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Tue, 13 Aug 2019 19:35:08 +0000 (UTC) To: Sam Eiderman , kwolf@redhat.com, qemu-block@nongnu.org, qemu-devel@nongnu.org, seabios@seabios.org, kraxel@redhat.com, kevin@koconnor.net References: <20190626123948.10199-1-shmuel.eiderman@oracle.com> From: Max Reitz Openpgp: preference=signencrypt 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: <3f9009fc-b478-60e1-dbcd-7782336c26e7@redhat.com> Date: Tue, 13 Aug 2019 21:35:06 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: <20190626123948.10199-1-shmuel.eiderman@oracle.com> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="DWer4nmGtEkLkR3j0GQdckceGUPm6geVF" X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.28]); Tue, 13 Aug 2019 19:35:14 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: Re: [Qemu-devel] [QEMU] [PATCH v5 0/8] Add Qemu to SeaBIOS LCHS interface 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: liran.alon@oracle.com, karl.heubaum@oracle.com, arbel.moshe@oracle.com 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) --DWer4nmGtEkLkR3j0GQdckceGUPm6geVF Content-Type: multipart/mixed; boundary="WEOWzJqS9ZRtmag05GohvfXNlQq8eNIx4"; protected-headers="v1" From: Max Reitz To: Sam Eiderman , kwolf@redhat.com, qemu-block@nongnu.org, qemu-devel@nongnu.org, seabios@seabios.org, kraxel@redhat.com, kevin@koconnor.net Cc: karl.heubaum@oracle.com, liran.alon@oracle.com, arbel.moshe@oracle.com Message-ID: <3f9009fc-b478-60e1-dbcd-7782336c26e7@redhat.com> Subject: Re: [QEMU] [PATCH v5 0/8] Add Qemu to SeaBIOS LCHS interface References: <20190626123948.10199-1-shmuel.eiderman@oracle.com> In-Reply-To: <20190626123948.10199-1-shmuel.eiderman@oracle.com> --WEOWzJqS9ZRtmag05GohvfXNlQq8eNIx4 Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 26.06.19 14:39, Sam Eiderman wrote: > v1: >=20 > Non-standard logical geometries break under QEMU. >=20 > A virtual disk which contains an operating system which depends on > logical geometries (consistent values being reported from BIOS INT13 > AH=3D08) will most likely break under QEMU/SeaBIOS if it has non-standa= rd > logical geometries - for example 56 SPT (sectors per track). > No matter what QEMU will guess - SeaBIOS, for large enough disks - will= > use LBA translation, which will report 63 SPT instead. >=20 > In addition we can not enforce SeaBIOS to rely on phyiscal geometries a= t > all. A virtio-blk-pci virtual disk with 255 phyiscal heads can not > report more than 16 physical heads when moved to an IDE controller, the= > ATA spec allows a maximum of 16 heads - this is an artifact of > virtualization. >=20 > By supplying the logical geometies directly we are able to support such= > "exotic" disks. >=20 > We will use fw_cfg to do just that. (From a block perspective,) I didn=E2=80=99t find anything too bad, so: Acked-by: Max Reitz --WEOWzJqS9ZRtmag05GohvfXNlQq8eNIx4-- --DWer4nmGtEkLkR3j0GQdckceGUPm6geVF Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAEBCAAdFiEEkb62CjDbPohX0Rgp9AfbAGHVz0AFAl1TEOoACgkQ9AfbAGHV z0De0wgAlf8VnM17uoVg8wA/DUSLOLjTEw/blK7v1+rQbmu9PmeG/smqmGwxJkCU b/fqeDUb6EBgj19O3CGaq6AjPo276PvjXE8itOuK5dR6WeJDHU/rQLcX6LVlSdJx Ax7dy/BHJUaG0iqZ+LuHQ3vWMcGR/7EPBlCTF40l9Pq5yoWROZcmDMY+MnCpE71t PSwm1BYDWwQBRyTwSyrB9FInpGBxG85lsFCHjj25eu/8O5wUJAXKyHNLSFwRUPyr HWPwAbu1iejWKCjM5llWJaMD3JJQEJ/lu9ED9H/f29I5mqzikdhPMKn/errBXGFe 6dJdg7kP4+a8N6STCrLbQkDIo2LJBQ== =IgXi -----END PGP SIGNATURE----- --DWer4nmGtEkLkR3j0GQdckceGUPm6geVF--