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Wed, 10 Jun 2026 00:54:56 -0700 (PDT) X-Received: by 2002:a17:903:2b0d:b0:2c1:b8af:18ab with SMTP id d9443c01a7336-2c1e847f410mr301013195ad.19.1781078095895; Wed, 10 Jun 2026 00:54:55 -0700 (PDT) From: Dominique Martinet Date: Wed, 10 Jun 2026 07:54:52 +0000 Subject: [PATCH] linux-user: add preadv2/preadv2 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260610-preadv2-v1-1-cac1737308bd@atmark-techno.com> X-B4-Tracking: v=1; b=H4sIAEsYKWoC/6tWKk4tykwtVrJSqFYqSi3LLM7MzwNyDHUUlJIzE vPSU3UzU4B8JSMDIzMDM0MD3YKi1MSUMiNdMzNDM0MTI/MUMyNzJaBqoHhaZgXYpOjY2loANlF Ml1kAAAA= X-Change-ID: 20260610-preadv2-66161427d627 To: qemu-devel@nongnu.org Cc: Laurent Vivier , Helge Deller , Pierrick Bouvier , Dominique Martinet X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=3559; i=dominique.martinet@atmark-techno.com; h=from:subject:message-id; bh=JV2eQqx6NVRJ5au8EJALAsLiH2qx8yivCf2C06d48M0=; b=owEBbQKS/ZANAwAKAfKKYH/WjHEHAcsmYgBqKRhOSHHLlaFy1AcTTHsA5J6PSxhudbXOhKPbc DeELkdunEyJAjMEAAEKAB0WIQQoFSiLMD+txr0veJbyimB/1oxxBwUCaikYTgAKCRDyimB/1oxx B3mJD/9mK0EhuGUp1NkR26pmZYl+aQN1q0V2TWelsem26Mi8y+z9UXQ9fY8+ZBFQ4PyYmc2j3ED FvJ6Hj5nJ2f0E5uxNjWmOi7tXb+B9G3ywxLFZdfvJHiqex65KcUdHM4ZXrMiTf0AA1mfaAVB1cl XPQmoW6A6dhs3bwiMSg7j10dlsgtej/hKpjdqF7O0uSdOlEKweowMRsG2VUxrxZtvXFo8DjUFsp XATENG8rDJbYGAY9/UoxSeFa1AgGDPq915T8SvimC1iIEsIzGYU3OM5uIGv/OR8hNgtG5dP7QFC ckjsGJD2aHZmzdNfVy2ohe1RFf/tidUAcS5dsMm1Xol0KNCQSEQ4N1yELkVDr/nDGPL4r8w+zu5 MSE/QYJuP8/v5qAvoFy1iamS+rqxBGxKwD3ECAXA0CXc6OkkrPiTLazTCjGTa+x4nA0gjkX84WS iwdmhYZrM/x4y2262IH00/aJRVo2sj6IMrkzjpSlN6xNcUBQc4/FkNoACQpMt8t4/6qlZ0Dtkg1 mThh/H412MVX2ugUeulgfDRpLfgBnA8tTv2DogarUTuCdDZ2z5KxzU6aO3pzUtVs+Vgg81YAKlQ OCmUVYGWsw4EwqmqFCszauKnqli8n841SduN3f74sQsH4TWK/h83LMmVawRdNOonYbngmi/s7LF bkKPaMeUdkpHzjA== X-Developer-Key: i=dominique.martinet@atmark-techno.com; a=openpgp; fpr=2815288B303FADC6BD2F7896F28A607FD68C7107 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=lists1p.gnu.org; Received-SPF: pass client-ip=35.74.137.57; envelope-from=dominique.martinet@atmark-techno.com; helo=gw2.atmark-techno.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, SPF_HELO_PASS=-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: qemu development 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 @atmark-techno.com) X-ZM-MESSAGEID: 1781078157767154100 Some programs apparently use these, like the python test suite. The flags argument (rwf_t) is an int, with values shared on all arches and does not need translating. This was tested manually with the following python script: ``` import os fd =3D os.open('test', os.O_RDWR|os.O_CREAT) os.pwritev(fd, [b'test', b'ok'], 0, os.RWF_HIPRI) buf =3D [bytearray(3), bytearray(10)] os.preadv(fd, buf, 0, os.RWF_HIPRI) print(buf[0]) print(buf[1]) ``` Signed-off-by: Dominique Martinet Reviewed-by: Helge Deller --- (the 80-column checkpatch warning made me wrap a couple of long lines I'd find easier to read with 81 columns, so if you prefer I'd be happy to resend without wrapping for pwrite2 safe_syscall6() declaration and call, but it doesn't matter much either way) Thanks! --- linux-user/syscall.c | 38 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+) diff --git a/linux-user/syscall.c b/linux-user/syscall.c index 7d7a7b489cf93663c24b4e872f509793b7a06683..f1d98857d42dbad54f79f0b1ba5= 887334bae8fa4 100644 --- a/linux-user/syscall.c +++ b/linux-user/syscall.c @@ -741,6 +741,11 @@ safe_syscall5(ssize_t, preadv, int, fd, const struct i= ovec *, iov, int, iovcnt, unsigned long, pos_l, unsigned long, pos_h) safe_syscall5(ssize_t, pwritev, int, fd, const struct iovec *, iov, int, i= ovcnt, unsigned long, pos_l, unsigned long, pos_h) +safe_syscall6(ssize_t, preadv2, int, fd, const struct iovec *, iov, int, i= ovcnt, + unsigned long, pos_l, unsigned long, pos_h, __kernel_rwf_t, = flags) +safe_syscall6(ssize_t, pwritev2, int, fd, const struct iovec *, iov, + int, iovcnt, unsigned long, pos_l, unsigned long, pos_h, + __kernel_rwf_t, flags) safe_syscall3(int, connect, int, fd, const struct sockaddr *, addr, socklen_t, addrlen) safe_syscall6(ssize_t, sendto, int, fd, const void *, buf, size_t, len, @@ -11894,6 +11899,39 @@ static abi_long do_syscall1(CPUArchState *cpu_env,= int num, abi_long arg1, } } return ret; +#endif +#if defined(TARGET_NR_preadv2) + case TARGET_NR_preadv2: + { + struct iovec *vec =3D lock_iovec(VERIFY_WRITE, arg2, arg3, 0); + if (vec !=3D NULL) { + unsigned long low, high; + + target_to_host_low_high(arg4, arg5, &low, &high); + ret =3D get_errno(safe_preadv2(arg1, vec, arg3, low, high,= arg6)); + unlock_iovec(vec, arg2, arg3, 1); + } else { + ret =3D -host_to_target_errno(errno); + } + } + return ret; +#endif +#if defined(TARGET_NR_pwritev2) + case TARGET_NR_pwritev2: + { + struct iovec *vec =3D lock_iovec(VERIFY_READ, arg2, arg3, 1); + if (vec !=3D NULL) { + unsigned long low, high; + + target_to_host_low_high(arg4, arg5, &low, &high); + ret =3D get_errno(safe_pwritev2(arg1, vec, arg3, low, high, + arg6)); + unlock_iovec(vec, arg2, arg3, 0); + } else { + ret =3D -host_to_target_errno(errno); + } + } + return ret; #endif case TARGET_NR_getsid: return get_errno(getsid(arg1)); --- base-commit: de5d8bfd6105d3dd3ae668df9762df244a6d1506 change-id: 20260610-preadv2-66161427d627 Best regards, --=20 Dominique Martinet