[PATCH v3 1/5] KVM: x86: Move check_processor_compatibility from init ops to runtime ops

Chao Gao
2022-02-09T07:41:43Z

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@intel.com>
---
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/evmcs.c | 2 +-
arch/x86/kvm/vmx/evmcs.h | 2 +-
arch/x86/kvm/vmx/vmx.c | 12 ++++++------
arch/x86/kvm/x86.c | 3 +--
7 files changed, 13 insertions(+), 13 deletions(-)

diff --git a/arch/x86/include/asm/kvm-x86-ops.h b/arch/x86/include/asm/kvm-x86-ops.h
index 9e37dc3d8863..08494f172e2e 100644
--- a/arch/x86/include/asm/kvm-x86-ops.h
+++ b/arch/x86/include/asm/kvm-x86-ops.h
@@ -125,6 +125,7 @@ KVM_X86_OP_NULL(migrate_timers)
KVM_X86_OP(msr_filter_changed)
KVM_X86_OP_NULL(complete_emulated_msr)
KVM_X86_OP(vcpu_deliver_sipi_vector)
+KVM_X86_OP(check_processor_compatibility)

#undef KVM_X86_OP
#undef KVM_X86_OP_NULL
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index c371ee7e45f7..f65ccb5597bc 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1314,6 +1314,7 @@ 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);
@@ -1518,7 +1519,6 @@ 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);

struct kvm_x86_ops *runtime_ops;
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 975be872cd1a..df20d50526ce 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -3858,7 +3858,7 @@ 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;
}
@@ -4468,6 +4468,7 @@ 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,
.cpu_has_accelerated_tpr = svm_cpu_has_accelerated_tpr,
@@ -4839,7 +4840,6 @@ 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,
};
diff --git a/arch/x86/kvm/vmx/evmcs.c b/arch/x86/kvm/vmx/evmcs.c
index 87e3dc10edf4..a2a4c87d0558 100644
--- a/arch/x86/kvm/vmx/evmcs.c
+++ b/arch/x86/kvm/vmx/evmcs.c
@@ -295,7 +295,7 @@ const struct evmcs_field vmcs_field_to_evmcs_1[] = {
const unsigned int nr_evmcs_1_fields = ARRAY_SIZE(vmcs_field_to_evmcs_1);

#if IS_ENABLED(CONFIG_HYPERV)
-__init void evmcs_sanitize_exec_ctrls(struct vmcs_config *vmcs_conf)
+void evmcs_sanitize_exec_ctrls(struct vmcs_config *vmcs_conf)
{
vmcs_conf->pin_based_exec_ctrl &= ~EVMCS1_UNSUPPORTED_PINCTRL;
vmcs_conf->cpu_based_2nd_exec_ctrl &= ~EVMCS1_UNSUPPORTED_2NDEXEC;
diff --git a/arch/x86/kvm/vmx/evmcs.h b/arch/x86/kvm/vmx/evmcs.h
index 8d70f9aea94b..3fd4cc44d8ad 100644
--- a/arch/x86/kvm/vmx/evmcs.h
+++ b/arch/x86/kvm/vmx/evmcs.h
@@ -211,7 +211,7 @@ static inline void evmcs_load(u64 phys_addr)
vp_ap->enlighten_vmentry = 1;
}

-__init void evmcs_sanitize_exec_ctrls(struct vmcs_config *vmcs_conf);
+void evmcs_sanitize_exec_ctrls(struct vmcs_config *vmcs_conf);
#else /* !IS_ENABLED(CONFIG_HYPERV) */
static __always_inline void evmcs_write64(unsigned long field, u64 value) {}
static inline void evmcs_write32(unsigned long field, u32 value) {}
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 8ac5a6fa7720..fc94d7139f69 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -2403,8 +2403,8 @@ 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;
@@ -2422,8 +2422,8 @@ static __init int adjust_vmx_controls(u32 ctl_min, u32 ctl_opt,
return 0;
}

-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;
@@ -7116,7 +7116,7 @@ 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;
@@ -7709,6 +7709,7 @@ 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,
.cpu_has_accelerated_tpr = vmx_cpu_has_accelerated_tpr,
@@ -8043,7 +8044,6 @@ 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,

.runtime_ops = &vmx_x86_ops,
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 6f69f3e3635e..b71549a52ae0 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -11551,7 +11551,6 @@ 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());

@@ -11559,7 +11558,7 @@ 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