From mboxrd@z Thu Jan  1 00:00:00 1970
From: Keir Fraser <keir.xen@gmail.com>
Subject: Re: [PATCH] x86/HVM: 32-bit IN result must be
 zero-extended to 64 bits (part 2)
Date: Wed, 13 Nov 2013 18:09:14 +0000
Message-ID: <CEA970CA.64E9F%keir.xen@gmail.com>
References: <5283C05E0200007800102F78@nat28.tlf.novell.com>
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To: Jan Beulich <JBeulich@suse.com>, xen-devel <xen-devel@lists.xenproject.org>
List-Id: xen-devel@lists.xenproject.org

On 13/11/2013 17:09, "Jan Beulich" <JBeulich@suse.com> wrote:

> Just spotted a counterpart of what commit 9d89100b (same title) dealt
> with.
> 
> Signed-off-by: Jan Beulich <jbeulich@suse.com>

Acked-by: Keir Fraser <keir@xen.org>

> --- 2013-10-16.orig/xen/arch/x86/hvm/io.c 2013-11-13 17:45:16.000000000 +0100
> +++ 2013-10-16/xen/arch/x86/hvm/io.c 2013-11-13 17:47:47.000000000 +0100
> @@ -290,8 +290,10 @@ void hvm_io_assist(void)
>          (void)handle_mmio();
>          break;
>      case HVMIO_handle_pio_awaiting_completion:
> -        memcpy(&guest_cpu_user_regs()->eax,
> -               &p->data, vio->io_size);
> +        if ( vio->io_size == 4 ) /* Needs zero extension. */
> +            guest_cpu_user_regs()->rax = (uint32_t)p->data;
> +        else
> +            memcpy(&guest_cpu_user_regs()->rax, &p->data, vio->io_size);
>          break;
>      default:
>          break;
> 
> 
> 
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