[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH 0/2] MTRR/PAT virtualization
The second patch is a bit of a hack-and-slash job. New memory-type virtualisation code should go in a new file, instead of being put in host MTRR management files (which are mostly unmodified from Linux anyway, and shouldn't deviate more than necessary). There are various other one-line changes in various MTRR source files that are unexplained (e.g., mask changes from |0xf00 to |0x7ff). Initialisation of guest MTRR state will need to be moved to hvmloader -- we do not call setvcpucontext for HVM guests any more, so the current hack won't work with current xen-unstable. Coding style needs cleaning up (looks like there is some spaces vs. tabs mixing up going on). -- Keir On 8/10/07 08:34, "Su, Disheng" <disheng.su@xxxxxxxxx> wrote: > Hi, > The following 2 patches add basic MTRR/PAT support into > hypervisor. When vt-d enabled, direct IO and RAM > could be mapped to different cache attribute, such as UC or WC, which > will bring some trouble. > xen.patch: some data structures of MTRR in xen are exported. > mtrr_pat.patch: The basic idea is listed below: > a. MTRR/PAT MSRs are per vcpu. The value of guest MTRR is > initialized in host, after guest E820 table is build. The value of guest > PAT is initialized as default. The host PAT is initialized to cover all > the page attributes. > b. The guest page attribute is virtualized through shadow page > attribute. First, get the effective guest page attribute, by calculating > from the combination of guest MTRR/PAT. Then the shadow page attribute > is calculated from effective guest page attribute and host MTRR. If > conflict occurs(e.g effective guest page attribute is WB, host MTRR of > this range is UC, can't set this page attribute as guest required), set > this range as UC. Some lookup tables are added to accelerate above > procedure. > > Signed-off-by: Disheng Su <disheng.su@xxxxxxxxx> > > Best Regards, > Disheng, Su > > _______________________________________________ > 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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