[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH] support protected mode mmio with non-zero CS base
On 22/11/06 7:36 am, "Jan Beulich" <jbeulich@xxxxxxxxxx> wrote: >> Remove the "if ( realmode ) " and just use the segment base address. The >> base-address in the register should be correct even in realmod, or the >> processor is broken. [I don't think this code is being executed from >> vmxassist - if it is, then that's a different special case!]. > > I intentionally didn't, as at least on VMX the read operation could > be significantly slower than a shift (and due to the indirect call it will > be slower even on SVM). We'll be using the segment base info everywhere in future, otherwise big real mode does not work. Also, realmode is going to be the uncommon case by far here (and we don't care that much for its performance as long as it doesn't noticeably suck too badly). -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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