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| author |   Marcelo Tosatti <mtosatti@redhat.com> | 2008-02-22 12:21:36 -0500 |
|---|---|---|
| committer |   Avi Kivity <avi@qumranet.com> | 2008-04-27 12:00:24 +0300 |
| commit | a28e4f5a621289fe0d9c8a461b0c256f9e17f3bc (patch) | |
| tree | dfa62426cf55dfb2fad66e924eab34e9840bff12 | |
| parent | KVM: Add reset support for in kernel PIT (diff) | |
| download | linux-dev-a28e4f5a621289fe0d9c8a461b0c256f9e17f3bc.tar.xz linux-dev-a28e4f5a621289fe0d9c8a461b0c256f9e17f3bc.zip | |
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>
| -rw-r--r-- | arch/x86/kvm/x86.c | 1 | ||||
| -rw-r--r-- | include/asm-x86/kvm_para.h | 3 | ||||
| -rw-r--r-- | include/linux/kvm.h | 1 |
3 files changed, 4 insertions, 1 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 621a8e362fe7..1b9e695cc641 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -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: diff --git a/include/asm-x86/kvm_para.h b/include/asm-x86/kvm_para.h index 5ab7d3dbd357..ed5df3a54aab 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 a2f3274016ee..76f09474be98 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 |