Messages in this thread | | | Date | Thu, 16 Apr 2020 16:26:05 +0100 | From | Marc Zyngier <> | Subject | Re: [PATCH 8/8] arm64: cpufeature: Add an overview comment for the cpufeature framework |
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On 2020-04-16 15:59, Suzuki K Poulose wrote:
Hi Suzuki,
[...]
> As you mentioned in the other response we could add information about > the guest view, something like : > > - KVM exposes the sanitised value of the feature registers to the > guests and is not affected by the FTR_VISIBLE. However, > depending on the individual feature support in the hypervisor, > some of the fields may be capped/limited.
Although in most cases, what KVM exposes is indeed a strict subset of the host's features, there is a few corner cases where we expose features that do not necessarily exist on the host. For example ARMv8.5-GTG and ARMv8.4-TTL get exposed by the NV patches even if they don't exist on the host, as KVM will actually emulate them.
Not a big deal, but I just wanted to outline that it isn't as clear-cut as it may seem...
Thanks,
M. -- Jazz is not dead. It just smells funny...
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