[PATCH v2 39/50] KVM: x86: Move CPU compat checks hook to kvm_x86_ops (from kvm_x86_init_ops)
Sean Christopherson
seanjc at google.com
Wed Nov 30 15:09:23 PST 2022
Move the .check_processor_compatibility() callback from kvm_x86_init_ops
to kvm_x86_ops to allow a future patch to do compatibility checks during
CPU hotplug.
Do kvm_ops_update() before compat checks so that static_call() can be
used during compat checks.
Signed-off-by: Sean Christopherson <seanjc at google.com>
---
arch/x86/include/asm/kvm-x86-ops.h | 1 +
arch/x86/include/asm/kvm_host.h | 3 ++-
arch/x86/kvm/svm/svm.c | 5 +++--
arch/x86/kvm/vmx/vmx.c | 16 +++++++--------
arch/x86/kvm/x86.c | 31 +++++++++++-------------------
5 files changed, 25 insertions(+), 31 deletions(-)
diff --git a/arch/x86/include/asm/kvm-x86-ops.h b/arch/x86/include/asm/kvm-x86-ops.h
index abccd51dcfca..dba2909e5ae2 100644
--- a/arch/x86/include/asm/kvm-x86-ops.h
+++ b/arch/x86/include/asm/kvm-x86-ops.h
@@ -14,6 +14,7 @@ BUILD_BUG_ON(1)
* to make a definition optional, but in this case the default will
* be __static_call_return0.
*/
+KVM_X86_OP(check_processor_compatibility)
KVM_X86_OP(hardware_enable)
KVM_X86_OP(hardware_disable)
KVM_X86_OP(hardware_unsetup)
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index d79aedf70908..ba74fea6850b 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1518,6 +1518,8 @@ 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);
@@ -1729,7 +1731,6 @@ struct kvm_x86_nested_ops {
};
struct kvm_x86_init_ops {
- 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 9f94efcb9aa6..c2e95c0d9fd8 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -543,7 +543,7 @@ static bool kvm_is_svm_supported(void)
return true;
}
-static int __init svm_check_processor_compat(void)
+static int svm_check_processor_compat(void)
{
if (!kvm_is_svm_supported())
return -EIO;
@@ -4695,6 +4695,8 @@ static int svm_vm_init(struct kvm *kvm)
static struct kvm_x86_ops svm_x86_ops __initdata = {
.name = KBUILD_MODNAME,
+ .check_processor_compatibility = svm_check_processor_compat,
+
.hardware_unsetup = svm_hardware_unsetup,
.hardware_enable = svm_hardware_enable,
.hardware_disable = svm_hardware_disable,
@@ -5079,7 +5081,6 @@ static __init int svm_hardware_setup(void)
static struct kvm_x86_init_ops svm_init_ops __initdata = {
.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 2a8a6e481c76..6416ed5b7f89 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -2520,8 +2520,7 @@ static bool cpu_has_perf_global_ctrl_bug(void)
return false;
}
-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;
@@ -2539,7 +2538,7 @@ 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;
@@ -2548,8 +2547,8 @@ 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 _pin_based_exec_control = 0;
@@ -2710,7 +2709,7 @@ static __init int setup_vmcs_config(struct vmcs_config *vmcs_conf,
return 0;
}
-static bool __init kvm_is_vmx_supported(void)
+static bool kvm_is_vmx_supported(void)
{
if (!cpu_has_vmx()) {
pr_err("CPU doesn't support VMX\n");
@@ -2726,7 +2725,7 @@ static bool __init kvm_is_vmx_supported(void)
return true;
}
-static int __init vmx_check_processor_compat(void)
+static int vmx_check_processor_compat(void)
{
struct vmcs_config vmcs_conf;
struct vmx_capability vmx_cap;
@@ -8104,6 +8103,8 @@ static void vmx_vm_destroy(struct kvm *kvm)
static struct kvm_x86_ops vmx_x86_ops __initdata = {
.name = KBUILD_MODNAME,
+ .check_processor_compatibility = vmx_check_processor_compat,
+
.hardware_unsetup = vmx_hardware_unsetup,
.hardware_enable = vmx_hardware_enable,
@@ -8501,7 +8502,6 @@ static __init int hardware_setup(void)
}
static struct kvm_x86_init_ops vmx_init_ops __initdata = {
- .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 5551f3552f08..ee9af412ffd4 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -9279,12 +9279,7 @@ static inline void kvm_ops_update(struct kvm_x86_init_ops *ops)
kvm_pmu_ops_update(ops->pmu_ops);
}
-struct kvm_cpu_compat_check {
- struct kvm_x86_init_ops *ops;
- int *ret;
-};
-
-static int kvm_x86_check_processor_compatibility(struct kvm_x86_init_ops *ops)
+static int kvm_x86_check_processor_compatibility(void)
{
struct cpuinfo_x86 *c = &cpu_data(smp_processor_id());
@@ -9294,19 +9289,16 @@ static int kvm_x86_check_processor_compatibility(struct kvm_x86_init_ops *ops)
__cr4_reserved_bits(cpu_has, &boot_cpu_data))
return -EIO;
- return ops->check_processor_compatibility();
+ return static_call(kvm_x86_check_processor_compatibility)();
}
-static void kvm_x86_check_cpu_compat(void *data)
+static void kvm_x86_check_cpu_compat(void *ret)
{
- struct kvm_cpu_compat_check *c = data;
-
- *c->ret = kvm_x86_check_processor_compatibility(c->ops);
+ *(int *)ret = kvm_x86_check_processor_compatibility();
}
static int __kvm_x86_vendor_init(struct kvm_x86_init_ops *ops)
{
- struct kvm_cpu_compat_check c;
u64 host_pat;
int r, cpu;
@@ -9377,12 +9369,12 @@ static int __kvm_x86_vendor_init(struct kvm_x86_init_ops *ops)
if (r != 0)
goto out_mmu_exit;
- c.ret = &r;
- c.ops = ops;
+ kvm_ops_update(ops);
+
for_each_online_cpu(cpu) {
- smp_call_function_single(cpu, kvm_x86_check_cpu_compat, &c, 1);
+ smp_call_function_single(cpu, kvm_x86_check_cpu_compat, &r, 1);
if (r < 0)
- goto out_hardware_unsetup;
+ goto out_unwind_ops;
}
/*
@@ -9390,8 +9382,6 @@ static int __kvm_x86_vendor_init(struct kvm_x86_init_ops *ops)
* absolutely necessary, as most operations from this point forward
* require unwinding.
*/
- kvm_ops_update(ops);
-
kvm_timer_init();
if (pi_inject_timer == -1)
@@ -9427,8 +9417,9 @@ static int __kvm_x86_vendor_init(struct kvm_x86_init_ops *ops)
kvm_init_msr_list();
return 0;
-out_hardware_unsetup:
- ops->runtime_ops->hardware_unsetup();
+out_unwind_ops:
+ kvm_x86_ops.hardware_enable = NULL;
+ static_call(kvm_x86_hardware_unsetup)();
out_mmu_exit:
kvm_mmu_vendor_module_exit();
out_free_percpu:
--
2.38.1.584.g0f3c55d4c2-goog
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