linux-kernel - Re: [RFC PATCH 4/4] KVM: selftests: Add the sync

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Message-ID: <3e462f1d-c9c0-ac26-ed59-182fbbf60340@redhat.com>
Date:   Mon, 20 May 2019 13:19:40 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Thomas Huth <thuth@...hat.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Janosch Frank <frankja@...ux.ibm.com>, kvm@...r.kernel.org
Cc:     Radim Krčmář <rkrcmar@...hat.com>,
        Shuah Khan <shuah@...nel.org>,
        David Hildenbrand <david@...hat.com>,
        Cornelia Huck <cohuck@...hat.com>,
        Andrew Jones <drjones@...hat.com>,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        linux-s390@...r.kernel.org
Subject: Re: [RFC PATCH 4/4] KVM: selftests: Add the sync_regs test for s390x

On 16/05/19 13:12, Thomas Huth wrote:
> +#define VCPU_ID 5
> +
> +static void guest_code(void)
> +{
> +	for (;;) {
> +		asm volatile ("diag 0,0,0x501");
> +		asm volatile ("ahi 11,1");
> +	}

I'd like this to use something like

	register u32 stage = 0 asm("11");
	...
	stage++

instead (yes, it should be fixed in x86 too).

Paolo