KVM: emulator: do not needlesly sync registers from emulator ctxt to vcpu

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Currently we sync registers back and forth before/after exiting
to userspace for IO, but during IO device model shouldn't need to
read/write the registers, so we can as well skip those sync points. The
only exaception is broken vmware backdor interface. The new code sync
registers content during IO only if registers are read from/written to
by userspace in the middle of the IO operation and this almost never
happens in practise.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

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Gleb Natapov 2011-03-31 12:06:41 +02:00 • committed by Avi Kivity

parent 618ff15de1

commit 7ae441eac5

2 changed files with 40 additions and 9 deletions

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arch/x86/include/asm/kvm_host.h

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47

arch/x86/kvm/x86.c

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