linux-kernel - Re: [Xen-devel] [PATCH linux 4/8] x86/xen: use xen_vcpu_id mapping when pointing vcpu_info to the shared

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Date:	Wed, 29 Jun 2016 13:32:26 +0100
From:	David Vrabel <david.vrabel@...rix.com>
To:	Vitaly Kuznetsov <vkuznets@...hat.com>,
	<xen-devel@...ts.xenproject.org>
CC:	Juergen Gross <jgross@...e.com>,
	Stefano Stabellini <sstabellini@...nel.org>, <x86@...nel.org>,
	<linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...hat.com>,
	David Vrabel <david.vrabel@...rix.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [Xen-devel] [PATCH linux 4/8] x86/xen: use xen_vcpu_id mapping
 when pointing vcpu_info to the shared_info page

On 28/06/16 17:47, Vitaly Kuznetsov wrote:
> shared_info page has space for 32 vcpu info slots for first 32 vCPUs but
> these are the first 32 vCPUs from Xen's perspective and we should map them
> accordingly with the newly introduced xen_vcpu_id mapping.
> 
> Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>
> ---
>  arch/x86/xen/enlighten.c | 15 ++++++++++-----
>  1 file changed, 10 insertions(+), 5 deletions(-)
> 
> diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
> index 69f4c0c..1596626 100644
> --- a/arch/x86/xen/enlighten.c
> +++ b/arch/x86/xen/enlighten.c
> @@ -189,6 +189,7 @@ static void xen_vcpu_setup(int cpu)
>  	struct vcpu_register_vcpu_info info;
>  	int err;
>  	struct vcpu_info *vcpup;
> +	int xen_cpu = per_cpu(xen_vcpu_id, cpu);

I think there should be a

static inline int xen_vcpu_nr(int cpu)
{
	return per_cpu(xen_vcpu_id, cpu);
}

helper function.

David