linux-kernel - [PATCH v2 23/46] KVM: VMX: Fold ept_update_paging_mode_cr0() back into vmx_set

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Message-Id: <20210713163324.627647-24-seanjc@google.com>
Date:   Tue, 13 Jul 2021 09:33:01 -0700
From:   Sean Christopherson <seanjc@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Reiji Watanabe <reijiw@...gle.com>
Subject: [PATCH v2 23/46] KVM: VMX: Fold ept_update_paging_mode_cr0() back
 into vmx_set_cr0()

Move the CR0/CR3/CR4 shenanigans for EPT without unrestricted guest back
into vmx_set_cr0().  This will allow a future patch to eliminate the
rather gross stuffing of vcpu->arch.cr0 in the paging transition cases
by snapshotting the old CR0.

No functional change intended.

Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 arch/x86/kvm/vmx/vmx.c | 40 +++++++++++++++++-----------------------
 1 file changed, 17 insertions(+), 23 deletions(-)

diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index ed631564c651..db70fe463aa1 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -2994,27 +2994,6 @@ void ept_save_pdptrs(struct kvm_vcpu *vcpu)
 	kvm_register_mark_dirty(vcpu, VCPU_EXREG_PDPTR);
 }
 
-static void ept_update_paging_mode_cr0(unsigned long cr0, struct kvm_vcpu *vcpu)
-{
-	struct vcpu_vmx *vmx = to_vmx(vcpu);
-
-	if (!kvm_register_is_available(vcpu, VCPU_EXREG_CR3))
-		vmx_cache_reg(vcpu, VCPU_EXREG_CR3);
-	if (!(cr0 & X86_CR0_PG)) {
-		/* From paging/starting to nonpaging */
-		exec_controls_setbit(vmx, CPU_BASED_CR3_LOAD_EXITING |
-					  CPU_BASED_CR3_STORE_EXITING);
-		vcpu->arch.cr0 = cr0;
-		vmx_set_cr4(vcpu, kvm_read_cr4(vcpu));
-	} else if (!is_paging(vcpu)) {
-		/* From nonpaging to paging */
-		exec_controls_clearbit(vmx, CPU_BASED_CR3_LOAD_EXITING |
-					    CPU_BASED_CR3_STORE_EXITING);
-		vcpu->arch.cr0 = cr0;
-		vmx_set_cr4(vcpu, kvm_read_cr4(vcpu));
-	}
-}
-
 void vmx_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
 {
 	struct vcpu_vmx *vmx = to_vmx(vcpu);
@@ -3044,8 +3023,23 @@ void vmx_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
 	}
 #endif
 
-	if (enable_ept && !is_unrestricted_guest(vcpu))
-		ept_update_paging_mode_cr0(cr0, vcpu);
+	if (enable_ept && !is_unrestricted_guest(vcpu)) {
+		if (!kvm_register_is_available(vcpu, VCPU_EXREG_CR3))
+			vmx_cache_reg(vcpu, VCPU_EXREG_CR3);
+		if (!(cr0 & X86_CR0_PG)) {
+			/* From paging/starting to nonpaging */
+			exec_controls_setbit(vmx, CPU_BASED_CR3_LOAD_EXITING |
+						  CPU_BASED_CR3_STORE_EXITING);
+			vcpu->arch.cr0 = cr0;
+			vmx_set_cr4(vcpu, kvm_read_cr4(vcpu));
+		} else if (!is_paging(vcpu)) {
+			/* From nonpaging to paging */
+			exec_controls_clearbit(vmx, CPU_BASED_CR3_LOAD_EXITING |
+						    CPU_BASED_CR3_STORE_EXITING);
+			vcpu->arch.cr0 = cr0;
+			vmx_set_cr4(vcpu, kvm_read_cr4(vcpu));
+		}
+	}
 
 	vmcs_writel(CR0_READ_SHADOW, cr0);
 	vmcs_writel(GUEST_CR0, hw_cr0);
-- 
2.32.0.93.g670b81a890-goog