| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Date: Thu, 23 Jun 2011 16:38:54 +0100 From: David Woodhouse <dwmw2@...radead.org> To: Joerg Roedel <joerg.roedel@....com> Cc: iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org, Ohad Ben-Cohen <ohad@...ery.com>, David Brown <davidb@...eaurora.org>, kvm@...r.kernel.org, Avi Kivity <avi@...hat.com>, Alex Williamson <alex.williamson@...hat.com> Subject: Re: [PATCH 0/2] Introduce iommu_commit() function On Thu, 2011-06-23 at 17:31 +0200, Joerg Roedel wrote: > David, I think especially VT-d can benefit from such a callback. I will > implement support for it in the AMD IOMMU driver and post a patch-set > soon. > > Any comments, thoughts? Ick. We *already* do the flushes as appropriate while we're filling the page tables. So every time we move on from one page table page to the next, we'll flush the old one. And when we've *done* filling the page tables for the range we've been asked to map, we flush the last writes too. The problem with KVM is that it calls us over and over again to map a single 4KiB page. It doesn't seem simple to make use of a 'commit' function, because we'd have to keep track of *which* page tables are dirty. I'd much rather KVM just gave us a list of the pages to map, in a single call. Or even a 'translation' callback we could call to get the physical address for each page in the range. -- dwmw2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists