linux-kernel - Re: [PATCH 1/8] xen/x86: Remove PVH support

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Message-ID: <6ec04325-1e51-36c7-eeec-5e0352c4c34b@oracle.com>
Date:   Tue, 18 Oct 2016 10:45:56 -0400
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     Juergen Gross <jgross@...e.com>, david.vrabel@...rix.com
Cc:     roger.pau@...rix.com, linux-kernel@...r.kernel.org,
        xen-devel@...ts.xenproject.org
Subject: Re: [PATCH 1/8] xen/x86: Remove PVH support

On 10/18/2016 09:46 AM, Juergen Gross wrote:
> On 14/10/16 20:05, Boris Ostrovsky wrote:
>> We are replacing existing PVH guests with new implementation.
>>
>> Signed-off-by: Boris Ostrovsky <boris.ostrovsky@...cle.com>
> Reviewed-by: Juergen Gross <jgross@...e.com>
>
> with the following addressed:
>
>> diff --git a/include/xen/xen.h b/include/xen/xen.h
>> index f0f0252..d0f9684 100644
>> --- a/include/xen/xen.h
>> +++ b/include/xen/xen.h
>> @@ -29,17 +29,6 @@ enum xen_domain_type {
>>  #define xen_initial_domain()	(0)
>>  #endif	/* CONFIG_XEN_DOM0 */
>>  
>> -#ifdef CONFIG_XEN_PVH
>> -/* This functionality exists only for x86. The XEN_PVHVM support exists
>> - * only in x86 world - hence on ARM it will be always disabled.
>> - * N.B. ARM guests are neither PV nor HVM nor PVHVM.
>> - * It's a bit like PVH but is different also (it's further towards the H
>> - * end of the spectrum than even PVH).
>> - */
>> -#include <xen/features.h>
>> -#define xen_pvh_domain() (xen_pv_domain() && \
>> -			  xen_feature(XENFEAT_auto_translated_physmap))
>> -#else
>>  #define xen_pvh_domain()	(0)
> Any reason you don't remove this, too (together with its last user in
> arch/x86/xen/grant-table.c) ?

grant-table.c is in fact one of the reasons: we will be using that code
for PVHv2 again so I kept it to avoid unnecessary code churn.

Also, we want to have a nop definition of xen_pvh_domain() for
!CONFIG_XEN_PVH.

-boris