linux-kernel - Re: [PATCH v3 3/9] xen/balloon: Share common memory reservation routines

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Date:   Wed, 13 Jun 2018 15:27:20 +0300
From:   Oleksandr Andrushchenko <Oleksandr_Andrushchenko@...m.com>
To:     Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Oleksandr Andrushchenko <andr2000@...il.com>,
        xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linux-media@...r.kernel.org,
        jgross@...e.com, konrad.wilk@...cle.com
Cc:     daniel.vetter@...el.com, dongwon.kim@...el.com,
        matthew.d.roper@...el.com
Subject: Re: [PATCH v3 3/9] xen/balloon: Share common memory reservation
 routines

On 06/13/2018 03:03 PM, Oleksandr Andrushchenko wrote:
> On 06/13/2018 03:02 PM, Boris Ostrovsky wrote:
>>
>>
>> On 06/13/2018 02:26 AM, Oleksandr Andrushchenko wrote:
>>> On 06/13/2018 03:47 AM, Boris Ostrovsky wrote:
>>>>
>>>>
>>>> On 06/12/2018 09:41 AM, Oleksandr Andrushchenko wrote:
>>>>> From: Oleksandr Andrushchenko <oleksandr_andrushchenko@...m.com>
>>>>
>>>>> diff --git a/include/xen/mem-reservation.h 
>>>>> b/include/xen/mem-reservation.h
>>>>> new file mode 100644
>>>>> index 000000000000..e0939387278d
>>>>> --- /dev/null
>>>>> +++ b/include/xen/mem-reservation.h
>>>>> @@ -0,0 +1,64 @@
>>>>> +/* SPDX-License-Identifier: GPL-2.0 */
>>>>> +
>>>>> +/*
>>>>> + * Xen memory reservation utilities.
>>>>> + *
>>>>> + * Copyright (c) 2003, B Dragovic
>>>>> + * Copyright (c) 2003-2004, M Williamson, K Fraser
>>>>> + * Copyright (c) 2005 Dan M. Smith, IBM Corporation
>>>>> + * Copyright (c) 2010 Daniel Kiper
>>>>> + * Copyright (c) 2018 Oleksandr Andrushchenko, EPAM Systems Inc.
>>>>> + */
>>>>> +
>>>>> +#ifndef _XENMEM_RESERVATION_H
>>>>> +#define _XENMEM_RESERVATION_H
>>>>> +
>>>>> +#include <linux/kernel.h>
>>>>> +#include <linux/slab.h>
>>>>> +
>>>>> +#include <asm/xen/hypercall.h>
>>>>> +#include <asm/tlb.h>
>>>>> +
>>>>> +#include <xen/interface/memory.h>
>>>>> +#include <xen/page.h>
>>>>
>>>>
>>>> I should have noticed this in the previous post but I suspect most 
>>>> of these includes belong in the C file. For example, there is no 
>>>> reason for hypercall.h here.
>>>>
>>> Yes, it seems that the header can only have
>>> #include <xen/page.h>
>>> Will move the rest into the .c file
>>
>>
>> You may need something for clear_highpage() and maybe for Xen feature 
>> flags. But you'll find out for sure when you try to build. ;-)
>>
> #include <asm/tlb.h>
>
Or even
#include <linux/highmem.h>
according to [1]
> ;)
>> -boris
>>
>>
>>
>>>> -boris
>>>>
>>>>
>>>>> +
>>>>> +static inline void xenmem_reservation_scrub_page(struct page *page)
>>>>> +{
>>>>> +#ifdef CONFIG_XEN_SCRUB_PAGES
>>>>> +    clear_highpage(page);
>>>>> +#endif
>>>>> +}
>>>>> +
>>>>> +#ifdef CONFIG_XEN_HAVE_PVMMU
>>>>> +void __xenmem_reservation_va_mapping_update(unsigned long count,
>>>>> +                        struct page **pages,
>>>>> +                        xen_pfn_t *frames);
>>>>> +
>>>>> +void __xenmem_reservation_va_mapping_reset(unsigned long count,
>>>>> +                       struct page **pages);
>>>>> +#endif
>>>>> +
>>>>> +static inline void xenmem_reservation_va_mapping_update(unsigned 
>>>>> long count,
>>>>> +                            struct page **pages,
>>>>> +                            xen_pfn_t *frames)
>>>>> +{
>>>>> +#ifdef CONFIG_XEN_HAVE_PVMMU
>>>>> +    if (!xen_feature(XENFEAT_auto_translated_physmap))
>>>>> +        __xenmem_reservation_va_mapping_update(count, pages, 
>>>>> frames);
>>>>> +#endif
>>>>> +}
>>>>> +
>>>>> +static inline void xenmem_reservation_va_mapping_reset(unsigned 
>>>>> long count,
>>>>> +                               struct page **pages)
>>>>> +{
>>>>> +#ifdef CONFIG_XEN_HAVE_PVMMU
>>>>> +    if (!xen_feature(XENFEAT_auto_translated_physmap))
>>>>> +        __xenmem_reservation_va_mapping_reset(count, pages);
>>>>> +#endif
>>>>> +}
>>>>> +
>>>>> +int xenmem_reservation_increase(int count, xen_pfn_t *frames);
>>>>> +
>>>>> +int xenmem_reservation_decrease(int count, xen_pfn_t *frames);
>>>>> +
>>>>> +#endif
>>>>>
>>>
>
[1] https://elixir.bootlin.com/linux/v4.17.1/ident/clear_highpage