From: Marcelo Tosatti <[EMAIL PROTECTED]>
Add basic KVM paravirt support. Avoid vm-exits on IO delays.
Signed-off-by: Marcelo Tosatti <[EMAIL PROTECTED]>
Signed-off-by: Avi Kivity <[EMAIL PROTECTED]>
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index cf11e6d..204aed5 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -818,6 +818,7 @@ int kvm_dev_ioctl_check_extension(long ext)
case KVM_CAP_EXT_CPUID:
case KVM_CAP_CLOCKSOURCE:
case KVM_CAP_PIT:
+ case KVM_CAP_NOP_IO_DELAY:
r = 1;
break;
case KVM_CAP_VAPIC:
diff --git a/include/asm-x86/kvm_para.h b/include/asm-x86/kvm_para.h
index 5ab7d3d..ed5df3a 100644
--- a/include/asm-x86/kvm_para.h
+++ b/include/asm-x86/kvm_para.h
@@ -10,7 +10,8 @@
* paravirtualization, the appropriate feature bit should be checked.
*/
#define KVM_CPUID_FEATURES 0x40000001
-#define KVM_FEATURE_CLOCKSOURCE 0
+#define KVM_FEATURE_CLOCKSOURCE 0
+#define KVM_FEATURE_NOP_IO_DELAY 1
#define MSR_KVM_WALL_CLOCK 0x11
#define MSR_KVM_SYSTEM_TIME 0x12
diff --git a/include/linux/kvm.h b/include/linux/kvm.h
index a2f3274..76f0947 100644
--- a/include/linux/kvm.h
+++ b/include/linux/kvm.h
@@ -237,6 +237,7 @@ struct kvm_vapic_addr {
#define KVM_CAP_NR_VCPUS 9 /* returns max vcpus per vm */
#define KVM_CAP_NR_MEMSLOTS 10 /* returns max memory slots per vm */
#define KVM_CAP_PIT 11
+#define KVM_CAP_NOP_IO_DELAY 12
/*
* ioctls for VM fds
-------------------------------------------------------------------------
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