[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] The memory type of non-RAM address is WB by default?
In changeset 17471:cd5dc735bdf3(x86, hvm: Lots of MTRR/PAT emulation cleanup), the default memory type is set to WB and the type of each special memory range is set properly. Specially, [3.75G, 4G) is assumed as PCI space and marked as UC. I meet with an issue: When I "xm pci-attach" a NIC into RHEL5.1 Linux guest(memory=256M), the virtual MMIO BAR assigned by guest starts from 0x20000000 and I don't find guest kernel tries to set the MTRR registers at all; as a result, the type of the pfn is WB, but in hypervisor, the host mfn is UC, so when guest accesses the vBAR, there are many lines of such warnings printed: (XEN) mtrr.c:400:d10 Conflict occurs for a given guest l1e flags:163 at 20000000 (the effective mm type:6), because the host mtrr type is:0 Here I think the device should work normally since the actual host mfn is UC, but we might as well fix such inconsistency. Can't we set the default type to UC? BTW: when I statically assign a NIC to guest via config file, since the vBAR assigned by hvmloader starts from 0xF0000000, I don't see the warnings. Thanks, -- Dexuan _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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