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| author | Junaid Shahid | 2018-06-27 23:59:11 +0200 |
|---|---|---|
| committer | Paolo Bonzini | 2018-08-06 17:58:54 +0200 |
| commit | 50c28f21d045dde8c52548f8482d456b3f0956f5 (patch) | |
| tree | f0c046a9dfba1a1b0aec3b286faed82df10dc92e /arch/x86/kvm/mmu.c | |
| parent | kvm: x86: Support resetting the MMU context without resetting roots (diff) | |
| download | kernel-qcow2-linux-50c28f21d045dde8c52548f8482d456b3f0956f5.tar.gz kernel-qcow2-linux-50c28f21d045dde8c52548f8482d456b3f0956f5.tar.xz kernel-qcow2-linux-50c28f21d045dde8c52548f8482d456b3f0956f5.zip | |
kvm: x86: Use fast CR3 switch for nested VMX
Use the fast CR3 switch mechanism to locklessly change the MMU root
page when switching between L1 and L2. The switch from L2 to L1 should
always go through the fast path, while the switch from L1 to L2 should
go through the fast path if L1's CR3/EPTP for L2 hasn't changed
since the last time.
Signed-off-by: Junaid Shahid <junaids@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/mmu.c')
| -rw-r--r-- | arch/x86/kvm/mmu.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index 3d822a97dfa1..9b73cfcef917 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -4054,7 +4054,7 @@ static bool fast_cr3_switch(struct kvm_vcpu *vcpu, gpa_t new_cr3, return false; swap(mmu->root_hpa, mmu->prev_root.hpa); - mmu->prev_root.cr3 = kvm_read_cr3(vcpu); + mmu->prev_root.cr3 = mmu->get_cr3(vcpu); if (new_cr3 == prev_cr3 && VALID_PAGE(mmu->root_hpa) && @@ -4091,6 +4091,7 @@ void kvm_mmu_new_cr3(struct kvm_vcpu *vcpu, gpa_t new_cr3) { __kvm_mmu_new_cr3(vcpu, new_cr3, kvm_mmu_calc_root_page_role(vcpu)); } +EXPORT_SYMBOL_GPL(kvm_mmu_new_cr3); static unsigned long get_cr3(struct kvm_vcpu *vcpu) { @@ -4725,12 +4726,13 @@ kvm_calc_shadow_ept_root_page_role(struct kvm_vcpu *vcpu, bool accessed_dirty) } void kvm_init_shadow_ept_mmu(struct kvm_vcpu *vcpu, bool execonly, - bool accessed_dirty) + bool accessed_dirty, gpa_t new_eptp) { struct kvm_mmu *context = &vcpu->arch.mmu; union kvm_mmu_page_role root_page_role = kvm_calc_shadow_ept_root_page_role(vcpu, accessed_dirty); + __kvm_mmu_new_cr3(vcpu, new_eptp, root_page_role); context->shadow_root_level = PT64_ROOT_4LEVEL; context->nx = true; |