diff options
| author | Avi Kivity <avi@qumranet.com> | 2007-02-22 12:58:31 +0200 |
|---|---|---|
| committer | Avi Kivity <avi@qumranet.com> | 2007-05-03 10:52:23 +0300 |
| commit | 9a2bb7f486dc639a1cf2ad803bf2227f0dc0809d (patch) | |
| tree | db323e11ae5a5286a1e344b444162be53bc4d9fc /include/linux | |
| parent | 1ea252afcd4b264b71d9c3f55358ff5ba4c04f1b (diff) | |
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 <avi@qumranet.com>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/kvm.h | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/include/linux/kvm.h b/include/linux/kvm.h index 275354ffa1c..d88e7508ee0 100644 --- a/include/linux/kvm.h +++ b/include/linux/kvm.h @@ -11,7 +11,7 @@ #include <asm/types.h> #include <linux/ioctl.h> -#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) |