1. 12 6月, 2018 4 次提交
  2. 04 6月, 2018 3 次提交
    • J
      kvm: nVMX: Add support for "VMWRITE to any supported field" · f4160e45
      Jim Mattson 提交于
      Add support for "VMWRITE to any supported field in the VMCS" and
      enable this feature by default in L1's IA32_VMX_MISC MSR. If userspace
      clears the VMX capability bit, the old behavior will be restored.
      
      Note that this feature is a prerequisite for kvm in L1 to use VMCS
      shadowing, once that feature is available.
      Signed-off-by: NJim Mattson <jmattson@google.com>
      Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
      f4160e45
    • J
      kvm: nVMX: Restrict VMX capability MSR changes · a943ac50
      Jim Mattson 提交于
      Disallow changes to the VMX capability MSRs while the vCPU is in VMX
      operation. Although this does break the existing API, it helps to
      avoid some potentially tricky situations for which there is no
      architected behavior.
      Signed-off-by: NJim Mattson <jmattson@google.com>
      Reviewed-by: NKrish Sadhukhan <krish.sadhukhan@oracle.com>
      Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
      a943ac50
    • W
      KVM: VMX: Optimize tscdeadline timer latency · c5ce8235
      Wanpeng Li 提交于
      'Commit d0659d94 ("KVM: x86: add option to advance tscdeadline
      hrtimer expiration")' advances the tscdeadline (the timer is emulated
      by hrtimer) expiration in order that the latency which is incurred
      by hypervisor (apic_timer_fn -> vmentry) can be avoided. This patch
      adds the advance tscdeadline expiration support to which the tscdeadline
      timer is emulated by VMX preemption timer to reduce the hypervisor
      lantency (handle_preemption_timer -> vmentry). The guest can also
      set an expiration that is very small (for example in Linux if an
      hrtimer feeds a expiration in the past); in that case we set delta_tsc
      to 0, leading to an immediately vmexit when delta_tsc is not bigger than
      advance ns.
      
      This patch can reduce ~63% latency (~4450 cycles to ~1660 cycles on
      a haswell desktop) for kvm-unit-tests/tscdeadline_latency when testing
      busy waits.
      
      Cc: Paolo Bonzini <pbonzini@redhat.com>
      Cc: Radim Krčmář <rkrcmar@redhat.com>
      Signed-off-by: NWanpeng Li <wanpengli@tencent.com>
      Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
      c5ce8235
  3. 02 6月, 2018 7 次提交
  4. 26 5月, 2018 10 次提交
  5. 25 5月, 2018 16 次提交