x86/altp2m: add altp2m_vcpu_disable_notify
Allow altp2m users to disable #VE/VMFUNC alone. Currently it is
only possible to disable this functionality when we disable altp2m
completely; #VE/VMFUNC can only be enabled once per altp2m session.
In addition to making things complete, disabling #VE is also a
workaround for CFW116 ("When Virtualization Exceptions are Enabled,
EPT Violations May Generate Erroneous Virtualization Exceptions")
on Xeon E-2100 CPUs.
Signed-off-by: Razvan Cojocaru <rcojocaru@bitdefender.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Wei Liu <wei.liu2@citrix.com>
projects / xen.git / commit