Re: [Xen-devel] [PATCH v5 4/8] x86: introduce hypervisor framework

[Jan Beulich <jbeulich@xxxxxxxx>]

On 30.11.2019 12:57, Wei Liu wrote:
> We will soon implement Hyper-V support for Xen. Add a framework for
> that.
> 
> This requires moving some of the hypervisor_* functions from xen.h to
> hypervisor.h.
> 
> Signed-off-by: Wei Liu <liuwe@xxxxxxxxxxxxx>

Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
with one more adjustment (sorry for noticing only now):

> --- /dev/null
> +++ b/xen/arch/x86/guest/hypervisor.c
> @@ -0,0 +1,45 @@
> +/******************************************************************************
> + * arch/x86/guest/hypervisor.c
> + *
> + * Support for detecting and running under a hypervisor.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; If not, see <http://www.gnu.org/licenses/>.
> + *
> + * Copyright (c) 2019 Microsoft.
> + */
> +#include <xen/init.h>
> +#include <xen/types.h>
> +
> +#include <asm/cache.h>
> +#include <asm/guest/hypervisor.h>
> +
> +static const struct hypervisor_ops __read_mostly *ops;

The __read_mostly is misplaced - it's an attribute of the variable,
not its type, and hence belongs after the * . It just so happens
that the compiler is (still) relatively relaxed in what it accepts,
but I think at least the gcc manual has a warning towards future
more strict behavior.

Jan

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