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micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="pF/P2cMhT/UHyHIG" Content-Disposition: inline In-Reply-To: <20241205-vuart-ns8250-v1-0-e9aa923127eb@ford.com> --pF/P2cMhT/UHyHIG Content-Type: text/plain; protected-headers=v1; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Date: Sat, 14 Dec 2024 19:05:15 +0100 From: Marek =?utf-8?Q?Marczykowski-G=C3=B3recki?= To: dmukhin@ford.com Cc: xen-devel@lists.xenproject.org, Andrew Cooper , Jan Beulich , Julien Grall , Stefano Stabellini , Oleksii Kurochko Subject: Re: [PATCH v2 00/35] Introduce NS8250 UART emulator On Thu, Dec 05, 2024 at 08:41:30PM -0800, Denis Mukhin via B4 Relay wrote: > The patch series introduces initial in-hypervisor emulator for > NS8250/NS16x50-compatible UARTs under CONFIG_HAS_VUART_NS8250. >=20 > In parallel domain creation scenario (hyperlaunch), NS8520 emulator helps > early guest OS bringup debugging, because it eliminates dependency on the > external emulator being operational by the time domains are created. Also, > there's no early console facility similar to vpl011 to support x86 guest = OS > bring up. >=20 > The NS8250 emulator is disabled by default. On a high level, why the mechanism used by earlyprintk=3Dxen (IIUC i/o port 0xe9) isn't enough? Hyperlaunch can't start full (Xen-unaware) HVM domains anyway, so a requirement to use a Xen-specific interface for the console shouldn't be an issue, no? --=20 Best Regards, Marek Marczykowski-G=C3=B3recki Invisible Things Lab --pF/P2cMhT/UHyHIG Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAEBCAAdFiEEhrpukzGPukRmQqkK24/THMrX1ywFAmddyNsACgkQ24/THMrX 1yyiBQf/RLMejP9/MPjMcQylP4wOkr9Ltzz5VBvwcCuJfIb3RrdRF20KikVz1YFD Ki3z97Jx3GpRpzDeVBORZvP29DpOlek1GTZuBCoHDBCqRrg3cbbboN0LrAuAGreI disM2GLNckxIv7uLs6FYw3TciOufO/yT1+qN30XQgmrlYzrgRiksDmDVUQztnesi zbAqEn6g4HbhJZNKtus5i49EZXpK7k42AuehxORi33E47anCmmCC3flYUnnSvYYy 5RKATImO/lFeTsXBhJq0P9bO2wdc4Y6I+9czgRMpLXREpBvMq+Pv1V+y5qNZrnxy JN2YbKqqDMvfnlg01rm4bCY+YQrQ7w== =aMUr -----END PGP SIGNATURE----- --pF/P2cMhT/UHyHIG--