KVM: VMX: Enable io bitmaps to avoid IO port 0x80 VMEXITs

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This patch enables IO bitmaps control on vmx and unmask the 0x80 port to
avoid VMEXITs caused by accessing port 0x80. 0x80 is used as delays (see
include/asm/io.h), and handling VMEXITs on its access is unnecessary but
slows things down. This patch improves kernel build test at around
3%~5%.
	Because every VM uses the same io bitmap, it is shared between
all VMs rather than a per-VM data structure.

Signed-off-by: Qing He <qing.he@intel.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>

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He, Qing 2007-04-30 09:45:24 +03:00 • committed by Avi Kivity

parent 8f41958bdd

commit fdef3ad1b3

1 changed files with 46 additions and 4 deletions

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drivers/kvm/vmx.c

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