[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] Altp2m/#VE page issue
On 06/29/2018 07:52 PM, Tamas K Lengyel wrote: > On Fri, Jun 29, 2018 at 9:25 AM Razvan Cojocaru > <rcojocaru@xxxxxxxxxxxxxxx> wrote: >> >> Hello, >> >> We're trying to get #VE to work with a "regular" guest page (that is, >> not a page that we get via xc_domain_increase_reservation_exact() / >> xc_domain_populate_physmap_exact()). >> >> However, the way Xen's code works now, it doesn't seem to be possible: >> >> http://xenbits.xen.org/gitweb/?p=xen.git;a=blob;f=xen/arch/x86/hvm/vmx/vmx.c;h=20a8a69fbe412aa928c75b5d7756816bf55178fc;hb=refs/heads/staging#l2150 >> >> because get_gfn_query_unlocked() calls ept_get_entry(), which returns >> INVALID_MFN if gfn > p2m->max_mapped_pfn. > > It's certainly weird to have a "regular" gfn that's also above > max_mapped_pfn. That to me sounds like a bug with how max_mapped_pfn > is set. To be honest, I've ran into issues with max_mapped_gfn in the > past too and it was annoying so I do actually end up just running: > > rc = xc_domain_setmaxmem(drakvuf->xen->xc, drakvuf->domID, ~0); > > to make it go away. It's fugly but didn't have time yet to investigate > further ¯\_(ツ)_/¯. Maybe it's time for a proper fix. Those are two problems then, I've just tried that and it doesn't fix mine. I've logged all ept_set_entry()es, and here are the ones before the enable_notify() call: (XEN) [17928.632914] ept_set_entry(): GFN 0x22c8, mfn: 0xb126c8 (XEN) [17928.633175] ept_set_entry(): GFN 0x22ce, mfn: 0xb126ce (XEN) [17928.634519] ept_set_entry(): GFN 0x10687d, mfn: 0xa2807d (XEN) [17928.635939] ept_set_entry(): GFN 0x106745, mfn: 0xa28345 (XEN) [17928.636240] ept_set_entry(): GFN 0x234c, mfn: 0xb1274c (XEN) [17928.636459] ept_set_entry(): GFN 0x1066c2, mfn: 0xa282c2 (XEN) [17928.637163] ept_set_entry(): GFN 0x1066d7, mfn: 0xa282d7 (XEN) [17928.637400] ept_set_entry(): GFN 0x106758, mfn: 0xa28358 (XEN) [17928.639576] ept_set_entry(): GFN 0x1067d9, mfn: 0xa283d9 (XEN) [17928.641908] ept_set_entry(): GFN 0x22b8, mfn: 0xb126b8 (XEN) [17928.642936] ept_set_entry(): GFN 0x2078, mfn: 0xb12878 (XEN) [17928.672682] HVMOP_altp2m_vcpu_enable_notify domain: 5, vcpu: 0, gfn: 0x1c67000 (XEN) [17928.672684] calling altp2m_vcpu_update_vmfunc_ve() (XEN) [17928.672690] gfn > p2m->max_mapped_pfn (goto out) (XEN) [17928.672691] mfn_x(mfn) == INVALID_MFN I'm just trying to set the #VE page to 0x1c67000 on a 4GB domain, and it's less than max_mapped_pfn (at least at the time the application is making the call). Thanks, Razvan _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxxx https://lists.xenproject.org/mailman/listinfo/xen-devel
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