From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 68197C25B67 for ; Fri, 27 Oct 2023 12:03:58 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qwLYW-0001FY-Ap; Fri, 27 Oct 2023 08:03:12 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qwLYP-0001Eh-Ow; Fri, 27 Oct 2023 08:03:05 -0400 Received: from casper.infradead.org ([2001:8b0:10b:1236::1]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qwLYG-0002cG-FJ; Fri, 27 Oct 2023 08:03:04 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=xbyOrQ9050h9MAoHON7t0yBFDvlRtikljfzvgpDlS5Q=; b=p+g4Ef6ShSjHTgCd2R9gQAyDRQ JQvbiCt5jRM9oiI9mj42/ecATMUQnKbnY22xn+4EqIIt62sscqJWQhUJ/+yDvB/NeJoNEG7PZ7d0o QfRwS9hT0Zuv20ex9C2a7TZIZNmPvjWqGFTjzF3VHVQArBgJYuuuFkFSUFSE7tab5IViq3ME0jIqc O63DeZXRCnJiUcMEnN6r9N80+U/snK/fnlTE1hCaOSwgDo0TGNXxKw8KwwXyH8tkJxM9hzinF/5D1 eB8cOk1QzGbWQ4pAmiSegyR411z/LTRYTeR72mzaiVLL2WrJdLKF91zQyDL99ddRNd5vDMEfub8Mp vwxwvaow==; Received: from [2001:8b0:10b:5:a059:f7a9:933a:2236] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1qwLY8-003HdW-Af; Fri, 27 Oct 2023 12:02:48 +0000 Message-ID: <31acd48a13b3e198a025da1add7d8f7253f262ba.camel@infradead.org> Subject: Re: [PATCH v3 13/28] hw/xen: automatically assign device index to block devices From: David Woodhouse To: paul@xen.org, qemu-devel@nongnu.org Cc: Kevin Wolf , Hanna Reitz , Stefano Stabellini , Anthony Perard , =?ISO-8859-1?Q?Marc-Andr=E9?= Lureau , Paolo Bonzini , "Michael S. Tsirkin" , Marcel Apfelbaum , Richard Henderson , Eduardo Habkost , Jason Wang , Marcelo Tosatti , qemu-block@nongnu.org, xen-devel@lists.xenproject.org, kvm@vger.kernel.org, Bernhard Beschow , Joel Upham Date: Fri, 27 Oct 2023 13:02:45 +0100 In-Reply-To: References: <20231025145042.627381-1-dwmw2@infradead.org> <20231025145042.627381-14-dwmw2@infradead.org> <74e54da5-9c35-485d-a13c-efac3f81dec2@gmail.com> <9fb67e52-f262-4cf4-91c2-a42411ba21c4@gmail.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-x8BOGq/ESRm/cDp9nNRD" User-Agent: Evolution 3.44.4-0ubuntu2 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Received-SPF: none client-ip=2001:8b0:10b:1236::1; envelope-from=BATV+92d2995e4a7c3d3365be+7369+infradead.org+dwmw2@casper.srs.infradead.org; helo=casper.infradead.org X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 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_MED=-2.3, SPF_HELO_NONE=0.001, SPF_NONE=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+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org --=-x8BOGq/ESRm/cDp9nNRD Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2023-10-27 at 11:32 +0100, Durrant, Paul wrote: > On 27/10/2023 11:25, David Woodhouse wrote: > > On Fri, 2023-10-27 at 10:01 +0100, Durrant, Paul wrote: > > >=20 > > > This code is allocating a name automatically so I think the onus is o= n > > > it not create a needless clash which is likely to have unpredictable > > > results depending on what the guest is. Just avoid any aliasing in th= e > > > first place and things will be fine. > >=20 > >=20 > > Yeah, fair enough. In which case I'll probably switch to using > > xs_directory() and then