On Fri, 05 Dec 2014 14:06:53 +0000
"Jan Beulich" <jbeul...@suse.com> wrote:
> PVH guests are not supposed to access I/O ports they weren't given
> access to (there's nothing to handle emulation of such accesses).
>
> Reported-by: Roger Pau Monné<roger....@citrix.com>
> Signed-off-by: Jan Beulich <jbeul...@suse.com>
> ---
> Note: Only compile tested so far.
>
> --- a/xen/arch/x86/hvm/vmx/vmx.c
> +++ b/xen/arch/x86/hvm/vmx/vmx.c
> @@ -3082,6 +3082,9 @@ void vmx_vmexit_handler(struct cpu_user_
> }
>
> case EXIT_REASON_IO_INSTRUCTION:
> + if ( unlikely(is_pvh_vcpu(v)) )
> + goto exit_and_crash;
> +
> __vmread(EXIT_QUALIFICATION, &exit_qualification);
> if ( exit_qualification & 0x10 )
> {
Actually, handle_pio() will eventually reach handle_pvh_io() which
would access check via admin_io_okay, so that path should be OK,
right?
thanks,
Mukesh
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