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Jan Beulich
a8fcd80c8f
When an FPU instruction with a memory destination fails during the memory write, it should not affect FPU register state. Due to the way we emulate FPU (and SIMD) instructions, we can only guarantee this by - backing out changes to the FPU register state in such a case or - doing a descriptor read and/or page walk up front, perhaps with the stubs accessing the actual memory location then. The latter would require a significant change in how the emulator does its guest memory accessing, so for now the former variant is being chosen. Signed-off-by: Jan Beulich <jbeulich@suse.com> Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com> Reviewed-by: Kevin Tian <kevin.tian@intel.com> Reviewed-by: Paul Durrant <paul.durrant@citrix.com> [hvm/emulate.c] Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>