Messages in this thread | | | Subject | Re: [PATCH v5 0/2] MTE support for KVM guest | From | Richard Henderson <> | Date | Wed, 9 Dec 2020 14:13:05 -0600 |
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On 12/9/20 12:39 PM, Catalin Marinas wrote: >> I would have thought that the best way is to use TCO, so that we don't have to >> have dual mappings (and however many MB of extra page tables that might imply). > > The problem appears when the VMM wants to use MTE itself (e.g. linked > against an MTE-aware glibc), toggling TCO is no longer generic enough, > especially when it comes to device emulation.
But we do know exactly when we're manipulating guest memory -- we have special routines for that. So the special routines gain a toggle of TCO around the exact guest memory manipulation, not a blanket disable of MTE across large swaths of QEMU.
r~
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