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Commit a28e4f5a authored by Marcelo Tosatti's avatar Marcelo Tosatti Committed by Avi Kivity
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KVM: add basic paravirt support 



Add basic KVM paravirt support. Avoid vm-exits on IO delays.

Signed-off-by: default avatarMarcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: default avatarAvi Kivity <avi@qumranet.com>
parent 308b0f23

arch/x86/kvm/x86.c

+1 −0
Original line number Diff line number Diff line
@@ -820,6 +820,7 @@ 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:

include/asm-x86/kvm_para.h

+2 −1
Original line number Diff line number Diff line
@@ -11,6 +11,7 @@ 
 */

#define KVM_CPUID_FEATURES	0x40000001

#define KVM_FEATURE_CLOCKSOURCE		0

#define KVM_FEATURE_NOP_IO_DELAY	1



#define MSR_KVM_WALL_CLOCK  0x11

#define MSR_KVM_SYSTEM_TIME 0x12

include/linux/kvm.h

+1 −0
Original line number Diff line number Diff line
@@ -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