linux-kernel - [PATCH 3/7] KVM: x86: add .complete_mmu

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Date:   Wed, 17 Feb 2021 16:57:14 +0200
From:   Maxim Levitsky <mlevitsk@...hat.com>
To:     kvm@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Wanpeng Li <wanpengli@...cent.com>,
        Borislav Petkov <bp@...en8.de>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Joerg Roedel <joro@...tes.org>,
        Jim Mattson <jmattson@...gle.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Sean Christopherson <seanjc@...gle.com>,
        x86@...nel.org (maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)),
        Thomas Gleixner <tglx@...utronix.de>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Ingo Molnar <mingo@...hat.com>,
        Maxim Levitsky <mlevitsk@...hat.com>
Subject: [PATCH 3/7] KVM: x86: add .complete_mmu_init arch callback

This callback will be used to tweak the mmu context
in arch specific code after it was reset.

Signed-off-by: Maxim Levitsky <mlevitsk@...hat.com>
---
 arch/x86/include/asm/kvm-x86-ops.h | 1 +
 arch/x86/include/asm/kvm_host.h    | 2 ++
 arch/x86/kvm/mmu/mmu.c             | 2 ++
 arch/x86/kvm/svm/svm.c             | 6 ++++++
 arch/x86/kvm/vmx/vmx.c             | 6 ++++++
 5 files changed, 17 insertions(+)

diff --git a/arch/x86/include/asm/kvm-x86-ops.h b/arch/x86/include/asm/kvm-x86-ops.h
index 355a2ab8fc09..041e5765dc67 100644
--- a/arch/x86/include/asm/kvm-x86-ops.h
+++ b/arch/x86/include/asm/kvm-x86-ops.h
@@ -86,6 +86,7 @@ KVM_X86_OP(set_tss_addr)
 KVM_X86_OP(set_identity_map_addr)
 KVM_X86_OP(get_mt_mask)
 KVM_X86_OP(load_mmu_pgd)
+KVM_X86_OP(complete_mmu_init)
 KVM_X86_OP_NULL(has_wbinvd_exit)
 KVM_X86_OP(write_l1_tsc_offset)
 KVM_X86_OP(get_exit_info)
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index a8e1b57b1532..01a08f936781 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1251,6 +1251,8 @@ struct kvm_x86_ops {
 	void (*load_mmu_pgd)(struct kvm_vcpu *vcpu, unsigned long pgd,
 			     int pgd_level);
 
+	void (*complete_mmu_init) (struct kvm_vcpu *vcpu);
+
 	bool (*has_wbinvd_exit)(void);
 
 	/* Returns actual tsc_offset set in active VMCS */
diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index e507568cd55d..00bf9ff2e469 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -4774,6 +4774,8 @@ void kvm_init_mmu(struct kvm_vcpu *vcpu, bool reset_roots)
 		init_kvm_tdp_mmu(vcpu);
 	else
 		init_kvm_softmmu(vcpu);
+
+	static_call(kvm_x86_complete_mmu_init)(vcpu);
 }
 EXPORT_SYMBOL_GPL(kvm_init_mmu);
 
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 754e07538b4a..74a334c9902a 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -3913,6 +3913,11 @@ static void svm_load_mmu_pgd(struct kvm_vcpu *vcpu, unsigned long root,
 	vmcb_mark_dirty(svm->vmcb, VMCB_CR);
 }
 
+static void svm_complete_mmu_init(struct kvm_vcpu *vcpu)
+{
+
+}
+
 static int is_disabled(void)
 {
 	u64 vm_cr;
@@ -4522,6 +4527,7 @@ static struct kvm_x86_ops svm_x86_ops __initdata = {
 	.write_l1_tsc_offset = svm_write_l1_tsc_offset,
 
 	.load_mmu_pgd = svm_load_mmu_pgd,
+	.complete_mmu_init = svm_complete_mmu_init,
 
 	.check_intercept = svm_check_intercept,
 	.handle_exit_irqoff = svm_handle_exit_irqoff,
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index e428d69e21c0..bf6ef674d688 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -3252,6 +3252,11 @@ static void vmx_load_mmu_pgd(struct kvm_vcpu *vcpu, unsigned long pgd,
 		vmcs_writel(GUEST_CR3, guest_cr3);
 }
 
+static void vmx_complete_mmu_init(struct kvm_vcpu *vcpu)
+{
+
+}
+
 static bool vmx_is_valid_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
 {
 	/*
@@ -7849,6 +7854,7 @@ static struct kvm_x86_ops vmx_x86_ops __initdata = {
 	.write_l1_tsc_offset = vmx_write_l1_tsc_offset,
 
 	.load_mmu_pgd = vmx_load_mmu_pgd,
+	.complete_mmu_init = vmx_complete_mmu_init,
 
 	.check_intercept = vmx_check_intercept,
 	.handle_exit_irqoff = vmx_handle_exit_irqoff,
-- 
2.26.2