diff mbox

[RFC:,tsc,virtualization,19/20] IOCTL for different TSC modes

Message ID 1260850127-9766-20-git-send-email-zamsden@redhat.com (mailing list archive)
State New, archived
Headers show

Commit Message

Zachary Amsden Dec. 15, 2009, 4:08 a.m. UTC 
None
diff mbox

Patch

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 313befc..f2cf4c5 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -418,6 +418,7 @@  struct kvm_arch{
 	unsigned long irq_sources_bitmap;
 	u64 vm_init_tsc;
 	s64 kvmclock_offset;
+	unsigned int tsc_mode;
 	unsigned int tsc_khz;
 	unsigned long tsc_multiplier;
 	int tsc_shift;
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index c1bed03..f8fa978 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1727,7 +1727,7 @@  int kvm_dev_ioctl_check_extension(long ext)
 	case KVM_CAP_SET_IDENTITY_MAP_ADDR:
 	case KVM_CAP_XEN_HVM:
 	case KVM_CAP_ADJUST_CLOCK:
-	case KVM_CAP_SET_TSC_RATE:
+	case KVM_CAP_SET_TSC_MODE:
 		r = 1;
 		break;
 	case KVM_CAP_COALESCED_MMIO:
@@ -3015,23 +3015,26 @@  long kvm_arch_vm_ioctl(struct file *filp,
 
 		break;
 	}
-	case KVM_X86_GET_TSC_RATE: {
-		u32 rate = kvm->arch.tsc_khz;
+	case KVM_X86_GET_TSC_MODE: {
+		struct kvm_tsc_state state;
+		state.rate = kvm->arch.tsc_khz;
+		state.mode = kvm->arch.tsc_mode;
 		r = -EFAULT;
-		if (copy_to_user(argp, &rate, sizeof(rate)))
+		if (copy_to_user(argp, &state, sizeof(state)))
 			goto out;
 		r = 0;
 		break;
 	}
-	case KVM_X86_SET_TSC_RATE: {
-		u32 tsc_rate;
+	case KVM_X86_SET_TSC_MODE: {
+		struct kvm_tsc_state state;
 		r = -EFAULT;
-		if (copy_from_user(&tsc_rate, argp, sizeof tsc_rate))
+		if (copy_from_user(&state, argp, sizeof(state)))
 			goto out;
 		r = -EINVAL;
-		if (tsc_rate == 0 || tsc_rate > (1ULL << 30))
+		if (state.rate == 0 || state.rate > (1ULL << 30) ||
+		    state.mode > KVM_TSC_MODE_HYBRID)
 			goto out;
-		r = kvm_set_tsc_rate(kvm, tsc_rate);
+		r = kvm_set_tsc_rate(kvm, state.rate);
 		break;
 	}
 
diff --git a/include/linux/kvm.h b/include/linux/kvm.h
index ac2f0af..85ad3e0 100644
--- a/include/linux/kvm.h
+++ b/include/linux/kvm.h
@@ -440,7 +440,7 @@  struct kvm_ioeventfd {
 #define KVM_CAP_XEN_HVM 38
 #endif
 #define KVM_CAP_ADJUST_CLOCK 39
-#define KVM_CAP_SET_TSC_RATE 40
+#define KVM_CAP_SET_TSC_MODE 40
 
 #ifdef KVM_CAP_IRQ_ROUTING
 
@@ -520,6 +520,17 @@  struct kvm_clock_data {
 	__u32 pad[9];
 };
 
+struct kvm_tsc_state {
+	__u32 rate;
+	__u32 mode;
+};
+
+enum {
+	KVM_TSC_MODE_PASSTHROUGH,
+	KVM_TSC_MODE_INTERCEPT,
+	KVM_TSC_MODE_HYBRID
+};
+
 /*
  * ioctls for VM fds
  */
@@ -620,8 +631,8 @@  struct kvm_clock_data {
 #define KVM_X86_SETUP_MCE         _IOW(KVMIO,  0x9c, __u64)
 #define KVM_X86_GET_MCE_CAP_SUPPORTED _IOR(KVMIO,  0x9d, __u64)
 #define KVM_X86_SET_MCE           _IOW(KVMIO,  0x9e, struct kvm_x86_mce)
-#define KVM_X86_GET_TSC_RATE      _IOR(KVMIO,  0x9f, __u64)
-#define KVM_X86_SET_TSC_RATE      _IOW(KVMIO,  0xa0, __u64)
+#define KVM_X86_GET_TSC_MODE      _IOR(KVMIO,  0x9f, struct kvm_tsc_state)
+#define KVM_X86_SET_TSC_MODE      _IOW(KVMIO,  0xa0, struct kvm_tsc_state)
 
 /*
  * Deprecated interfaces