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author | Vitaly Kuznetsov <vkuznets@redhat.com> | 2018-10-08 21:28:08 +0200 |
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committer | Paolo Bonzini <pbonzini@redhat.com> | 2018-10-17 00:30:04 +0200 |
commit | 14c07ad89f4d728a468caaea6a769c018c2b8dd6 (patch) | |
tree | ccb089dc2bd41e92d0f0e7adf3891a34f57a325e /mm/kmemleak.c | |
parent | 6a82cd1c7b1e38d3b940fcb35a81e902dd52fb35 (diff) | |
download | linux-14c07ad89f4d728a468caaea6a769c018c2b8dd6.tar.bz2 |
x86/kvm/mmu: introduce guest_mmu
When EPT is used for nested guest we need to re-init MMU as shadow
EPT MMU (nested_ept_init_mmu_context() does that). When we return back
from L2 to L1 kvm_mmu_reset_context() in nested_vmx_load_cr3() resets
MMU back to normal TDP mode. Add a special 'guest_mmu' so we can use
separate root caches; the improved hit rate is not very important for
single vCPU performance, but it avoids contention on the mmu_lock for
many vCPUs.
On the nested CPUID benchmark, with 16 vCPUs, an L2->L1->L2 vmexit
goes from 42k to 26k cycles.
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Reviewed-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'mm/kmemleak.c')
0 files changed, 0 insertions, 0 deletions