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KVM: add basic paravirt support 

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

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Marcelo Tosatti 2008-02-22 12:21:36 -05:00 committed by Avi Kivity
parent 308b0f239e
commit a28e4f5a62
3 changed files with 4 additions and 1 deletions
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1
arch/x86/kvm/x86.c
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@ -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:

3
include/asm-x86/kvm_para.h
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@ -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

1
include/linux/kvm.h
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@ -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