[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] mark pages in p2m_ram_paging_out state read-only
At 17:53 +0100 on 14 Nov (1321293182), Olaf Hering wrote: > > I was wondering why ept_p2m_type_to_flags() removes all permissions from > a gfn in state p2m_ram_paging_out. If the guest happens to read or > execute from that page while the pager writes that gfn to disk, wouldnt > it be enough to remove the write bit to prevent writes from the guest? > If the page is read-only the guest could continue to make progress until > the gfn is really evicted and the p2mt changes to p2m_ram_paged. > > I havent actually tried the patch below, but is there any reason it > would break the guest? As long as we change the p2m type before scrubbing or freeing the page, that seems like it shuold be fine. Tim. _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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