From: He, Qing Date: Mon, 30 Apr 2007 06:45:24 +0000 (+0300) Subject: KVM: VMX: Enable io bitmaps to avoid IO port 0x80 VMEXITs X-Git-Tag: v2.6.23-rc1~520^2~79 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fdef3ad1b38660d74a29abc990940b5dbaaf3fc9;p=pandora-kernel.git KVM: VMX: Enable io bitmaps to avoid IO port 0x80 VMEXITs 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 Signed-off-by: Avi Kivity --- Reading git-diff-tree failed