From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Jan Beulich" <JBeulich@suse.com>
Subject: Re: [PATCH v3 07/32] xen/x86: fix arch_set_info_guest
 for HVM guests
Date: Mon, 13 Jul 2015 15:01:53 +0100
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References: <1435923310-9019-1-git-send-email-roger.pau@citrix.com>
	<1435923310-9019-8-git-send-email-roger.pau@citrix.com>
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To: Roger Pau Monne <roger.pau@citrix.com>
Cc: Andrew Cooper <andrew.cooper3@citrix.com>, xen-devel@lists.xenproject.org
List-Id: xen-devel@lists.xenproject.org

>>> On 03.07.15 at 13:34, <roger.pau@citrix.com> wrote:
> --- a/xen/arch/x86/domain.c
> +++ b/xen/arch/x86/domain.c
> @@ -795,6 +795,15 @@ int arch_set_info_guest(
>                c.nat->fs_base || c.nat->gs_base_user)) )
>              return -EINVAL;
>      }
> +    else if ( is_hvm_domain(d) )
> +    {
> +        if ( c(ctrlreg[0]) || c(ctrlreg[1]) || c(ctrlreg[2]) ||
> +             c(ctrlreg[3]) || c(ctrlreg[4]) || c(ctrlreg[5]) ||
> +             c(ctrlreg[6]) || c(ctrlreg[7]) || c(ldt_base) ||
> +             c(ldt_ents) || c(kernel_ss) || c(kernel_sp) ||
> +             c(gdt_ents) )
> +            return -EINVAL;
> +    }

In addition to what Andrew said - is the use of c() here really correct
considering

    compat = is_pv_32bit_domain(d);

#define c(fld) (compat ? (c.cmp->fld) : (c.nat->fld))

near the beginning of the function?

Jan