; b=UvYjNgBIl4rFgkHQ+ucXCccsdPHZvz0zzQ2m2UAxjRcoK4Pq7/Zk5hOFe7HF5NEDl/ F3wIF5YLkaoMC9zrWhYcZpz+8tTXtEf2BV9S78J/905R+6PvsxI0duzG+DdKEJZFLXWF BZVpS1xTwzPsV6XlXh1RFREbB4VFm5viAZPwpe1d+HSa6QIA3nLKnU1bNkqC6eAjEj6p Z9OUmjB0y6+huTFxGssMdRy+dIgMaGUHZu0GNoJs9p+Tx3KLuvuNO2YQEmT+jVkk7JIt SStiweAv69RwjczpvEx+ELjacjmYAnNYgR0WSycwpaXzdc+9QYzEl1jo4uO75dNeU7YG CWrg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1688927612; x=1691519612; 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=Tw+lHuhQDkl8BHlJVK/TymddlbqOTxzC1UGZ1En8Tes=; b=RBOw+trl9O2ZC/mqFS/UYYW+4h1kipIsS7P4rdh87co/6o12IQPLYV+V9PWyNNuBVF 4ly7V/6bjO7+z+wd9ZOPP5Hs0PQz258F123YoJa9cdtuUzhvjAnAjIxscuyqM9omsZ+I R66xuw8xBVosZ6jkXxRwymv/xP4kRb4lK/ApelDzfKxVq/lNNHGK4Pqef9QjYBui7pI9 FUHVxuq7j2rXnu+pII0CrnxtsZVHuTh0vlSWXjlLjNLqUTb7aVzeVkKbejEHh32Yc4+8 IG8p0fTwW1lnwpg+eKWhe7X5coxQfrRmRgVif0Ljn2eJPZB+mQa+jD3iN5oulRiGV4eH OGXQ== X-Gm-Message-State: ABy/qLbVazWtewG4mIX2znqAt+pyBheyuBV0G2+6SgG++t+XKuGhXscI Ze2SXfmk23/mynNc4Q92i4QWerCtl0L7LDUeYyCN9Q== X-Google-Smtp-Source: APBJJlEFoi90emDeeLOqJVQ6LxOJepZtEw6jNVk2SiusMa1BytxWIIm5VlySZxeUb0r4hLwuSYaiTg== X-Received: by 2002:adf:ec90:0:b0:314:545f:6e94 with SMTP id z16-20020adfec90000000b00314545f6e94mr9968414wrn.65.1688927611853; Sun, 09 Jul 2023 11:33:31 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Cc: laurent@vivier.eu Subject: [PATCH 33/45] accel/tcg: Introduce page_find_range_empty Date: Sun, 9 Jul 2023 19:29:17 +0100 Message-Id: <20230709182934.309468-66-richard.henderson@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230709182934.309468-1-richard.henderson@linaro.org> References: <20230709182934.309468-1-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=2a00:1450:4864:20::435; envelope-from=richard.henderson@linaro.org; helo=mail-wr1-x435.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: 1688928203853100001 Content-Type: text/plain; charset="utf-8" Use the interval tree to locate an unused range in the VM. Signed-off-by: Richard Henderson Message-Id: <20230707204054.8792-17-richard.henderson@linaro.org> --- include/exec/cpu-all.h | 15 +++++++++++++++ accel/tcg/user-exec.c | 41 +++++++++++++++++++++++++++++++++++++++++ 2 files changed, 56 insertions(+) diff --git a/include/exec/cpu-all.h b/include/exec/cpu-all.h index 94f828b109..eb1c54701a 100644 --- a/include/exec/cpu-all.h +++ b/include/exec/cpu-all.h @@ -236,6 +236,21 @@ int page_check_range(target_ulong start, target_ulong = len, int flags); */ bool page_check_range_empty(target_ulong start, target_ulong last); =20 +/** + * page_find_range_empty + * @min: first byte of search range + * @max: last byte of search range + * @len: size of the hole required + * @align: alignment of the hole required (power of 2) + * + * If there is a range [x, x+@len) within [@min, @max] such that + * x % @align =3D=3D 0, then return x. Otherwise return -1. + * The memory lock must be held, as the caller will want to ensure + * the returned range stays empty until a new mapping can be installed. + */ +target_ulong page_find_range_empty(target_ulong min, target_ulong max, + target_ulong len, target_ulong align); + /** * page_get_target_data(address) * @address: guest virtual address diff --git a/accel/tcg/user-exec.c b/accel/tcg/user-exec.c index ab684a3ea2..e4f9563730 100644 --- a/accel/tcg/user-exec.c +++ b/accel/tcg/user-exec.c @@ -605,6 +605,47 @@ bool page_check_range_empty(target_ulong start, target= _ulong last) return pageflags_find(start, last) =3D=3D NULL; } =20 +target_ulong page_find_range_empty(target_ulong min, target_ulong max, + target_ulong len, target_ulong align) +{ + target_ulong len_m1, align_m1; + + assert(min <=3D max); + assert(max <=3D GUEST_ADDR_MAX); + assert(len !=3D 0); + assert(is_power_of_2(align)); + assert_memory_lock(); + + len_m1 =3D len - 1; + align_m1 =3D align - 1; + + /* Iteratively narrow the search region. */ + while (1) { + PageFlagsNode *p; + + /* Align min and double-check there's enough space remaining. */ + min =3D (min + align_m1) & ~align_m1; + if (min > max) { + return -1; + } + if (len_m1 > max - min) { + return -1; + } + + p =3D pageflags_find(min, min + len_m1); + if (p =3D=3D NULL) { + /* Found! */ + return min; + } + if (max <=3D p->itree.last) { + /* Existing allocation fills the remainder of the search regio= n. */ + return -1; + } + /* Skip across existing allocation. */ + min =3D p->itree.last + 1; + } +} + void page_protect(tb_page_addr_t address) { PageFlagsNode *p; --=20 2.34.1