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Subject[PATCH v3 2/9] KVM: x86: Move init-only kvm_x86_ops to separate struct
Date
Move the kvm_x86_ops functions that are used only within the scope of
kvm_init() into a separate struct, kvm_x86_init_ops. In addition to
identifying the init-only functions without restorting to code comments,
this also sets the stage for waiting until after ->hardware_setup() to
set kvm_x86_ops. Setting kvm_x86_ops after ->hardware_setup() is
desirable as many of the hooks are not usable until ->hardware_setup()
completes.

No functional change intended.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
arch/x86/include/asm/kvm_host.h | 13 +++++++++----
arch/x86/kvm/svm.c | 15 ++++++++++-----
arch/x86/kvm/vmx/vmx.c | 16 +++++++++++-----
arch/x86/kvm/x86.c | 10 ++++++----
4 files changed, 36 insertions(+), 18 deletions(-)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 9a183e9d4cb1..f4c5b49299ff 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1054,12 +1054,8 @@ static inline u16 kvm_lapic_irq_dest_mode(bool dest_mode_logical)
}

struct kvm_x86_ops {
- int (*cpu_has_kvm_support)(void); /* __init */
- int (*disabled_by_bios)(void); /* __init */
int (*hardware_enable)(void);
void (*hardware_disable)(void);
- int (*check_processor_compatibility)(void);/* __init */
- int (*hardware_setup)(void); /* __init */
void (*hardware_unsetup)(void); /* __exit */
bool (*cpu_has_accelerated_tpr)(void);
bool (*has_emulated_msr)(int index);
@@ -1260,6 +1256,15 @@ struct kvm_x86_ops {
int (*enable_direct_tlbflush)(struct kvm_vcpu *vcpu);
};

+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;
+};
+
struct kvm_arch_async_pf {
u32 token;
gfn_t gfn;
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 2125c6ae5951..33e67c3389c2 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -7351,11 +7351,7 @@ static void svm_pre_update_apicv_exec_ctrl(struct kvm *kvm, bool activate)
}

static struct kvm_x86_ops svm_x86_ops __ro_after_init = {
- .cpu_has_kvm_support = has_svm,
- .disabled_by_bios = is_disabled,
- .hardware_setup = svm_hardware_setup,
.hardware_unsetup = svm_hardware_teardown,
- .check_processor_compatibility = svm_check_processor_compat,
.hardware_enable = svm_hardware_enable,
.hardware_disable = svm_hardware_disable,
.cpu_has_accelerated_tpr = svm_cpu_has_accelerated_tpr,
@@ -7480,9 +7476,18 @@ static struct kvm_x86_ops svm_x86_ops __ro_after_init = {
.check_nested_events = svm_check_nested_events,
};

+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,
+};
+
static int __init svm_init(void)
{
- return kvm_init(&svm_x86_ops, sizeof(struct vcpu_svm),
+ return kvm_init(&svm_init_ops, sizeof(struct vcpu_svm),
__alignof__(struct vcpu_svm), THIS_MODULE);
}

diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 07299a957d4a..ffcdcc86f5b7 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -7842,11 +7842,8 @@ static bool vmx_check_apicv_inhibit_reasons(ulong bit)
}

static struct kvm_x86_ops vmx_x86_ops __ro_after_init = {
- .cpu_has_kvm_support = cpu_has_kvm_support,
- .disabled_by_bios = vmx_disabled_by_bios,
- .hardware_setup = hardware_setup,
.hardware_unsetup = hardware_unsetup,
- .check_processor_compatibility = vmx_check_processor_compat,
+
.hardware_enable = hardware_enable,
.hardware_disable = hardware_disable,
.cpu_has_accelerated_tpr = report_flexpriority,
@@ -7981,6 +7978,15 @@ static struct kvm_x86_ops vmx_x86_ops __ro_after_init = {
.apic_init_signal_blocked = vmx_apic_init_signal_blocked,
};

+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,
+};
+
static void vmx_cleanup_l1d_flush(void)
{
if (vmx_l1d_flush_pages) {
@@ -8065,7 +8071,7 @@ static int __init vmx_init(void)
}
#endif

- r = kvm_init(&vmx_x86_ops, sizeof(struct vcpu_vmx),
+ r = kvm_init(&vmx_init_ops, sizeof(struct vcpu_vmx),
__alignof__(struct vcpu_vmx), THIS_MODULE);
if (r)
return r;
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 0f08e1b4e762..20f989d1bba8 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -7298,8 +7298,8 @@ static struct notifier_block pvclock_gtod_notifier = {

int kvm_arch_init(void *opaque)
{
+ struct kvm_x86_init_ops *ops = opaque;
int r;
- struct kvm_x86_ops *ops = opaque;

if (kvm_x86_ops) {
printk(KERN_ERR "kvm: already loaded the other module\n");
@@ -7354,7 +7354,7 @@ int kvm_arch_init(void *opaque)
if (r)
goto out_free_percpu;

- kvm_x86_ops = ops;
+ kvm_x86_ops = ops->runtime_ops;

kvm_mmu_set_mask_ptes(PT_USER_MASK, PT_ACCESSED_MASK,
PT_DIRTY_MASK, PT64_NX_MASK, 0,
@@ -9623,6 +9623,7 @@ void kvm_arch_hardware_disable(void)

int kvm_arch_hardware_setup(void *opaque)
{
+ struct kvm_x86_init_ops *ops = opaque;
int r;

rdmsrl_safe(MSR_EFER, &host_efer);
@@ -9630,7 +9631,7 @@ int kvm_arch_hardware_setup(void *opaque)
if (boot_cpu_has(X86_FEATURE_XSAVES))
rdmsrl(MSR_IA32_XSS, host_xss);

- r = kvm_x86_ops->hardware_setup();
+ r = ops->hardware_setup();
if (r != 0)
return r;

@@ -9665,13 +9666,14 @@ 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());

if (kvm_host_cr4_reserved_bits(c) != cr4_reserved_bits)
return -EIO;

- return kvm_x86_ops->check_processor_compatibility();
+ return ops->check_processor_compatibility();
}

bool kvm_vcpu_is_reset_bsp(struct kvm_vcpu *vcpu)
--
2.24.1
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