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Date: Mon, 27 Nov 2006 12:15:37 -0000
From: Avi Kivity <avi@...ranet.com>
To: kvm-devel@...ts.sourceforge.net
Cc: linux-kernel@...r.kernel.org, akpm@...l.org
Subject: [PATCH 5/38] KVM: Make the hardware setup operations (non-percpu)
arch operations
Signed-off-by: Avi Kivity <avi@...ranet.com>
Index: linux-2.6/drivers/kvm/kvm.h
===================================================================
--- linux-2.6.orig/drivers/kvm/kvm.h
+++ linux-2.6/drivers/kvm/kvm.h
@@ -240,6 +240,8 @@ struct kvm_arch_ops {
int (*disabled_by_bios)(void); /* __init */
void (*hardware_enable)(void *dummy); /* __init */
void (*hardware_disable)(void *dummy);
+ int (*hardware_setup)(void); /* __init */
+ void (*hardware_unsetup)(void); /* __exit */
};
extern struct kvm_stat kvm_stat;
Index: linux-2.6/drivers/kvm/kvm_main.c
===================================================================
--- linux-2.6.orig/drivers/kvm/kvm_main.c
+++ linux-2.6/drivers/kvm/kvm_main.c
@@ -124,7 +124,6 @@ static const u32 vmx_msr_index[] = {
#define MSR_IA32_TIME_STAMP_COUNTER 0x010
#define MSR_IA32_FEATURE_CONTROL 0x03a
-#define MSR_IA32_VMX_BASIC_MSR 0x480
#define MSR_IA32_VMX_PINBASED_CTLS_MSR 0x481
#define MSR_IA32_VMX_PROCBASED_CTLS_MSR 0x482
#define MSR_IA32_VMX_EXIT_CTLS_MSR 0x483
@@ -303,11 +302,12 @@ DEFINE_PER_CPU(struct vmcs *, vmxarea);
EXPORT_SYMBOL_GPL(per_cpu__vmxarea); /* temporary hack */
static DEFINE_PER_CPU(struct vmcs *, current_vmcs);
-static struct vmcs_descriptor {
+struct vmcs_descriptor {
int size;
int order;
u32 revision_id;
} vmcs_descriptor;
+EXPORT_SYMBOL_GPL(vmcs_descriptor);
#ifdef __x86_64__
static unsigned long read_msr(unsigned long msr)
@@ -394,16 +394,6 @@ int kvm_write_guest(struct kvm_vcpu *vcp
return req_size - size;
}
-static __init void setup_vmcs_descriptor(void)
-{
- u32 vmx_msr_low, vmx_msr_high;
-
- rdmsr(MSR_IA32_VMX_BASIC_MSR, vmx_msr_low, vmx_msr_high);
- vmcs_descriptor.size = vmx_msr_high & 0x1fff;
- vmcs_descriptor.order = get_order(vmcs_descriptor.size);
- vmcs_descriptor.revision_id = vmx_msr_low;
-};
-
static void vmcs_clear(struct vmcs *vmcs)
{
u64 phys_addr = __pa(vmcs);
@@ -501,8 +491,7 @@ static void vcpu_put(struct kvm_vcpu *vc
mutex_unlock(&vcpu->mutex);
}
-
-static struct vmcs *alloc_vmcs_cpu(int cpu)
+struct vmcs *alloc_vmcs_cpu(int cpu)
{
int node = cpu_to_node(cpu);
struct page *pages;
@@ -516,42 +505,18 @@ static struct vmcs *alloc_vmcs_cpu(int c
vmcs->revision_id = vmcs_descriptor.revision_id; /* vmcs revision id */
return vmcs;
}
+EXPORT_SYMBOL_GPL(alloc_vmcs_cpu);
static struct vmcs *alloc_vmcs(void)
{
return alloc_vmcs_cpu(smp_processor_id());
}
-static void free_vmcs(struct vmcs *vmcs)
+void free_vmcs(struct vmcs *vmcs)
{
free_pages((unsigned long)vmcs, vmcs_descriptor.order);
}
-
-static __exit void free_kvm_area(void)
-{
- int cpu;
-
- for_each_online_cpu(cpu)
- free_vmcs(per_cpu(vmxarea, cpu));
-}
-
-static __init int alloc_kvm_area(void)
-{
- int cpu;
-
- for_each_online_cpu(cpu) {
- struct vmcs *vmcs;
-
- vmcs = alloc_vmcs_cpu(cpu);
- if (!vmcs) {
- free_kvm_area();
- return -ENOMEM;
- }
-
- per_cpu(vmxarea, cpu) = vmcs;
- }
- return 0;
-}
+EXPORT_SYMBOL_GPL(free_vmcs);
static int kvm_dev_open(struct inode *inode, struct file *filp)
{
@@ -3592,6 +3557,10 @@ int kvm_init_arch(struct kvm_arch_ops *o
