KVM: Use thread debug register storage instead of kvm specific data

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Instead of saving the debug registers from the processor to a kvm data
structure, rely in the debug registers stored in the thread structure.
This allows us not to save dr6 and dr7.

Reduces lightweight vmexit cost by 350 cycles, or 11 percent.

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

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This commit is contained in:

Avi Kivity 2009-09-01 12:34:07 +03:00

parent 6ba6617875

commit 3d53c27d05

2 changed files with 7 additions and 18 deletions

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3

arch/x86/include/asm/kvm_host.h

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22

arch/x86/kvm/x86.c

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