Date: Wed, 24 Feb 2010 17:32:13 +0200 From: Kostik Belousov <kostikbel@gmail.com> To: John Baldwin <jhb@freebsd.org> Cc: freebsd-hackers@freebsd.org, Jacques Fourie <jacques.fourie@gmail.com> Subject: Re: VirtualBox and vtophys Message-ID: <20100224153213.GV50403@deviant.kiev.zoral.com.ua> In-Reply-To: <201002240943.20648.jhb@freebsd.org> References: <be2f52431002240341g7eea52f3tc751d59b2a51806@mail.gmail.com> <201002240943.20648.jhb@freebsd.org>
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[-- Attachment #1 --] On Wed, Feb 24, 2010 at 09:43:20AM -0500, John Baldwin wrote: > On Wednesday 24 February 2010 6:41:31 am Jacques Fourie wrote: > > I've noticed that my virtualbox vboxdrv.ko started crashing after > > updating my 8.0-stable install. The crash occurs when vboxdrv calls > > vtophys() on a userland virtual address. Prior to r202894 this was > > working fine. Modifying pmap_kextract() to use vtopte() for non-kernel > > virtual adresses fixes the problem. Is it intended for vtophys() to > > still work on userland virtual addresses? > > Use pmap_extract(pmap, ...) for user addresses. Granted, that is only > reliable if the user pages have been wired in some fashion. The reference code is in sys/dev/cxgb/ulp/tom/cxgb_vm.c:vm_fault_hold_user_pages(), it holds and returns the page that was mapped at the moment of the call at the specified address. [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (FreeBSD) iEYEARECAAYFAkuFRn0ACgkQC3+MBN1Mb4i3cwCaAgF2YabOhA6lf52wBRWxhq/q ytsAniAED5NSA0BOrK2A4OMYMBDlR3D6 =Ngfp -----END PGP SIGNATURE-----help
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