Re: [Xen-devel] [PATCH v2 2/6] xen/pvh: place the trampoline at page 0x1

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Wed, Jan 17, 2018 at 12:00:41PM +0000, Roger Pau Monne wrote:
> Since PVH guest jump straight into trampoline_setup trampoline_phys is
> not initialized, thus the trampoline is relocated to address 0.
> 
> This works, but has the undesirable effect of having VA 0 mapped to
> MFN 0, which means NULL pointed dereferences no longer trigger a page
> fault.
> 
> In order to solve this, place the trampoline at page 0x1 and reserve
> the memory used by it.
> 
> Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>

Reviewed-by: Wei Liu <wei.liu2@xxxxxxxxxx>

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