[41/54] KVM: x86/mmu: Consolidate reset_rsvds_bits_mask() calls

Commit Message

Sean Christopherson June 22, 2021, 5:57 p.m. UTC

Move calls to reset_rsvds_bits_mask() out of the various mode statements
and under a more generic !CR0.PG check.  This will allow for additional
code consolidation in the future.

No functional change intended.

Signed-off-by: Sean Christopherson <[e-mail]>
---
 arch/x86/kvm/mmu/mmu.c | 21 ++++++++++-----------
 1 file changed, 10 insertions(+), 11 deletions(-)

Comments

Paolo Bonzini June 23, 2021, 8:07 p.m. UTC | #1

On 22/06/21 19:57, Sean Christopherson wrote:
> Move calls to reset_rsvds_bits_mask() out of the various mode statements
> and under a more generic !CR0.PG check

CR0.PG=1, not =0.

Paolo

Sean Christopherson June 23, 2021, 8:53 p.m. UTC | #2

On Wed, Jun 23, 2021, Paolo Bonzini wrote:
> On 22/06/21 19:57, Sean Christopherson wrote:
> > Move calls to reset_rsvds_bits_mask() out of the various mode statements
> > and under a more generic !CR0.PG check
> 
> CR0.PG=1, not =0.

It's always some mundane detail!

Patch

diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 30557b3e5c37..52311c2efd5d 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -4637,18 +4637,18 @@  static void init_kvm_tdp_mmu(struct kvm_vcpu *vcpu)
 	} else if (is_long_mode(vcpu)) {
 		context->root_level = ____is_cr4_la57(&regs) ?
 				PT64_ROOT_5LEVEL : PT64_ROOT_4LEVEL;
-		reset_rsvds_bits_mask(vcpu, context);
 		context->gva_to_gpa = paging64_gva_to_gpa;
 	} else if (is_pae(vcpu)) {
 		context->root_level = PT32E_ROOT_LEVEL;
-		reset_rsvds_bits_mask(vcpu, context);
 		context->gva_to_gpa = paging64_gva_to_gpa;
 	} else {
 		context->root_level = PT32_ROOT_LEVEL;
-		reset_rsvds_bits_mask(vcpu, context);
 		context->gva_to_gpa = paging32_gva_to_gpa;
 	}
 
+	if (is_cr0_pg(context))
+		reset_rsvds_bits_mask(vcpu, context);
+
 	update_permission_bitmask(context, false);
 	update_pkru_bitmask(context);
 	update_last_nonleaf_level(context);
@@ -4890,18 +4890,17 @@  static void init_kvm_nested_mmu(struct kvm_vcpu *vcpu)
 	 * nested page tables as the second level of translation. Basically
 	 * the gva_to_gpa functions between mmu and nested_mmu are swapped.
 	 */
-	if (!is_paging(vcpu)) {
+	if (!is_paging(vcpu))
 		g_context->gva_to_gpa = nonpaging_gva_to_gpa_nested;
-	} else if (is_long_mode(vcpu)) {
-		reset_rsvds_bits_mask(vcpu, g_context);
+	else if (is_long_mode(vcpu))
 		g_context->gva_to_gpa = paging64_gva_to_gpa_nested;
-	} else if (is_pae(vcpu)) {
-		reset_rsvds_bits_mask(vcpu, g_context);
+	else if (is_pae(vcpu))
 		g_context->gva_to_gpa = paging64_gva_to_gpa_nested;
-	} else {
-		reset_rsvds_bits_mask(vcpu, g_context);
+	else
 		g_context->gva_to_gpa = paging32_gva_to_gpa_nested;
-	}
+
+	if (is_cr0_pg(g_context))
+		reset_rsvds_bits_mask(vcpu, g_context);
 
 	update_permission_bitmask(g_context, false);
 	update_pkru_bitmask(g_context);