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Re: [RFC PATCH v8 5/5] KVM: arm64: ioctl to fetch/store tags in a guest

From: Steven Price
Subject: Re: [RFC PATCH v8 5/5] KVM: arm64: ioctl to fetch/store tags in a guest
Date: Wed, 10 Feb 2021 16:03:34 +0000
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0

On 08/02/2021 17:31, Peter Maydell wrote:
On Fri, 5 Feb 2021 at 13:58, Steven Price <steven.price@arm.com> wrote:

The VMM may not wish to have it's own mapping of guest memory mapped
with PROT_MTE because this causes problems if the VMM has tag checking
enabled (the guest controls the tags in physical RAM and it's unlikely
the tags are correct for the VMM).

Instead add a new ioctl which allows the VMM to easily read/write the
tags from guest memory, allowing the VMM's mapping to be non-PROT_MTE
while the VMM can still read/write the tags for the purpose of

Signed-off-by: Steven Price <steven.price@arm.com>
  arch/arm64/include/uapi/asm/kvm.h | 13 +++++++
  arch/arm64/kvm/arm.c              | 57 +++++++++++++++++++++++++++++++
  include/uapi/linux/kvm.h          |  1 +
  3 files changed, 71 insertions(+)

Missing the update to the docs in Documentation/virtual/kvm/api.txt :-)

Good point - although I was secretly hoping to get some feedback on the concepts before writing the documentation! But I guess the documentation will help with the review. I'll include some in the next posting.



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