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Fri, 3 Apr 2020 13:09:56 +0000 (UTC) Received: from dresden.str.redhat.com (ovpn-113-97.ams2.redhat.com [10.36.113.97]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 2E9F93AF; Fri, 3 Apr 2020 13:09:54 +0000 (UTC) Subject: Re: [PATCH for-5.0] vpc: Don't round up already aligned BAT sizes To: Kevin Wolf References: <20200402093603.2369-1-kwolf@redhat.com> <20200403120400.GC5336@linux.fritz.box> From: Max Reitz Autocrypt: addr=mreitz@redhat.com; prefer-encrypt=mutual; keydata= mQENBFXOJlcBCADEyyhOTsoa/2ujoTRAJj4MKA21dkxxELVj3cuILpLTmtachWj7QW+TVG8U /PsMCFbpwsQR7oEy8eHHZwuGQsNpEtNC2G/L8Yka0BIBzv7dEgrPzIu+W3anZXQW4702+uES U29G8TP/NGfXRRHGlbBIH9KNUnOSUD2vRtpOLXkWsV5CN6vQFYgQfFvmp5ZpPeUe6xNplu8V mcTw8OSEDW/ZnxJc8TekCKZSpdzYoxfzjm7xGmZqB18VFwgJZlIibt1HE0EB4w5GsD7x5ekh awIe3RwoZgZDLQMdOitJ1tUc8aqaxvgA4tz6J6st8D8pS//m1gAoYJWGwwIVj1DjTYLtABEB AAG0HU1heCBSZWl0eiA8bXJlaXR6QHJlZGhhdC5jb20+iQFTBBMBCAA9AhsDBQkSzAMABQsJ CAcCBhUICQoLAgQWAgMBAh4BAheABQJVzie5FRhoa3A6Ly9rZXlzLmdudXBnLm5ldAAKCRD0 B9sAYdXPQDcIB/9uNkbYEex1rHKz3mr12uxYMwLOOFY9fstP5aoVJQ1nWQVB6m2cfKGdcRe1 2/nFaHSNAzT0NnKz2MjhZVmcrpyd2Gp2QyISCfb1FbT82GMtXFj1wiHmPb3CixYmWGQUUh+I AvUqsevLA+WihgBUyaJq/vuDVM1/K9Un+w+Tz5vpeMidlIsTYhcsMhn0L9wlCjoucljvbDy/ 8C9L2DUdgi3XTa0ORKeflUhdL4gucWoAMrKX2nmPjBMKLgU7WLBc8AtV+84b9OWFML6NEyo4 4cP7cM/07VlJK53pqNg5cHtnWwjHcbpGkQvx6RUx6F1My3y52vM24rNUA3+ligVEgPYBuQEN BFXOJlcBCADAmcVUNTWT6yLWQHvxZ0o47KCP8OcLqD+67T0RCe6d0LP8GsWtrJdeDIQk+T+F xO7DolQPS6iQ6Ak2/lJaPX8L0BkEAiMuLCKFU6Bn3lFOkrQeKp3u05wCSV1iKnhg0UPji9V2 W5eNfy8F4ZQHpeGUGy+liGXlxqkeRVhLyevUqfU0WgNqAJpfhHSGpBgihUupmyUg7lfUPeRM DzAN1pIqoFuxnN+BRHdAecpsLcbR8sQddXmDg9BpSKozO/JyBmaS1RlquI8HERQoe6EynJhd 64aICHDfj61rp+/0jTIcevxIIAzW70IadoS/y3DVIkuhncgDBvGbF3aBtjrJVP+5ABEBAAGJ ASUEGAEIAA8FAlXOJlcCGwwFCRLMAwAACgkQ9AfbAGHVz0CbFwf9F/PXxQR9i4N0iipISYjU sxVdjJOM2TMut+ZZcQ6NSMvhZ0ogQxJ+iEQ5OjnIputKvPVd5U7WRh+4lF1lB/NQGrGZQ1ic alkj6ocscQyFwfib+xIe9w8TG1CVGkII7+TbS5pXHRxZH1niaRpoi/hYtgzkuOPp35jJyqT/ /ELbqQTDAWcqtJhzxKLE/ugcOMK520dJDeb6x2xVES+S5LXby0D4juZlvUj+1fwZu+7Io5+B bkhSVPb/QdOVTpnz7zWNyNw+OONo1aBUKkhq2UIByYXgORPFnbfMY7QWHcjpBVw9MgC4tGeF R4bv+1nAMMxKmb5VvQCExr0eFhJUAHAhVg== Message-ID: <7112a410-d081-24e0-fbd2-d8739e6a84df@redhat.com> Date: Fri, 3 Apr 2020 15:09:51 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.6.0 MIME-Version: 1.0 In-Reply-To: <20200403120400.GC5336@linux.fritz.box> X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="Ceg9A4ccInktbq10PDJSOxM4pI9zmxX3G" X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 