Messages in this thread | | | Subject | Re: [RFC PATCH v8 5/5] KVM: arm64: ioctl to fetch/store tags in a guest | From | Steven Price <> | Date | Wed, 10 Feb 2021 16:03:34 +0000 |
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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 >> migration. >> >> 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.
Thanks,
Steve
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