[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH] passthru: Fix pci bar remapping for passthru devices
Are you questioning whether this patch should be applied? -- Keir On 20/07/2009 15:26, "Jiang, Yunhong" <yunhong.jiang@xxxxxxxxx> wrote: > I assume guest should disable the MMIO in PCI_COMMAND before writing all "1"s > to bar register. Otherwise, what will happen on native if guest try to access > 0xFFFFFFF0? > And if we do update the P2M, will it cause trouble to Xen HV? > > Thanks > Yunhong Jiang > > xen-devel-bounces@xxxxxxxxxxxxxxxxxxx wrote: >> Hi, >> When guest code tries to get the block size of mmio, it will write >> all "1"s into pci bar register and then qemu will return all "0"s to >> the don't care >> bits in the emulated bar register to indicate the block size >> to guest code. >> In this case, we should not create p2m mapping in >> pt_bar_reg_write() and >> pt_exp_rom_bar_reg_write(). Attached patch fixes this issue, >> additional comment can be found in the patch. >> >> Thanks, >> Wei >> >> Signed-off-by: Wei Wang <wei.wang2@xxxxxxx> >> -- >> AMD GmbH, Germany >> Operating System Research Center >> >> Legal Information: >> Advanced Micro Devices GmbH >> Karl-Hammerschmidt-Str. 34 >> 85609 Dornach b. München >> >> Geschäftsführer: Jochen Polster, Thomas M. McCoy, Giuliano Meroni >> Sitz: Dornach, Gemeinde Aschheim, Landkreis München >> Registergericht München, HRB Nr. 43632 > _______________________________________________ > Xen-devel mailing list > Xen-devel@xxxxxxxxxxxxxxxxxxx > http://lists.xensource.com/xen-devel _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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