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Re: [Xen-devel] [PATCH v3 1/2] x86/mm: Change default value for suppress #VE in set_mem_access()

On Tue, Jul 18, 2017 at 9:25 AM, Adrian Pop <apop@xxxxxxxxxxxxxxx> wrote:
> From: Vlad Ioan Topan <itopan@xxxxxxxxxxxxxxx>
> The default value for the "suppress #VE" bit set by set_mem_access()
> currently depends on whether the call is made from the same domain (the
> bit is set when called from another domain and cleared if called from
> the same domain). This patch changes that behavior to inherit the old
> suppress #VE bit value if it is already set and to set it to 1
> otherwise, which is safer and more reliable.

With the way things are currently if the in-guest tool calls
set_mem_access for an altp2m view, it implies it wants to receive #VE
for it. Wouldn't this change in this patch effectively make it
impossible for an in-guest tool to decide which pages it wants to
receive #VE for? The new HVMOP you are introducing is only accessible
from a privileged domain..


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