Re: [PATCH v3 3/8] nSVM: rename nested_load_control_from_vmcb12 in nested_copy_vmcb_control_to_cache

Maxim Levitsky
2021-10-22T14:46:49Z

On Mon, 2021-10-11 at 10:36 -0400, Emanuele Giuseppe Esposito wrote:
> Following the same naming convention of the previous patch,
> rename nested_load_control_from_vmcb12.
> In addition, inline copy_vmcb_control_area as it is only called
> by this function.

>
> Signed-off-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
> ---
> arch/x86/kvm/svm/nested.c | 67 ++++++++++++++++++---------------------
> arch/x86/kvm/svm/svm.c | 2 +-
> arch/x86/kvm/svm/svm.h | 2 +-
> 3 files changed, 32 insertions(+), 39 deletions(-)
>
> diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c
> index c4959da8aec0..f6030a202bc5 100644
> --- a/arch/x86/kvm/svm/nested.c
> +++ b/arch/x86/kvm/svm/nested.c
> @@ -163,37 +163,6 @@ void recalc_intercepts(struct vcpu_svm *svm)
> vmcb_set_intercept(c, INTERCEPT_VMSAVE);
> }
>
> -static void copy_vmcb_control_area(struct vmcb_control_area *dst,
> - struct vmcb_control_area *from)
> -{
> - unsigned int i;
> -
> - for (i = 0; i < MAX_INTERCEPT; i++)
> - dst->intercepts[i] = from->intercepts[i];
> -
> - dst->iopm_base_pa = from->iopm_base_pa;
> - dst->msrpm_base_pa = from->msrpm_base_pa;
> - dst->tsc_offset = from->tsc_offset;
> - /* asid not copied, it is handled manually for svm->vmcb. */
> - dst->tlb_ctl = from->tlb_ctl;
> - dst->int_ctl = from->int_ctl;
> - dst->int_vector = from->int_vector;
> - dst->int_state = from->int_state;
> - dst->exit_code = from->exit_code;
> - dst->exit_code_hi = from->exit_code_hi;
> - dst->exit_info_1 = from->exit_info_1;
> - dst->exit_info_2 = from->exit_info_2;
> - dst->exit_int_info = from->exit_int_info;
> - dst->exit_int_info_err = from->exit_int_info_err;
> - dst->nested_ctl = from->nested_ctl;
> - dst->event_inj = from->event_inj;
> - dst->event_inj_err = from->event_inj_err;
> - dst->nested_cr3 = from->nested_cr3;
> - dst->virt_ext = from->virt_ext;
> - dst->pause_filter_count = from->pause_filter_count;
> - dst->pause_filter_thresh = from->pause_filter_thresh;
> -}
> -
> static bool nested_svm_vmrun_msrpm(struct vcpu_svm *svm)
> {
> /*
> @@ -302,12 +271,36 @@ static bool nested_vmcb_valid_sregs(struct kvm_vcpu *vcpu,
> return true;
> }
>
> -void nested_load_control_from_vmcb12(struct vcpu_svm *svm,
> - struct vmcb_control_area *control)
> +void nested_copy_vmcb_control_to_cache(struct vcpu_svm *svm,
> + struct vmcb_control_area *control)
> {
> - copy_vmcb_control_area(&svm->nested.ctl, control);
> + unsigned int i;
>
> - /* Copy it here because nested_svm_check_controls will check it. */
> + for (i = 0; i < MAX_INTERCEPT; i++)
> + svm->nested.ctl.intercepts[i] = control->intercepts[i];
> +
> + svm->nested.ctl.iopm_base_pa = control->iopm_base_pa;
> + svm->nested.ctl.msrpm_base_pa = control->msrpm_base_pa;
> + svm->nested.ctl.tsc_offset = control->tsc_offset;
> + svm->nested.ctl.tlb_ctl = control->tlb_ctl;
> + svm->nested.ctl.int_ctl = control->int_ctl;
> + svm->nested.ctl.int_vector = control->int_vector;
