[PATCH v4 03/26] KVM: x86: Move check_processor_compatibility from init ops to runtime ops

[isaku . yamahata]

From: Chao Gao <chao.gao@xxxxxxxxx>

so that KVM can do compatibility checks on hotplugged CPUs. Drop __init
from check_processor_compatibility() and its callees.

use a static_call() to invoke .check_processor_compatibility.

Opportunistically rename {svm,vmx}_check_processor_compat to conform
to the naming convention of fields of kvm_x86_ops.

Signed-off-by: Chao Gao <chao.gao@xxxxxxxxx>
Reviewed-by: Sean Christopherson <seanjc@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20220216031528.92558-2-chao.gao@xxxxxxxxx
Signed-off-by: Isaku Yamahata <isaku.yamahata@xxxxxxxxx>
Reviewed-by: Yuan Yao <yuan.yao@xxxxxxxxx>
---
 arch/x86/include/asm/kvm-x86-ops.h |  1 +
 arch/x86/include/asm/kvm_host.h    |  2 +-
 arch/x86/kvm/svm/svm.c             |  4 ++--
 arch/x86/kvm/vmx/vmx.c             | 14 +++++++-------
 arch/x86/kvm/x86.c                 |  3 +--
 5 files changed, 12 insertions(+), 12 deletions(-)

diff --git a/arch/x86/include/asm/kvm-x86-ops.h b/arch/x86/include/asm/kvm-x86-ops.h
index 51f777071584..3bc45932e2d1 100644
--- a/arch/x86/include/asm/kvm-x86-ops.h
+++ b/arch/x86/include/asm/kvm-x86-ops.h
@@ -129,6 +129,7 @@ KVM_X86_OP(msr_filter_changed)
 KVM_X86_OP(complete_emulated_msr)
 KVM_X86_OP(vcpu_deliver_sipi_vector)
 KVM_X86_OP_OPTIONAL_RET0(vcpu_get_apicv_inhibit_reasons);
+KVM_X86_OP(check_processor_compatibility)
 
 #undef KVM_X86_OP
 #undef KVM_X86_OP_OPTIONAL
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 2c96c43c313a..5df5d88d345f 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1445,6 +1445,7 @@ static inline u16 kvm_lapic_irq_dest_mode(bool dest_mode_logical)
 struct kvm_x86_ops {
 	const char *name;
 
+	int (*check_processor_compatibility)(void);
 	int (*hardware_enable)(void);
 	void (*hardware_disable)(void);
 	void (*hardware_unsetup)(void);
@@ -1655,7 +1656,6 @@ struct kvm_x86_nested_ops {
 struct kvm_x86_init_ops {
 	int (*cpu_has_kvm_support)(void);
 	int (*disabled_by_bios)(void);
-	int (*check_processor_compatibility)(void);
 	int (*hardware_setup)(void);
 	unsigned int (*handle_intel_pt_intr)(void);
 
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index f3813dbacb9f..371300f03f55 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -4134,7 +4134,7 @@ svm_patch_hypercall(struct kvm_vcpu *vcpu, unsigned char *hypercall)
 	hypercall[2] = 0xd9;
 }
 
-static int __init svm_check_processor_compat(void)
+static int svm_check_processor_compatibility(void)
 {
 	return 0;
 }
@@ -4740,6 +4740,7 @@ static struct kvm_x86_ops svm_x86_ops __initdata = {
 	.name = "kvm_amd",
 
 	.hardware_unsetup = svm_hardware_unsetup,
+	.check_processor_compatibility = svm_check_processor_compatibility,
 	.hardware_enable = svm_hardware_enable,
 	.hardware_disable = svm_hardware_disable,
 	.has_emulated_msr = svm_has_emulated_msr,
@@ -5122,7 +5123,6 @@ static struct kvm_x86_init_ops svm_init_ops __initdata = {
 	.cpu_has_kvm_support = has_svm,
 	.disabled_by_bios = is_disabled,
 	.hardware_setup = svm_hardware_setup,
-	.check_processor_compatibility = svm_check_processor_compat,
 
