[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] Identifying pagetype in they hypervisor
Thanks Mark. That's what I think I'm looking for. I think I've managed to confuse myself a bit again (haven't touched the modifications I made to the shadow code in a while) with the gmfn/mfn naming in the shadow code. In _sh_propagate(..., target_fmn,..) and _sh_mark_dirty(..., gmfn), I'm assuming that a real machine frame number is passed to those functions, not a pseudo-physical one... am I correct? Basically, I need to be sure that when the sh_page_fault_handler() eventually calls _sh_propagate(), it passes the machine frame number of the faulting page, not the HVM guest's perceived physical address (gmfn/pseudo-physical). Thanks, Mike On Sun, Aug 24, 2008 at 9:10 PM, Mark Williamson <mark.williamson@xxxxxxxxxxxx> wrote: > I'm looking at the latest code but I would think the same code applies. > > Maybe you could try mfn_to_page() to get the struct page_info * and then poke > about in that for the current type? In order to make this useful you'd > probably have to do a get_page or similar to avoid races with other CPUs. > > Cheers, > Mark > > On Monday 25 August 2008 01:47:19 Mike Sun wrote: >> Hi -- >> >> I'm working off of a bit older branch, 3.1.0, but hopefully the >> question is still relevant. >> >> In the suspend/restore code in 'tools/libxc/xc_domain_save.c', as part >> of the saved record, a list of pfn_types are saved prior to the actual >> pages themselves. These pfn_types are pfns with a type bits >> associated with them that are accessed with the XEN_DOMCTL_PFINFO_XTAB >> bitmask. >> >> I'm doing some copy-on-write work, and when I intercept writes in the >> hypervisor, I need to copy both the actual page, and the type >> associated with the page (so that it could later be properly written >> out to the save record). I've modified the shadow page table code to >> handle write faults associated with CoW and am able to get the mfn of >> the faulting page and perform the copy; I cannot seem to find where >> given the mfn, I can find the page type associated with it. Could >> anybody help point me to the right place or direction? >> >> Much thanks, >> Mike >> >> _______________________________________________ >> 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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