From: Joerg Roedel <[email protected]> When the nested intercepts are cached we don't need to call get_user_pages and/or map the nested vmcb on every nested #vmexit to check who will handle the intercept. Further this patch aligns the emulated svm behavior better to real hardware.
Signed-off-by: Joerg Roedel <[email protected]> Signed-off-by: Avi Kivity <[email protected]> diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index b4e2587..75fdfe7 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -80,6 +80,15 @@ struct nested_state { /* gpa pointers to the real vectors */ u64 vmcb_msrpm; + + /* cache for intercepts of the guest */ + u16 intercept_cr_read; + u16 intercept_cr_write; + u16 intercept_dr_read; + u16 intercept_dr_write; + u32 intercept_exceptions; + u64 intercept; + }; struct vcpu_svm { @@ -1455,7 +1464,6 @@ static int nested_svm_exit_handled_real(struct vcpu_svm *svm, void *arg2, void *opaque) { - struct vmcb *nested_vmcb = (struct vmcb *)arg1; bool kvm_overrides = *(bool *)opaque; u32 exit_code = svm->vmcb->control.exit_code; @@ -1482,38 +1490,38 @@ static int nested_svm_exit_handled_real(struct vcpu_svm *svm, switch (exit_code) { case SVM_EXIT_READ_CR0 ... SVM_EXIT_READ_CR8: { u32 cr_bits = 1 << (exit_code - SVM_EXIT_READ_CR0); - if (nested_vmcb->control.intercept_cr_read & cr_bits) + if (svm->nested.intercept_cr_read & cr_bits) return 1; break; } case SVM_EXIT_WRITE_CR0 ... SVM_EXIT_WRITE_CR8: { u32 cr_bits = 1 << (exit_code - SVM_EXIT_WRITE_CR0); - if (nested_vmcb->control.intercept_cr_write & cr_bits) + if (svm->nested.intercept_cr_write & cr_bits) return 1; break; } case SVM_EXIT_READ_DR0 ... SVM_EXIT_READ_DR7: { u32 dr_bits = 1 << (exit_code - SVM_EXIT_READ_DR0); - if (nested_vmcb->control.intercept_dr_read & dr_bits) + if (svm->nested.intercept_dr_read & dr_bits) return 1; break; } case SVM_EXIT_WRITE_DR0 ... SVM_EXIT_WRITE_DR7: { u32 dr_bits = 1 << (exit_code - SVM_EXIT_WRITE_DR0); - if (nested_vmcb->control.intercept_dr_write & dr_bits) + if (svm->nested.intercept_dr_write & dr_bits) return 1; break; } case SVM_EXIT_EXCP_BASE ... SVM_EXIT_EXCP_BASE + 0x1f: { u32 excp_bits = 1 << (exit_code - SVM_EXIT_EXCP_BASE); - if (nested_vmcb->control.intercept_exceptions & excp_bits) + if (svm->nested.intercept_exceptions & excp_bits) return 1; break; } default: { u64 exit_bits = 1ULL << (exit_code - SVM_EXIT_INTR); nsvm_printk("exit code: 0x%x\n", exit_code); - if (nested_vmcb->control.intercept & exit_bits) + if (svm->nested.intercept & exit_bits) return 1; } } @@ -1804,6 +1812,14 @@ static int nested_svm_vmrun(struct vcpu_svm *svm, void *arg1, svm->nested.vmcb_msrpm = nested_vmcb->control.msrpm_base_pa; + /* cache intercepts */ + svm->nested.intercept_cr_read = nested_vmcb->control.intercept_cr_read; + svm->nested.intercept_cr_write = nested_vmcb->control.intercept_cr_write; + svm->nested.intercept_dr_read = nested_vmcb->control.intercept_dr_read; + svm->nested.intercept_dr_write = nested_vmcb->control.intercept_dr_write; + svm->nested.intercept_exceptions = nested_vmcb->control.intercept_exceptions; + svm->nested.intercept = nested_vmcb->control.intercept; + force_new_asid(&svm->vcpu); svm->vmcb->control.exit_int_info = nested_vmcb->control.exit_int_info; svm->vmcb->control.exit_int_info_err = nested_vmcb->control.exit_int_info_err; -- To unsubscribe from this list: send the line "unsubscribe kvm-commits" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
