linux-kernel - RE: [PATCH] KVM: selftests: x86: Avoid using SSE/AVX instructions

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Message-ID: <2a62086810c14d0e88e38706a06aedde@AcuMS.aculab.com>
Date: Mon, 23 Sep 2024 11:16:34 +0000
From: David Laight <David.Laight@...LAB.COM>
To: 'Vitaly Kuznetsov' <vkuznets@...hat.com>, "kvm@...r.kernel.org"
	<kvm@...r.kernel.org>, Paolo Bonzini <pbonzini@...hat.com>, "Sean
 Christopherson" <seanjc@...gle.com>
CC: Jan Richter <jarichte@...hat.com>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] KVM: selftests: x86: Avoid using SSE/AVX instructions

From: Vitaly Kuznetsov <vkuznets@...hat.com>
> Sent: 20 September 2024 16:44
> 
> Some distros switched gcc to '-march=x86-64-v3' by default and while it's
> hard to find a CPU which doesn't support it today,

I didn't think that any of the Atom based cpu supported AVX.
I'm pretty sure one we use that are still in production as
server motherboards don't support it.

Doesn't -v3 also require support for the VEX encoding.
Which removes a lot of perfectly reasonable cpu?

	David

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