> + svm->nested.ctl.int_state = control->int_state;
> + svm->nested.ctl.exit_code = control->exit_code;
> + svm->nested.ctl.exit_code_hi = control->exit_code_hi;
> + svm->nested.ctl.exit_info_1 = control->exit_info_1;
> + svm->nested.ctl.exit_info_2 = control->exit_info_2;
> + svm->nested.ctl.exit_int_info = control->exit_int_info;
> + svm->nested.ctl.exit_int_info_err = control->exit_int_info_err;
> + svm->nested.ctl.nested_ctl = control->nested_ctl;
> + svm->nested.ctl.event_inj = control->event_inj;
> + svm->nested.ctl.event_inj_err = control->event_inj_err;
> + svm->nested.ctl.nested_cr3 = control->nested_cr3;
> + svm->nested.ctl.virt_ext = control->virt_ext;
> + svm->nested.ctl.pause_filter_count = control->pause_filter_count;
> + svm->nested.ctl.pause_filter_thresh = control->pause_filter_thresh;
> +
> + /* Copy asid here because nested_vmcb_check_controls will check it. */
> svm->nested.ctl.asid = control->asid;
> svm->nested.ctl.msrpm_base_pa &= ~0x0fffULL;
> svm->nested.ctl.iopm_base_pa &= ~0x0fffULL;
> @@ -662,7 +655,7 @@ int nested_svm_vmrun(struct kvm_vcpu *vcpu)
> if (WARN_ON_ONCE(!svm->nested.initialized))
> return -EINVAL;
>
> - nested_load_control_from_vmcb12(svm, &vmcb12->control);
> + nested_copy_vmcb_control_to_cache(svm, &vmcb12->control);
> nested_copy_vmcb_save_to_cache(svm, &vmcb12->save);
>
> if (!nested_vmcb_valid_sregs(vcpu, &vmcb12->save) ||
> @@ -1401,7 +1394,7 @@ static int svm_set_nested_state(struct kvm_vcpu *vcpu,
> svm->nested.vmcb12_gpa = kvm_state->hdr.svm.vmcb_pa;
>
> svm_copy_vmrun_state(&svm->vmcb01.ptr->save, save);
> - nested_load_control_from_vmcb12(svm, ctl);
> + nested_copy_vmcb_control_to_cache(svm, ctl);
> nested_copy_vmcb_save_to_cache(svm, save);
>
> svm_switch_vmcb(svm, &svm->nested.vmcb02);
> diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
> index bf171f5f6158..1b6d25c6e0ae 100644
> --- a/arch/x86/kvm/svm/svm.c
> +++ b/arch/x86/kvm/svm/svm.c
> @@ -4385,7 +4385,7 @@ static int svm_leave_smm(struct kvm_vcpu *vcpu, const char *smstate)
>
> vmcb12 = map.hva;
>
> - nested_load_control_from_vmcb12(svm, &vmcb12->control);
> + nested_copy_vmcb_control_to_cache(svm, &vmcb12->control);
> nested_copy_vmcb_save_to_cache(svm, &vmcb12->save);
>
> ret = enter_svm_guest_mode(vcpu, vmcb12_gpa, vmcb12);
> diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h
> index f0195bc263e9..3c950aeca646 100644
> --- a/arch/x86/kvm/svm/svm.h
> +++ b/arch/x86/kvm/svm/svm.h
> @@ -496,7 +496,7 @@ int nested_svm_check_permissions(struct kvm_vcpu *vcpu);
> int nested_svm_check_exception(struct vcpu_svm *svm, unsigned nr,
> bool has_error_code, u32 error_code);
> int nested_svm_exit_special(struct vcpu_svm *svm);
> -void nested_load_control_from_vmcb12(struct vcpu_svm *svm,
> +void nested_copy_vmcb_control_to_cache(struct vcpu_svm *svm,
> struct vmcb_control_area *control);
> void nested_copy_vmcb_save_to_cache(struct vcpu_svm *svm,
> struct vmcb_save_area *save);

Looks great!

Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>

Best regards,
Maxim Levitsky