linux-kernel - Re: [PATCH 2/4] PF: Move architecture specifics to the backends

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Date:	Mon, 08 Jul 2013 12:50:32 +0100
From:	Marc Zyngier <marc.zyngier@....com>
To:	Dominik Dingel <dingel@...ux.vnet.ibm.com>
Cc:	Gleb Natapov <gleb@...hat.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Xiantao Zhang <xiantao.zhang@...el.com>,
	Alexander Graf <agraf@...e.de>,
	Christoffer Dall <christoffer.dall@...aro.org>,
	Ralf Baechle <ralf@...ux-mips.org>, <kvm@...r.kernel.org>,
	<linux-s390@...r.kernel.org>, <linux-mm@...ck.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/4] PF: Move architecture specifics to the backends

On 2013-07-05 21:55, Dominik Dingel wrote:
> Current common codes uses PAGE_OFFSET to indicate a bad host virtual 
> address.
> As this check won't work on architectures that don't map kernel and
> user memory
> into the same address space (e.g. s390), it is moved into architcture
> specific
> code.
>
> Signed-off-by: Dominik Dingel <dingel@...ux.vnet.ibm.com>
> ---
>  arch/arm/include/asm/kvm_host.h     |  8 ++++++++
>  arch/ia64/include/asm/kvm_host.h    |  3 +++
>  arch/mips/include/asm/kvm_host.h    |  6 ++++++
>  arch/powerpc/include/asm/kvm_host.h |  8 ++++++++
>  arch/s390/include/asm/kvm_host.h    | 12 ++++++++++++
>  arch/x86/include/asm/kvm_host.h     |  8 ++++++++
>  include/linux/kvm_host.h            |  8 --------
>  7 files changed, 45 insertions(+), 8 deletions(-)

[...]

> diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
> index a63d83e..210f493 100644
> --- a/include/linux/kvm_host.h
> +++ b/include/linux/kvm_host.h
> @@ -85,14 +85,6 @@ static inline bool is_noslot_pfn(pfn_t pfn)
>  	return pfn == KVM_PFN_NOSLOT;
>  }
>
> -#define KVM_HVA_ERR_BAD		(PAGE_OFFSET)
> -#define KVM_HVA_ERR_RO_BAD	(PAGE_OFFSET + PAGE_SIZE)
> -
> -static inline bool kvm_is_error_hva(unsigned long addr)
> -{
> -	return addr >= PAGE_OFFSET;
> -}
> -
>  #define KVM_ERR_PTR_BAD_PAGE	(ERR_PTR(-ENOENT))
>
>  static inline bool is_error_page(struct page *page)

Nit: This breaks arm64. I suppose the patches have been created before 
the arm64 code got merged, so I'd expect the next version of this series 
to deal with arm64 as well.

Thanks,

         M.
-- 
Fast, cheap, reliable. Pick two.
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