From: Marcelo Tosatti <[EMAIL PROTECTED]> Add basic KVM paravirt support. Avoid vm-exits on IO delays.
v1->v2: - replace KVM_CAP_CLOCKSOURCE with KVM_CAP_PARA_FEATURES - cover FEATURE_CLOCKSOURCE v2->v3: - switch to one ioctl per paravirt feature Signed-off-by: Marcelo Tosatti <[EMAIL PROTECTED]> Signed-off-by: Avi Kivity <[EMAIL PROTECTED]> --- arch/x86/kvm/x86.c | 1 + include/asm-x86/kvm_para.h | 3 ++- 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 6f09840..cafed91 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -805,6 +805,7 @@ int kvm_dev_ioctl_check_extension(long ext) case KVM_CAP_SET_TSS_ADDR: case KVM_CAP_EXT_CPUID: case KVM_CAP_CLOCKSOURCE: + 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 e92e703..ea7907d 100644 --- a/include/linux/kvm.h +++ b/include/linux/kvm.h @@ -236,6 +236,7 @@ struct kvm_vapic_addr { #define KVM_CAP_CLOCKSOURCE 8 #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_NOP_IO_DELAY 11 /* * ioctls for VM fds -- 1.5.4.2 ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ kvm-devel mailing list kvm-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-devel