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authorPaolo Bonzini <pbonzini@redhat.com>2016-07-06 13:23:51 +0200
committerYunhong Jiang <yunhong.jiang@linux.intel.com>2016-07-18 08:10:40 -0700
commit594e1a937a4a019862f6b6e14516bd4e4be9e16f (patch)
tree3e0cc17919b7c018c1ee7050773741ca6932fb53 /qemu/hw
parentae6912551e1bc31e4b846221b7cf5ec2aac76104 (diff)
KVM: nVMX: keep preemption timer enabled during L2 execution
Because the vmcs12 preemption timer is emulated through a separate hrtimer, we can keep on using the preemption timer in the vmcs02 to emulare L1's TSC deadline timer. However, the corresponding bit in the pin-based execution control field must be kept consistent between vmcs01 and vmcs02. On vmentry we copy it into the vmcs02; on vmexit the preemption timer must be disabled in the vmcs01 if a preemption timer vmexit happened while in guest mode. The preemption timer value in the vmcs02 is set by vmx_vcpu_run, so it need not be considered in prepare_vmcs02. Cc: Yunhong Jiang <yunhong.jiang@intel.com> Cc: Haozhong Zhang <haozhong.zhang@intel.com> Tested-by: Wanpeng Li <kernellwp@gmail.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Change-Id: Iffaea7689d4e653dc6224a6f05c6e5ba2fb5c8a8 upstream-status: backport Signed-off-by: Yunhong Jiang <yunhong.jiang@linux.intel.com>
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