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Subject[RFC PATCH v2 35/69] KVM: x86: Introduce vm_teardown() hook in kvm_arch_vm_destroy()
Date
From: Sean Christopherson <sean.j.christopherson@intel.com>

Add a second kvm_x86_ops hook in kvm_arch_vm_destroy() to support TDX's
destruction path, which needs to first put the VM into a teardown state,
then free per-vCPU resource, and finally free per-VM resources.

Note, this knowingly creates a discrepancy in nomenclature for SVM as
svm_vm_teardown() invokes avic_vm_destroy() and sev_vm_destroy().
Moving the now-misnamed functions or renaming them is left to a future
patch so as not to introduce a functional change for SVM.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
---
arch/x86/include/asm/kvm-x86-ops.h | 1 +
arch/x86/include/asm/kvm_host.h | 1 +
arch/x86/kvm/svm/svm.c | 8 +++++++-
arch/x86/kvm/vmx/vmx.c | 12 ++++++++++++
arch/x86/kvm/x86.c | 3 ++-
5 files changed, 23 insertions(+), 2 deletions(-)

diff --git a/arch/x86/include/asm/kvm-x86-ops.h b/arch/x86/include/asm/kvm-x86-ops.h
index 01457da0162b..95ae4a71cfbc 100644
--- a/arch/x86/include/asm/kvm-x86-ops.h
+++ b/arch/x86/include/asm/kvm-x86-ops.h
@@ -20,6 +20,7 @@ KVM_X86_OP(has_emulated_msr)
KVM_X86_OP(vcpu_after_set_cpuid)
KVM_X86_OP(is_vm_type_supported)
KVM_X86_OP(vm_init)
+KVM_X86_OP(vm_teardown)
KVM_X86_OP_NULL(vm_destroy)
KVM_X86_OP(vcpu_create)
KVM_X86_OP(vcpu_free)
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index e3abf077f328..96e6cd95d884 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1217,6 +1217,7 @@ struct kvm_x86_ops {
bool (*is_vm_type_supported)(unsigned long vm_type);
unsigned int vm_size;
int (*vm_init)(struct kvm *kvm);
+ void (*vm_teardown)(struct kvm *kvm);
void (*vm_destroy)(struct kvm *kvm);

/* Create, but do not attach this VCPU */
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 286a49b09269..bcc3fc4872a3 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -4416,12 +4416,17 @@ static void svm_vcpu_deliver_sipi_vector(struct kvm_vcpu *vcpu, u8 vector)
sev_vcpu_deliver_sipi_vector(vcpu, vector);
}

-static void svm_vm_destroy(struct kvm *kvm)
+static void svm_vm_teardown(struct kvm *kvm)
{
avic_vm_destroy(kvm);
sev_vm_destroy(kvm);
}

+static void svm_vm_destroy(struct kvm *kvm)
+{
+
+}
+
static bool svm_is_vm_type_supported(unsigned long type)
{
return type == KVM_X86_LEGACY_VM;
@@ -4456,6 +4461,7 @@ static struct kvm_x86_ops svm_x86_ops __initdata = {
.is_vm_type_supported = svm_is_vm_type_supported,
.vm_size = sizeof(struct kvm_svm),
.vm_init = svm_vm_init,
+ .vm_teardown = svm_vm_teardown,
.vm_destroy = svm_vm_destroy,

.prepare_guest_switch = svm_prepare_guest_switch,
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 84c2df824ecc..36756a356704 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -6995,6 +6995,16 @@ static int vmx_vm_init(struct kvm *kvm)
return 0;
}

+static void vmx_vm_teardown(struct kvm *kvm)
+{
+
+}
+
+static void vmx_vm_destroy(struct kvm *kvm)
+{
+
+}
+
static int __init vmx_check_processor_compat(void)
{
struct vmcs_config vmcs_conf;
@@ -7613,6 +7623,8 @@ static struct kvm_x86_ops vmx_x86_ops __initdata = {
.is_vm_type_supported = vmx_is_vm_type_supported,
.vm_size = sizeof(struct kvm_vmx),
.vm_init = vmx_vm_init,
+ .vm_teardown = vmx_vm_teardown,
+ .vm_destroy = vmx_vm_destroy,

.vcpu_create = vmx_create_vcpu,
.vcpu_free = vmx_free_vcpu,
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index da9f1081cb03..4b436cae1732 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -11043,7 +11043,7 @@ void kvm_arch_destroy_vm(struct kvm *kvm)
__x86_set_memory_region(kvm, TSS_PRIVATE_MEMSLOT, 0, 0);
mutex_unlock(&kvm->slots_lock);
}
- static_call_cond(kvm_x86_vm_destroy)(kvm);
+ static_call(kvm_x86_vm_teardown)(kvm);
kvm_free_msr_filter(srcu_dereference_check(kvm->arch.msr_filter, &kvm->srcu, 1));
kvm_pic_destroy(kvm);
kvm_ioapic_destroy(kvm);
@@ -11054,6 +11054,7 @@ void kvm_arch_destroy_vm(struct kvm *kvm)
kvm_page_track_cleanup(kvm);
kvm_xen_destroy_vm(kvm);
kvm_hv_destroy_vm(kvm);
+ static_call_cond(kvm_x86_vm_destroy)(kvm);
}

void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *slot)
--
2.25.1
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