[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH] Register PV driver product numbers 4 and 5.
Wednesday, October 9, 2013, 12:19:38 PM, you wrote: >> -----Original Message----- >> From: Sander Eikelenboom [mailto:linux@xxxxxxxxxxxxxx] >> Sent: 09 October 2013 10:10 >> To: Ian Campbell >> Cc: Paul Durrant; xen-devel@xxxxxxxxxxxxx >> Subject: Re: [Xen-devel] [PATCH] Register PV driver product numbers 4 and >> 5. >> >> >> Wednesday, October 9, 2013, 10:00:53 AM, you wrote: >> >> > On Tue, 2013-10-08 at 15:53 +0100, Paul Durrant wrote: >> >> >> > It's a bit confusing, I agree. Referring back to previous threads >> >> > though, >> all >> >> > HVM systems are assumed to have the xen platform PCI device (as >> there is >> >> > no way to turn it off if youâre using machine type xenfv), thus the >> >> > fixed >> IO >> >> > ports that implement the blacklisting protocol are assumed to always be >> >> > present. Because the ports are fixed and always present the PV drivers >> don't >> >> > have to care which device they are binding to - they talk to the same IO >> ports >> >> > regardless. >> >> Paul, >> >> Do you by any chance know the commit that made this unconditional ? >> (it used to be possible to switch it off with xen_platform_pci=0, and i'm >> trying >> to see >> if the platform device and the hidden NIC (pci 00:03.0 not visible in guest >> lspci >> but it's there >> (xl dmesg reports it begin generate and there is a gap in the device number >> (platform 00:02.0 passthroughed device 00:04.0) has something to do with it. >> > Sander, > It wasn't a commit that did this as such, it's just that no-one added the > option to turn it off in upstream QEMU. I believe you can still turn it off > if you're using trad QEMU. Hrmmm it seems the unplug of disk and nic is also unconditional then ? Regardless if the guest os has the PV drivers ? (using a recent guest kernel without xen pv drivers can't find it's disk and thus boot device ?) > >> The rom bar of my passthroughed device some how gets wired at first to the >> vga bios of the cirrus vga or stdvga. >> When i disable the emulated vga (-nographic and -vga none) it is suddenly >> wired to the ixpe rom (of device 00:03.0). >> >> So there is something funky going on in either hvmloader, seabios and/or >> qemu. > Yes, that sounds very funky. Yips, any reason why the PV nic is unvisible for lspci ? > Paul >> But it would be nice to rule out as much as possible. >> >> -- >> Sander >> >> > That makes sense I suppose. >> >> > Can we add some words about this relationship to the docs then? >> >> >> Ping? Do I need to add any further clarification? >> >> > I thought I'd already replied but I don't see it anywhere on the list or >> > in my sent box, sorry. >> >> > Ian/ >> >> >> _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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