processing those results to find a free slot, > > instead of going out to XenStore for every existence check. > >=20 > > This isn't exactly fast path and I'm prepared to tolerate a little bit > > of O(n=C2=B2), but only within reason :) >=20 > Yes, doing an xs_directory() and then using the code=20 > xen_block_get_vdev() to populate a list of existent disks will be neater. diff --git a/hw/block/xen-block.c b/hw/block/xen-block.c index 5011fe9430..9b7d7ef7e1 100644 --- a/hw/block/xen-block.c +++ b/hw/block/xen-block.c @@ -30,48 +30,105 @@ #include "hw/xen/interface/io/xs_wire.h" #include "trace.h" =20 -static char *xen_block_get_name(XenDevice *xendev, Error **errp) +#define XVDA_MAJOR 202 +#define XVDQ_MAJOR (1<<20) +#define XVDBGQCV_MAJOR ((1<<21) - 1) +#define HDA_MAJOR 3 +#define HDC_MAJOR 22 +#define SDA_MAJOR 8 + +/* + * This is fairly arbitrary just to avoid a stupidly sized bitmap, but Lin= ux + * as of v6.6 only supports up to /dev/xvdfan (disk 4095) anyway. + */ +#define MAX_AUTO_VDEV 4096 + +static int vdev_to_diskno(unsigned int vdev_nr) { - XenBlockDevice *blockdev =3D XEN_BLOCK_DEVICE(xendev); + switch (vdev_nr >> 8) { + case XVDA_MAJOR: + case SDA_MAJOR: + return (vdev_nr >> 4) & 0x15; + + case HDA_MAJOR: + return (vdev_nr >> 6) & 1; + + case HDC_MAJOR: + return ((vdev_nr >> 6) & 1) + 2; + + case XVDQ_MAJOR ... XVDBGQCV_MAJOR: + return (vdev_nr >> 8) & 0xfffff; + + default: + return -1; + } +} + +static bool xen_block_find_free_vdev(XenBlockDevice *blockdev, Error **err= p) +{ + XenBus *xenbus =3D XEN_BUS(qdev_get_parent_bus(DEVICE(blockdev))); + unsigned long used_devs[BITS_TO_LONGS(MAX_AUTO_VDEV)]; XenBlockVdev *vdev =3D &blockdev->props.vdev; + char fe_path[XENSTORE_ABS_PATH_MAX + 1]; + char **existing_frontends; + unsigned int nr_existing =3D 0; + unsigned int vdev_nr; + int i, disk =3D 0; + + snprintf(fe_path, sizeof(fe_path), "/local/domain/%u/device/vbd", + blockdev->xendev.frontend_id); + + existing_frontends =3D qemu_xen_xs_directory(xenbus->xsh, XBT_NULL, fe= _path, + &nr_existing); + if (!existing_frontends && errno !=3D ENOENT) { + error_setg_errno(errp, errno, "cannot read %s", fe_path); + return false; + } =20 - if (blockdev->props.vdev.type =3D=3D XEN_BLOCK_VDEV_TYPE_INVALID) { - XenBus *xenbus =3D XEN_BUS(qdev_get_parent_bus(DEVICE(xendev))); - char fe_path[XENSTORE_ABS_PATH_MAX + 1]; - char *value; - int disk =3D 0; - unsigned long idx; - - /* Find an unoccupied device name */ - while (disk < (1 << 20)) { - if (disk < (1 << 4)) { - idx =3D (202 << 8) | (disk << 4); - } else { - idx =3D (1 << 28) | (disk << 8); - } - snprintf(fe_path, sizeof(fe_path), - "/local/domain/%u/device/vbd/%lu", - xendev->frontend_id, idx); - value =3D qemu_xen_xs_read(xenbus->xsh, XBT_NULL, fe_path, NUL= L); - if (!value) { - if (errno =3D=3D ENOENT) { - vdev->type =3D XEN_BLOCK_VDEV_TYPE_XVD; - vdev->partition =3D 0; - vdev->disk =3D disk; - vdev->number =3D idx; - goto found; - } - error_setg(errp, "cannot read %s: %s", fe_path, - strerror(errno)); - return NULL; - } - free(value); - disk++; + memset(used_devs, 0, sizeof(used_devs)); + for (i =3D 0; i < nr_existing; i++) { + if (qemu_strtoui(existing_frontends[i], NULL, 10, &vdev_nr)) { + free(existing_frontends[i]); + continue; } + + free(existing_frontends[i]); + + disk =3D vdev_to_diskno(vdev_nr); + if (disk < 0 || disk >=3D MAX_AUTO_VDEV) { + continue; + } + + set_bit(disk, used_devs); + } + free(existing_frontends); + + disk =3D find_first_zero_bit(used_devs, MAX_AUTO_VDEV); + if (disk =3D=3D MAX_AUTO_VDEV) { error_setg(errp, "cannot find device vdev for block device"); + return false; + } + + vdev->type =3D XEN_BLOCK_VDEV_TYPE_XVD; + vdev->partition =3D 0; + vdev->disk =3D disk; + if (disk < (1 << 4)) { + vdev->number =3D (XVDA_MAJOR << 8) | (disk << 4); + } else { + vdev->number =3D (XVDQ_MAJOR << 8) | (disk << 8); + } + return true; +} + +static char *xen_block_get_name(XenDevice *xendev, Error **errp) +{ + XenBlockDevice *blockdev =3D XEN_BLOCK_DEVICE(xendev); + XenBlockVdev *vdev =3D &blockdev->props.vdev; + + if (vdev->type =3D=3D XEN_BLOCK_VDEV_TYPE_INVALID && + !xen_block_find_free_vdev(blockdev, errp)) { return NULL; } - found: return g_strdup_printf("%lu", vdev->number); } =20 @@ -520,10 +577,10 @@ static void xen_block_set_vdev(Object *obj, Visitor *= v, const char *name, case XEN_BLOCK_VDEV_TYPE_DP: case XEN_BLOCK_VDEV_TYPE_XVD: if (vdev->disk < (1 << 4) && vdev->partition < (1 << 4)) { - vdev->number =3D (202 << 8) | (vdev->disk << 4) | + vdev->number =3D (XVDA_MAJOR << 8) | (vdev->disk << 4) | vdev->partition; } else if (vdev->disk < (1 << 20) && vdev->partition < (1 << 8)) { - vdev->number =3D (1 << 28) | (vdev->disk << 8) | + vdev->number =3D (XVDQ_MAJOR << 8) | (vdev->disk << 8) | vdev->partition; } else { goto invalid; @@ -533,10 +590,10 @@ static void xen_block_set_vdev(Object *obj, Visitor *= v, const char *name, case XEN_BLOCK_VDEV_TYPE_HD: if ((vdev->disk =3D=3D 0 || vdev->disk =3D=3D 1) && vdev->partition < (1 << 6)) { - vdev->number =3D (3 << 8) | (vdev->disk << 6) | vdev->partitio= n; + vdev->number =3D (HDA_MAJOR << 8) | (vdev->disk << 6) | vdev->= partition; } else if ((vdev->disk =3D=3D 2 || vdev->disk =3D=3D 3) && vdev->partition < (1 << 6)) { - vdev->number =3D (22 << 8) | ((vdev->disk - 2) << 6) | + vdev->number =3D (HDC_MAJOR << 8) | ((vdev->disk - 2) << 6) | vdev->partition; } else { goto invalid; @@ -545,7 +602,7 @@ static void xen_block_set_vdev(Object *obj, Visitor *v,= const char *name, =20 case XEN_BLOCK_VDEV_TYPE_SD: if (vdev->disk < (1 << 4) && vdev->partition < (1 << 4)) { - vdev->number =3D (8 << 8) | (vdev->disk << 4) | vdev->partitio= n; + vdev->number =3D (SDA_MAJOR << 8) | (vdev->disk << 4) | vdev->= partition; } else { goto invalid; } --=-x8BOGq/ESRm/cDp9nNRD Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEkQw ggYQMIID+KADAgECAhBNlCwQ1DvglAnFgS06KwZPMA0GCSqGSIb3DQEBDAUAMIGIMQswCQYDVQQG EwJVUzETMBEGA1UECBMKTmV3IEplcnNleTEUMBIGA1UEBxMLSmVyc2V5IENpdHkxHjAcBgNVBAoT FVRoZSBVU0VSVFJVU1QgTmV0d29yazEuMCwGA1UEAxMlVVNFUlRydXN0IFJTQSBDZXJ0aWZpY2F0 aW9uIEF1dGhvcml0eTAeFw0xODExMDIwMDAwMDBaFw0zMDEyMzEyMzU5NTlaMIGWMQswCQYDVQQG 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