From a28e4f5a621289fe0d9c8a461b0c256f9e17f3bc Mon Sep 17 00:00:00 2001 From: Marcelo Tosatti Date: Fri, 22 Feb 2008 12:21:36 -0500 Subject: KVM: add basic paravirt support Add basic KVM paravirt support. Avoid vm-exits on IO delays. Signed-off-by: Marcelo Tosatti Signed-off-by: Avi Kivity --- arch/x86/kvm/x86.c | 1 + include/asm-x86/kvm_para.h | 3 ++- include/linux/kvm.h | 1 + 3 files changed, 4 insertions(+), 1 deletion(-) 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 -- cgit v1.2.2