linux-kernel - Re: [RFC V3 PATCH 3/6] selftests: kvm: ucall: Allow querying ucall pool gpa

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Message-ID: <Y02aLxlCKWwN62I5@google.com>
Date:   Mon, 17 Oct 2022 18:08:47 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Vishal Annapurve <vannapurve@...gle.com>
Cc:     x86@...nel.org, kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org, pbonzini@...hat.com,
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Subject: Re: [RFC V3 PATCH 3/6] selftests: kvm: ucall: Allow querying ucall
 pool gpa

On Mon, Oct 17, 2022, Vishal Annapurve wrote:
> This is much sleeker and will avoid hacking KVM for testing. Only
> caveat here is that these tests will not be able to exercise implicit
> conversion path if we go this route.

Yeah, I think that's a perfectly fine tradeoff.  Implicit conversion isn't strictly
a UPM feature, e.g. if TDX and SNP "architecturally" disallowed implicit conversions,
then KVM wouldn't need to support implicit conversions at all, i.e. that testing can
be punted to SNP and/or TDX selftests.