linux-kernel - Re: [PATCH v2 18/23] xen: allow privcmd for HVM guests

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Date:	Tue, 7 Aug 2012 14:31:55 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Stefano Stabellini <stefano.stabellini@...citrix.com>
Cc:	linux-kernel@...r.kernel.org, xen-devel@...ts.xensource.com,
	Ian.Campbell@...rix.com, tim@....org,
	linux-arm-kernel@...ts.infradead.org, linaro-dev@...ts.linaro.org,
	catalin.marinas@....com, arnd@...db.de
Subject: Re: [PATCH v2 18/23] xen: allow privcmd for HVM guests

On Mon, Aug 06, 2012 at 03:27:21PM +0100, Stefano Stabellini wrote:
> This patch removes the "return -ENOSYS" for auto_translated_physmap
> guests from privcmd_mmap, thus it allows ARM guests to issue privcmd
> mmap calls. However privcmd mmap calls are still going to fail for HVM
> and hybrid guests on x86 because the xen_remap_domain_mfn_range
> implementation is currently PV only.

Looks good. Ack from me.
> 
> Changes in v2:
> 
> - better commit message;
> - return -EINVAL from xen_remap_domain_mfn_range if
>   auto_translated_physmap.
> 
> Signed-off-by: Stefano Stabellini <stefano.stabellini@...citrix.com>
> ---
>  arch/x86/xen/mmu.c    |    3 +++
>  drivers/xen/privcmd.c |    4 ----
>  2 files changed, 3 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
> index 3a73785..885a223 100644
> --- a/arch/x86/xen/mmu.c
> +++ b/arch/x86/xen/mmu.c
> @@ -2310,6 +2310,9 @@ int xen_remap_domain_mfn_range(struct vm_area_struct *vma,
>  	unsigned long range;
>  	int err = 0;
>  
> +	if (xen_feature(XENFEAT_auto_translated_physmap))
> +		return -EINVAL;
> +
>  	prot = __pgprot(pgprot_val(prot) | _PAGE_IOMAP);
>  
>  	BUG_ON(!((vma->vm_flags & (VM_PFNMAP | VM_RESERVED | VM_IO)) ==
> diff --git a/drivers/xen/privcmd.c b/drivers/xen/privcmd.c
> index ccee0f1..85226cb 100644
> --- a/drivers/xen/privcmd.c
> +++ b/drivers/xen/privcmd.c
> @@ -380,10 +380,6 @@ static struct vm_operations_struct privcmd_vm_ops = {
>  
>  static int privcmd_mmap(struct file *file, struct vm_area_struct *vma)
>  {
> -	/* Unsupported for auto-translate guests. */
> -	if (xen_feature(XENFEAT_auto_translated_physmap))
> -		return -ENOSYS;
> -
>  	/* DONTCOPY is essential for Xen because copy_page_range doesn't know
>  	 * how to recreate these mappings */
>  	vma->vm_flags |= VM_RESERVED | VM_IO | VM_DONTCOPY | VM_PFNMAP;
> -- 
> 1.7.2.5
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