From 9a2bb7f486dc639a1cf2ad803bf2227f0dc0809d Mon Sep 17 00:00:00 2001 From: Avi Kivity Date: Thu, 22 Feb 2007 12:58:31 +0200 Subject: KVM: Use a shared page for kernel/user communication when runing a vcpu Instead of passing a 'struct kvm_run' back and forth between the kernel and userspace, allocate a page and allow the user to mmap() it. This reduces needless copying and makes the interface expandable by providing lots of free space. Signed-off-by: Avi Kivity --- include/linux/kvm.h | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) (limited to 'include/linux/kvm.h') diff --git a/include/linux/kvm.h b/include/linux/kvm.h index 275354ffa1cb..d88e7508ee0a 100644 --- a/include/linux/kvm.h +++ b/include/linux/kvm.h @@ -11,7 +11,7 @@ #include #include -#define KVM_API_VERSION 4 +#define KVM_API_VERSION 5 /* * Architectural interrupt line count, and the size of the bitmap needed @@ -49,7 +49,7 @@ enum kvm_exit_reason { KVM_EXIT_SHUTDOWN = 8, }; -/* for KVM_RUN */ +/* for KVM_RUN, returned by mmap(vcpu_fd, offset=0) */ struct kvm_run { /* in */ __u32 emulated; /* skip current instruction */ @@ -233,7 +233,7 @@ struct kvm_dirty_log { /* * ioctls for vcpu fds */ -#define KVM_RUN _IOWR(KVMIO, 2, struct kvm_run) +#define KVM_RUN _IO(KVMIO, 16) #define KVM_GET_REGS _IOR(KVMIO, 3, struct kvm_regs) #define KVM_SET_REGS _IOW(KVMIO, 4, struct kvm_regs) #define KVM_GET_SREGS _IOR(KVMIO, 5, struct kvm_sregs) -- cgit v1.2.3