return -EOPNOTSUPP;
}
+ r = kvm_arch_ops->hardware_setup();
+ if (r < 0)
+ return r;
+
on_each_cpu(kvm_arch_ops->hardware_enable, 0, 0, 1);
register_reboot_notifier(&kvm_reboot_notifier);
@@ -3603,7 +3572,12 @@ int kvm_init_arch(struct kvm_arch_ops *o
goto out_free;
}
+ return r;
+
out_free:
+ unregister_reboot_notifier(&kvm_reboot_notifier);
+ on_each_cpu(kvm_arch_ops->hardware_disable, 0, 0, 1);
+ kvm_arch_ops->hardware_unsetup();
return r;
}
@@ -3613,6 +3587,7 @@ void kvm_exit_arch(void)
unregister_reboot_notifier(&kvm_reboot_notifier);
on_each_cpu(kvm_arch_ops->hardware_disable, 0, 0, 1);
+ kvm_arch_ops->hardware_unsetup();
}
static __init int kvm_init(void)
@@ -3622,14 +3597,9 @@ static __init int kvm_init(void)
kvm_init_debug();
- setup_vmcs_descriptor();
- r = alloc_kvm_area();
- if (r)
- goto out;
-
if ((bad_page = alloc_page(GFP_KERNEL)) == NULL) {
r = -ENOMEM;
- goto out_free;
+ goto out;
}
bad_page_address = page_to_pfn(bad_page) << PAGE_SHIFT;
@@ -3637,8 +3607,6 @@ static __init int kvm_init(void)
return r;
-out_free:
- free_kvm_area();
out:
kvm_exit_debug();
return r;
@@ -3647,7 +3615,6 @@ out:
static __exit void kvm_exit(void)
{
kvm_exit_debug();
- free_kvm_area();
__free_page(pfn_to_page(bad_page_address >> PAGE_SHIFT));
}
Index: linux-2.6/drivers/kvm/vmx.c
===================================================================
--- linux-2.6.orig/drivers/kvm/vmx.c
+++ linux-2.6/drivers/kvm/vmx.c
@@ -25,6 +25,12 @@ MODULE_LICENSE("GPL");
DECLARE_PER_CPU(struct vmcs *, vmxarea);
+extern struct vmcs_descriptor {
+ int size;
+ int order;
+ u32 revision_id;
+} vmcs_descriptor;
+
static __init int cpu_has_kvm_support(void)
{
unsigned long ecx = cpuid_ecx(1);
@@ -59,9 +65,62 @@ static void hardware_disable(void *garba
asm volatile (ASM_VMX_VMXOFF : : : "cc");
}
+static __init void setup_vmcs_descriptor(void)
+{
+ u32 vmx_msr_low, vmx_msr_high;
+
+ rdmsr(MSR_IA32_VMX_BASIC_MSR, vmx_msr_low, vmx_msr_high);
+ vmcs_descriptor.size = vmx_msr_high & 0x1fff;
+ vmcs_descriptor.order = get_order(vmcs_descriptor.size);
+ vmcs_descriptor.revision_id = vmx_msr_low;
+};
+
+void free_vmcs(struct vmcs *vmcs);
+
+static __exit void free_kvm_area(void)
+{
+ int cpu;
+
+ for_each_online_cpu(cpu)
+ free_vmcs(per_cpu(vmxarea, cpu));
+}
+
+extern struct vmcs *alloc_vmcs_cpu(int cpu);
+
+static __init int alloc_kvm_area(void)
+{
+ int cpu;
+
+ for_each_online_cpu(cpu) {
+ struct vmcs *vmcs;
+
+ vmcs = alloc_vmcs_cpu(cpu);
+ if (!vmcs) {
+ free_kvm_area();
+ return -ENOMEM;
+ }
+
+ per_cpu(vmxarea, cpu) = vmcs;
+ }
+ return 0;
+}
+
+static __init int hardware_setup(void)
+{
+ setup_vmcs_descriptor();
+ return alloc_kvm_area();
+}
+
+static __exit void hardware_unsetup(void)
+{
+ free_kvm_area();
+}
+
static struct kvm_arch_ops vmx_arch_ops = {
.cpu_has_kvm_support = cpu_has_kvm_support,
.disabled_by_bios = vmx_disabled_by_bios,
+ .hardware_setup = hardware_setup,
+ .hardware_unsetup = hardware_unsetup,
.hardware_enable = hardware_enable,
.hardware_disable = hardware_disable,
};
Index: linux-2.6/drivers/kvm/vmx.h
===================================================================
--- linux-2.6.orig/drivers/kvm/vmx.h
+++ linux-2.6/drivers/kvm/vmx.h
@@ -286,4 +286,6 @@ enum vmcs_field {
#define CR4_VMXE 0x2000
+#define MSR_IA32_VMX_BASIC_MSR 0x480
+
#endif
-
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