linux-kernel - Re: [PATCH] KVM: selftests: Add a test for x86's fastops emulation

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Message-ID: <174674524889.1512631.9502586158459413855.b4-ty@google.com>
Date: Thu,  8 May 2025 16:04:11 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Sean Christopherson <seanjc@...gle.com>, Paolo Bonzini <pbonzini@...hat.com>
Cc: kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] KVM: selftests: Add a test for x86's fastops emulation

On Mon, 05 May 2025 18:12:50 -0700, Sean Christopherson wrote:
> Add a test to verify KVM's fastops emulation via forced emulation.  KVM's
> so called "fastop" infrastructure executes the to-be-emulated instruction
> directly on hardware instead of manually emulating the instruction in
> software, using various shenanigans to glue together the emulator context
> and CPU state, e.g. to get RFLAGS fed into the instruction and back out
> for the emulator.
> 
> [...]

Applied quickly to kvm-x86 selftests to make it easier to test's PeterZ's
fastops changes, and to get early test coverage on more hardware (in case
my assertion that undefined arithmetic flags are deterministic proves to
be wrong).

[1/1] KVM: selftests: Add a test for x86's fastops emulation
      https://github.com/kvm-x86/linux/commit/5e9ac644c40f

--
https://github.com/kvm-x86/linux/tree/next