[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] Limitation in HVM physmap
On Fri, 2013-10-18 at 16:07 +0100, Wei Liu wrote: > On Fri, Oct 18, 2013 at 04:04:17PM +0100, Wei Liu wrote: > > On Fri, Oct 18, 2013 at 03:59:10PM +0100, Ian Campbell wrote: > > [...] > > > > > > > > > > > > > During OVMF initialization: > > > > > > > > (d28) PciBus: Resource Map for Root Bridge PciRoot(0x0) > > > > > > > > (d28) Type = Io16; Base = 0xC000; Length = 0x1000; > > > > Alignment = 0xFFF > > > > (d28) Base = 0xC000; Length = 0x100; Alignment = 0xFF; Owner = > > > > PCI [00|04| > > > > (d28) Base = 0xC100; Length = 0x100; Alignment = 0xFF; Owner = > > > > PCI [00|03| > > > > (d28) Base = 0xC200; Length = 0x10; Alignment = 0xF; Owner = > > > > PCI [00|01| > > > > (d28) Type = Mem32; Base = 0x80000000; Length = 0x3100000; > > > > Alignment = 0x1FFFFF > > > > (d28) Base = 0x80000000; Length = 0x2000000; Alignment = > > > > 0x1FFFFFF; Owne > > > > (d28) |02|00:10] > > > > > > > > Later when Linux loads EFIFB driver: > > > > [ 2.628264] efifb: framebuffer at 0x80000000, mapped to > > > > 0xffffc90000100000, using 1876k, total 1875k > > > > [ 2.646827] efifb: mode is 800x600x32, linelength=3200, pages=1 > > > > [ 2.658833] efifb: scrolling: redraw > > > > [ 2.666342] efifb: Truecolor: size=8:8:8:8, shift=24:16:8:0 > > > > > > > > 0xf0000000 is mapped by: > > > > > > What hardware is backing the framebuffer at 0x80000000? It doesn't > > > appear to be this cirrus device. > > > > > > > Looking that the "Resource Map for Root Bridge" 0x8000000 is backed by > > 00:02:00 (trancated above) and 00:02.0 is also owned by Cirrus Logic > > driver... > > > > > Does this VM have two graphics cards and therefore two drivers (efifb > > > and cirrusfb/vesafb/etc)? > > > > > > If there are two gfx cards then there should be two framebuffers and > > > therefore no mfn sharing in the p2m, although you would probably be > > > better off arranging for their to only one gfx card... > > > > > > > AIUI there is only one card. > > > > FWIW there's a QEMU Cirrus Logic card driver in OVMF which drives the > emulated card. So is the bug that both OVMF and Linux are trying to drive the card? They can't both do it, unless OVMF is even more magic than I thought... Ian. _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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