 	.runtime_ops = &svm_x86_ops,
 	.pmu_ops = &amd_pmu_ops,
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index d7f8331d6f7e..3cf7f18a4115 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -2495,8 +2495,8 @@ static bool cpu_has_sgx(void)
 	return cpuid_eax(0) >= 0x12 && (cpuid_eax(0x12) & BIT(0));
 }
 
-static __init int adjust_vmx_controls(u32 ctl_min, u32 ctl_opt,
-				      u32 msr, u32 *result)
+static int adjust_vmx_controls(u32 ctl_min, u32 ctl_opt,
+			       u32 msr, u32 *result)
 {
 	u32 vmx_msr_low, vmx_msr_high;
 	u32 ctl = ctl_min | ctl_opt;
@@ -2514,7 +2514,7 @@ static __init int adjust_vmx_controls(u32 ctl_min, u32 ctl_opt,
 	return 0;
 }
 
-static __init u64 adjust_vmx_controls64(u64 ctl_opt, u32 msr)
+static u64 adjust_vmx_controls64(u64 ctl_opt, u32 msr)
 {
 	u64 allowed;
 
@@ -2523,8 +2523,8 @@ static __init u64 adjust_vmx_controls64(u64 ctl_opt, u32 msr)
 	return  ctl_opt & allowed;
 }
 
-static __init int setup_vmcs_config(struct vmcs_config *vmcs_conf,
-				    struct vmx_capability *vmx_cap)
+static int setup_vmcs_config(struct vmcs_config *vmcs_conf,
+			     struct vmx_capability *vmx_cap)
 {
 	u32 vmx_msr_low, vmx_msr_high;
 	u32 min, opt, min2, opt2;
@@ -7417,7 +7417,7 @@ static int vmx_vm_init(struct kvm *kvm)
 	return 0;
 }
 
-static int __init vmx_check_processor_compat(void)
+static int vmx_check_processor_compatibility(void)
 {
 	struct vmcs_config vmcs_conf;
 	struct vmx_capability vmx_cap;
@@ -8015,6 +8015,7 @@ static struct kvm_x86_ops vmx_x86_ops __initdata = {
 
 	.hardware_unsetup = vmx_hardware_unsetup,
 
+	.check_processor_compatibility = vmx_check_processor_compatibility,
 	.hardware_enable = vmx_hardware_enable,
 	.hardware_disable = vmx_hardware_disable,
 	.has_emulated_msr = vmx_has_emulated_msr,
@@ -8404,7 +8405,6 @@ static __init int hardware_setup(void)
 static struct kvm_x86_init_ops vmx_init_ops __initdata = {
 	.cpu_has_kvm_support = cpu_has_kvm_support,
 	.disabled_by_bios = vmx_disabled_by_bios,
-	.check_processor_compatibility = vmx_check_processor_compat,
 	.hardware_setup = hardware_setup,
 	.handle_intel_pt_intr = NULL,
 
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 0368eab6a7b5..a7fa55ba344d 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -12001,7 +12001,6 @@ void kvm_arch_hardware_unsetup(void)
 int kvm_arch_check_processor_compat(void *opaque)
 {
 	struct cpuinfo_x86 *c = &cpu_data(smp_processor_id());
-	struct kvm_x86_init_ops *ops = opaque;
 
 	WARN_ON(!irqs_disabled());
 
@@ -12009,7 +12008,7 @@ int kvm_arch_check_processor_compat(void *opaque)
 	    __cr4_reserved_bits(cpu_has, &boot_cpu_data))
 		return -EIO;
 
-	return ops->check_processor_compatibility();
+	return static_call(kvm_x86_check_processor_compatibility)();
 }
 
 bool kvm_vcpu_is_reset_bsp(struct kvm_vcpu *vcpu)
-- 
2.25.1