linux-kernel - Re: [PATCH 1/3] Make xen_remap_domain_mfn_range return value meaningful in case of error

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Message-ID: <20111220182118.GB7152@phenom.dumpdata.com>
Date:	Tue, 20 Dec 2011 13:21:18 -0500
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Adin Scannell <adin@...nnell.ca>
Cc:	xen-devel@...ts.xensource.com, konrad@...nok.org,
	andres@...dcentric.ca, adin@...dcentric.com, olaf@...fle.de,
	JBeulich@...e.com, linux-kernel@...r.kernel.org,
	Jan Beulich <jbeulich@...ell.com>
Subject: Re: [PATCH 1/3] Make xen_remap_domain_mfn_range return value
 meaningful in case of error

On Tue, Dec 20, 2011 at 01:36:51AM -0500, Adin Scannell wrote:
> Original patch from Olaf Hering <ohering@...ell.com>
> 
> This change fixes the xc_map_foreign_bulk interface, which would
> otherwise cause SIGBUS when pages are gone because -ENOENT is not
> returned as expected by the IOCTL_PRIVCMD_MMAPBATCH_V2 ioctl.
> 
> Signed-off-by: Jan Beulich <jbeulich@...ell.com>
> 
> This is a port to the mainline Linux tree.  Functions were refactored and
> renamed.  I believe that this is the only required change to match the
> semantics of the original patch.

Ok, this can go in on itself. Thought the title needs to be change
(to have xen/mmu in it). 

Looking at the code it looks as the IOCTL_PRIVCMD_MMAP could now return -Exx
instead of -EFAULT. Which seems to be OK with the toolstack (at least with
4.1.x).

Is this patch OK with 4.0 toolstack? Does it handle the case of getting
-EsomethingelsethanEFAULT ?

Thanks.
> 
> Signed-off-by: Adin Scannell <adin@...nnell.ca>
> ---
>  arch/x86/xen/mmu.c |    4 ++--
>  1 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
> index 87f6673..288a7fc 100644
> --- a/arch/x86/xen/mmu.c
> +++ b/arch/x86/xen/mmu.c
> @@ -2350,8 +2350,8 @@ int xen_remap_domain_mfn_range(struct vm_area_struct *vma,
>  		if (err)
>  			goto out;
>  
> -		err = -EFAULT;
> -		if (HYPERVISOR_mmu_update(mmu_update, batch, NULL, domid) < 0)
> +		err = HYPERVISOR_mmu_update(mmu_update, batch, NULL, domid);
> +		if (err < 0)
>  			goto out;
>  
>  		nr -= batch;
> -- 
> 1.6.2.5
> 
> --
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