diff mbox series

[v4,3/7] nSVM: rename nested_load_control_from_vmcb12 in nested_copy_vmcb_control_to_cache

Message ID 20211103115230.720154-4-eesposit@redhat.com (mailing list archive)
State New, archived
Headers show
Series KVM: nSVM: avoid TOC/TOU race when checking vmcb12 | expand

Commit Message

Emanuele Giuseppe Esposito Nov. 3, 2021, 11:52 a.m. UTC 
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.

_nested_copy_vmcb_control_to_cache() works with vmcb_control_area
parameters and it will be useful in next patches, when we use
local variables instead of svm cached state.

Signed-off-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
---
 arch/x86/kvm/svm/nested.c | 80 +++++++++++++++++++--------------------
 arch/x86/kvm/svm/svm.c    |  2 +-
 arch/x86/kvm/svm/svm.h    |  2 +-
 3 files changed, 42 insertions(+), 42 deletions(-)
diff mbox series

Patch

diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c
index b974b0edd9b5..c04f8750e1f7 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)
 {
 	/*
@@ -302,15 +271,46 @@  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)
+static
+void _nested_copy_vmcb_control_to_cache(struct vmcb_control_area *to,
+					struct vmcb_control_area *from)
 {
-	copy_vmcb_control_area(&svm->nested.ctl, control);
+	unsigned int i;
+
+	for (i = 0; i < MAX_INTERCEPT; i++)
+		to->intercepts[i] = from->intercepts[i];
+
+	to->iopm_base_pa        = from->iopm_base_pa;
+	to->msrpm_base_pa       = from->msrpm_base_pa;
+	to->tsc_offset          = from->tsc_offset;
+	to->tlb_ctl             = from->tlb_ctl;
+	to->int_ctl             = from->int_ctl;
+	to->int_vector          = from->int_vector;
+	to->int_state           = from->int_state;
+	to->exit_code           = from->exit_code;
+	to->exit_code_hi        = from->exit_code_hi;
+	to->exit_info_1         = from->exit_info_1;
+	to->exit_info_2         = from->exit_info_2;
+	to->exit_int_info       = from->exit_int_info;
+	to->exit_int_info_err   = from->exit_int_info_err;
+	to->nested_ctl          = from->nested_ctl;
+	to->event_inj           = from->event_inj;
+	to->event_inj_err       = from->event_inj_err;
+	to->nested_cr3          = from->nested_cr3;
+	to->virt_ext            = from->virt_ext;
+	to->pause_filter_count  = from->pause_filter_count;
+	to->pause_filter_thresh = from->pause_filter_thresh;
+
+	/* Copy asid here because nested_vmcb_check_controls will check it.  */
+	to->asid           = from->asid;
+	to->msrpm_base_pa &= ~0x0fffULL;
+	to->iopm_base_pa  &= ~0x0fffULL;
+}
 
-	/* Copy it here because nested_svm_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;
+void nested_copy_vmcb_control_to_cache(struct vcpu_svm *svm,
+				       struct vmcb_control_area *control)
+{
+	_nested_copy_vmcb_control_to_cache(&svm->nested.ctl, control);
 }
 
 static void _nested_copy_vmcb_save_to_cache(struct vmcb_save_area_cached *to,
@@ -670,7 +670,7 @@  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) ||
@@ -1406,7 +1406,7 @@  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);
 
 	svm_switch_vmcb(svm, &svm->nested.vmcb02);
 	nested_vmcb02_prepare_control(svm);
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 6565a3efabd1..4e586ce77591 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -4377,7 +4377,7 @@  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, false);
 
diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h
index 09621f4891f8..4346f6053432 100644
--- a/arch/x86/kvm/svm/svm.h
+++ b/arch/x86/kvm/svm/svm.h
@@ -497,7 +497,7 @@  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);