[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Xen-devel] [PATCH] x86/hvm: simplify emulation triggered by vm_event response

On Thu, Feb 4, 2016 at 5:27 AM, Razvan Cojocaru <rcojocaru@xxxxxxxxxxxxxxx> wrote:
Currently, after receiving a vm_event reply requesting emulation,
the actual emulation is triggered in p2m_mem_access_check(),
which means that we're waiting for the page fault to occur again
before emulating. Aside from the performance impact, this
complicates the code since between hvm_do_resume() and the second
page fault it is possible that the latter becomes a completely
new page fault - hence checking that EIP and the GPA match with
the ones in the original page fault. If they don't, duplicate
EPT fault vm_events will occur, of which a monitoring application
needs to be aware.
This patch makes struct arch_vm_event smaller (since we no longer
need to track eip and gpa), removes the checking code from
p2m_mem_access_check(), and moves the emulation in hvm_do_resume().

Signed-off-by: Razvan Cojocaru <rcojocaru@xxxxxxxxxxxxxxx>

Acked-by: Tamas K Lengyel <tamas@xxxxxxxxxxxxx>
Xen-devel mailing list



Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.