On Wed, Oct 20, 2021, Li Yu wrote:

Warn for guest huge pages split if iTLB multi-hit bug is present
and CPU mitigations is enabled.

Warn for possible CPU lockup if iTLB multi-hit bug is present but
CPU mitigations is disabled.

Signed-off-by: Li Yu <redacted>
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Gah, my last reply in the previous version was offlist.  I would like an answer
to the below question before we complicate KVM just to log a message.

On Wed, Oct 20, 2021 at 12:51 PM Sean Christopherson [off-list ref] wrote:

On Wed, Oct 20, 2021, Li Yu wrote:

quoted

On 2021/10/20 00:23, Sean Christopherson wrote:
I think it is necessary to log something when `nx_huge_pages` is `auto` or
`off`, and the bug is present.

Why is it necessary?  Specifically, what action can be taken based on KVM logging
that can't reasonably be taken based on all the other information provided by the
kernel?  We should teach userspace to go look at the vulnerabilites info, not to
scrape the kernel log.