207.211.31.120 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: qemu-devel@nongnu.org, qemu-block@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --Ceg9A4ccInktbq10PDJSOxM4pI9zmxX3G Content-Type: multipart/mixed; boundary="e6jOGu5SXOGqYLZgbXR7vfRhiCwBT3WnN" --e6jOGu5SXOGqYLZgbXR7vfRhiCwBT3WnN Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 03.04.20 14:04, Kevin Wolf wrote: > Am 03.04.2020 um 10:55 hat Max Reitz geschrieben: >> On 02.04.20 11:36, Kevin Wolf wrote: >>> As reported on Launchpad, Azure apparently doesn't accept images for >>> upload that are not both aligned to 1 MB blocks and have a BAT size tha= t >>> matches the image size exactly. >>> >>> As far as I can tell, there is no real reason why we create a BAT that >>> is one entry longer than necessary for aligned image sizes, so change >>> that. >>> >>> (Even though the condition is only mentioned as "should" in the spec an= d >>> previous products accepted larger BATs - but we'll try to maintain >>> compatibility with as many of Microsoft's ever-changing interpretations >>> of the VHD spec as possible.) >> >> So as far as I can tell we still don=E2=80=99t ensure that the image is = aligned >> to 1 MB blocks? >> >> Well, as long as it=E2=80=99s at least possible for the user to create v= alid >> images, that=E2=80=99s better. >=20 > Yes, we still allow other image sizes because Azure is not the only > product using VHD images, but it is the only one (to my knowledge) that > makes this requirement. >=20 > We're trying to stay compatible with at least three different Microsoft > products (VirtualPC, HyperV, Azure) that all have their own > interpretation of the spec and are inconsistent with each other. OK, nice. Thanks for the explanation! Max --e6jOGu5SXOGqYLZgbXR7vfRhiCwBT3WnN-- --Ceg9A4ccInktbq10PDJSOxM4pI9zmxX3G Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAEBCAAdFiEEkb62CjDbPohX0Rgp9AfbAGHVz0AFAl6HNZ8ACgkQ9AfbAGHV z0Aolgf7BdJ2fKPLWyRMQsL53CwLk4Y8erebCrQBfgjO+4mi+DTqM0N+mQKrHEhr sBVJvRXwrduVSJLAKKx3lj9TrTXj03VY24mvP6h31h/lKQRQphTTg0cwRuDXXd7/ qVJvtIzmIIE+35OSi8It1osjd89LH6BYfTNajwXh4tQz9MUEETsvZULGUMhEJP2N F77FjxCdCV7ex8EXTncRbhnivgwapy8WrkL/+X9lS72tJmhCnX7tfB2CI6lBtlX+ RD+deq3/wCZH5dCd/RNHhuvSpcQTCVp0HhHX2793lue8ey6n1gxQwifJf7O1tKFo VaD+kPTiKCM2XAvmgJsr6NOBECIkiQ== =n1UY -----END PGP SIGNATURE----- --Ceg9A4ccInktbq10PDJSOxM4pI9zmxX3G--