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Re: [PATCH v4 02/10] x86/vmx: add IPT cpu feature

On 02/07/2020 09:50, Jan Beulich wrote:
On 02.07.2020 10:42, Julien Grall wrote:
On 02/07/2020 09:29, Jan Beulich wrote:
I'm with Andrew here, fwiw, as long as the little bit of code that
is actually put in common/ or include/xen/ doesn't imply arbitrary
restrictions on acceptable values.
Well yes the code is simple. However, the code as it is wouldn't be
usuable on other architecture without additional work (aside arch
specific code). For instance, there is no way to map the buffer outside
of Xen as it is all x86 specific.

If you want the allocation to be in the common code, then the
infrastructure to map/unmap the buffer should also be in common code.
Otherwise, there is no point to allocate it in common.

I don't think I agree here - I see nothing wrong with exposing of
the memory being arch specific, when allocation is generic. This
is no different from, in just x86, allocation logic being common
to PV and HVM, but exposing being different for both.

Are you suggesting that the way it would be exposed may be different for other architecture?

If so, this is one more reason to not impose a way for allocating the buffer in the common code until another arch add support for vmtrace.


Julien Grall



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