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Re: [PATCH v5 0/2] MTE support for KVM guest
From: |
Richard Henderson |
Subject: |
Re: [PATCH v5 0/2] MTE support for KVM guest |
Date: |
Wed, 9 Dec 2020 14:13:05 -0600 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 |
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~
- Re: [PATCH v5 0/2] MTE support for KVM guest, (continued)
- Re: [PATCH v5 0/2] MTE support for KVM guest, Marc Zyngier, 2020/12/07
- Re: [PATCH v5 0/2] MTE support for KVM guest, Catalin Marinas, 2020/12/07
- Re: [PATCH v5 0/2] MTE support for KVM guest, Marc Zyngier, 2020/12/07
- Re: [PATCH v5 0/2] MTE support for KVM guest, Catalin Marinas, 2020/12/08
- Re: [PATCH v5 0/2] MTE support for KVM guest, Marc Zyngier, 2020/12/08
- Re: [PATCH v5 0/2] MTE support for KVM guest, Catalin Marinas, 2020/12/09
- Re: [PATCH v5 0/2] MTE support for KVM guest, Marc Zyngier, 2020/12/09
- Re: [PATCH v5 0/2] MTE support for KVM guest, Catalin Marinas, 2020/12/09
- Re: [PATCH v5 0/2] MTE support for KVM guest, Richard Henderson, 2020/12/09
- Re: [PATCH v5 0/2] MTE support for KVM guest, Catalin Marinas, 2020/12/09
- Re: [PATCH v5 0/2] MTE support for KVM guest,
Richard Henderson <=
- Re: [PATCH v5 0/2] MTE support for KVM guest, Peter Maydell, 2020/12/09
- Re: [PATCH v5 0/2] MTE support for KVM guest, Dr. David Alan Gilbert, 2020/12/07
- Re: [PATCH v5 0/2] MTE support for KVM guest, Peter Maydell, 2020/12/07
- Re: [PATCH v5 0/2] MTE support for KVM guest, Dr. David Alan Gilbert, 2020/12/07
- Re: [PATCH v5 0/2] MTE support for KVM guest, Haibo Xu, 2020/12/08
Re: [PATCH v5 0/2] MTE support for KVM guest, Haibo Xu, 2020/12/08
Re: [PATCH v5 0/2] MTE support for KVM guest, Haibo Xu, 2020/12/16