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| author |   Paolo Bonzini <pbonzini@redhat.com> | 2016-07-06 13:23:51 +0200 |
|---|---|---|
| committer |   Yunhong Jiang <yunhong.jiang@linux.intel.com> | 2016-07-18 08:10:40 -0700 |
| commit | 594e1a937a4a019862f6b6e14516bd4e4be9e16f (patch) | |
| tree | 3e0cc17919b7c018c1ee7050773741ca6932fb53 /kernel/mm/failslab.c | |
| parent | ae6912551e1bc31e4b846221b7cf5ec2aac76104 (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>
Diffstat (limited to 'kernel/mm/failslab.c')
0 files changed, 0 insertions, 0 deletions