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micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="aVpFiCEGh7y89z61" Content-Disposition: inline In-Reply-To: --aVpFiCEGh7y89z61 Content-Type: text/plain; protected-headers=v1; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Date: Wed, 14 Sep 2022 23:57:44 +0200 From: Marek =?utf-8?Q?Marczykowski-G=C3=B3recki?= To: Tamas K Lengyel Cc: Xen-devel Subject: Re: Console output stops on dbgp=xhci On Wed, Sep 14, 2022 at 02:18:34PM -0400, Tamas K Lengyel wrote: > Hi Marek, > I'm testing the latest Xen master git branch > (942ac5fc15ecc2f7ef1d9331c76d89d2cef10e5c) with the now merged xue > patches. My current boot command line includes dbgp=3Dxhci@pci00:14.0 > console=3Ddbgp and this works in that the Xen boot log shows up on the > other side of the debug cable: >=20 > ... >=20 > (XEN) Dom0 has maximum 8 VCPUs >=20 > (XEN) ELF: phdr 0 at 0xffffffff81000000 -> 0xffffffff82c5cdac >=20 > (XEN) ELF: phdr 1 at 0xffffffff82e00000 -> 0xffffffff831a1000 >=20 > (XEN) ELF: phdr 2 at 0xffffffff831a1000 -> 0xffffffff831d5000 >=20 > (XEN) ELF: phdr 3 at 0xffffffff831d5000 -> 0xffffffff84000000 >=20 > However, debug output on the USB3 port stops at this point. I would > expect to see the same as xl dmesg shows: >=20 > (XEN) Dom0 has maximum 8 VCPUs > (XEN) ELF: phdr 0 at 0xffffffff81000000 -> 0xffffffff82c5cdac > (XEN) ELF: phdr 1 at 0xffffffff82e00000 -> 0xffffffff831a1000 > (XEN) ELF: phdr 2 at 0xffffffff831a1000 -> 0xffffffff831d5000 > (XEN) ELF: phdr 3 at 0xffffffff831d5000 -> 0xffffffff84000000 > (XEN) Initial low memory virq threshold set at 0x4000 pages. > (XEN) Scrubbing Free RAM in background > (XEN) Std. Loglevel: All > (XEN) Guest Loglevel: All > (XEN) *** Serial input to DOM0 (type 'CTRL-a' three times to switch input) > (XEN) Freed 2048kB init memory > ... >=20 > Do you have any idea what might be going on and preventing the output > from showing over USB3 afterwards? The /dev/ttyUSB0 device is still > present on the receiving side, just nothing is being received over it. There are few more patches in the series that are de facto required. Especially those about IOMMU, otherwise it can only possibly work with iommu=3D0 (which I'm not sure if even is enough). --=20 Best Regards, Marek Marczykowski-G=C3=B3recki Invisible Things Lab --aVpFiCEGh7y89z61 Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAEBCAAdFiEEhrpukzGPukRmQqkK24/THMrX1ywFAmMiTlgACgkQ24/THMrX 1yzg3wf/cz+gkgHuT38bh2EO5E51EJKMvP0iDXyh4vyMpszXHYPtprrP9ZT6mVY1 TefFFuWxFOp///7iRzwMqRQgaVHe1UhK2ec7LzwbWxuP+U30BWyzM9bgSHtxaHKk 2qZvjcB9gVdBHqpUGRukidWHFVWAPW2zSwd0zojqKUQdftApTG6JqjDz85f0U+/H uh945c4YfDSyj46dMdfqAhZM2dhA1sONsmXjPM5jfe0wHMdP/lQ4hWpVpyxhZpig JSeqcFz5OCZdjArxKrVTKAD+ISANyNhJzR3cnEspCapXll84G8N/vceJdBiQOEj1 ElgfWIBm3sQ1qHC3DyrBgXf1y6Um+g== =TCXG -----END PGP SIGNATURE----- --aVpFiCEGh7y89z61--