linux-kernel - Re: [PATCH v4 2/3] selftests: KVM: AMD Nested test infrastructure

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Date:   Fri, 07 Feb 2020 10:16:34 +0100
From:   Vitaly Kuznetsov <vkuznets@...hat.com>
To:     Krish Sadhukhan <krish.sadhukhan@...cle.com>
Cc:     thuth@...hat.com, drjones@...hat.com, wei.huang2@....com,
        Eric Auger <eric.auger@...hat.com>, eric.auger.pro@...il.com,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        pbonzini@...hat.com
Subject: Re: [PATCH v4 2/3] selftests: KVM: AMD Nested test infrastructure

Krish Sadhukhan <krish.sadhukhan@...cle.com> writes:

...
> +	asm volatile (
>> +		"vmload\n\t"
> Don't we need to set %rax before calling vmload ?
>

No, because it is already there

...
>> +		: : [vmcb] "r" (vmcb), [vmcb_gpa] "a" (vmcb_gpa)

"a" constraint in input operands does the job.

-- 
Vitaly