tree d074a16680f3a39798f372e16426476aa7f6e1df
parent 66a03505a7fcc70187319ef2318832f4d3c451a6
author Avi Kivity <avi@redhat.com> 1346100377 +0300
committer Marcelo Tosatti <mtosatti@redhat.com> 1346103535 -0300

KVM: x86 emulator: access GPRs on demand

Instead of populating the entire register file, read in registers
as they are accessed, and write back only the modified ones.  This
saves a VMREAD and VMWRITE on Intel (for rsp, since it is not usually
used during emulation), and a two 128-byte copies for the registers.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>