KVM: x86 emulator: access GPRs on demand

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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>

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Avi Kivity 2012-08-27 23:46:17 +03:00 • committed by Marcelo Tosatti

parent 66a03505a7

commit dd856efafe

3 changed files with 220 additions and 144 deletions

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20

arch/x86/include/asm/kvm_emulate.h

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299

arch/x86/kvm/emulate.c

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45

arch/x86/kvm/x86.c

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