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authorChristian Borntraeger <borntraeger@de.ibm.com>2012-01-11 11:20:30 +0100
committerAvi Kivity <avi@redhat.com>2012-03-05 14:52:22 +0200
commitb9e5dc8d4511e6a00862a795319569e7fe7f60f4 (patch)
tree1be01a8d13e2e5023c22db4a7dd87518f14af5b3 /arch/ia64
parent8d26cf7b40b1648c39e77a113dac07ad31363120 (diff)
downloadop-kernel-dev-b9e5dc8d4511e6a00862a795319569e7fe7f60f4.zip
op-kernel-dev-b9e5dc8d4511e6a00862a795319569e7fe7f60f4.tar.gz
KVM: provide synchronous registers in kvm_run
On some cpus the overhead for virtualization instructions is in the same range as a system call. Having to call multiple ioctls to get set registers will make certain userspace handled exits more expensive than necessary. Lets provide a section in kvm_run that works as a shared save area for guest registers. We also provide two 64bit flags fields (architecture specific), that will specify 1. which parts of these fields are valid. 2. which registers were modified by userspace Each bit for these flag fields will define a group of registers (like general purpose) or a single register. Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch/ia64')
-rw-r--r--arch/ia64/include/asm/kvm.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/ia64/include/asm/kvm.h b/arch/ia64/include/asm/kvm.h
index bc90c75..b9f82c8 100644
--- a/arch/ia64/include/asm/kvm.h
+++ b/arch/ia64/include/asm/kvm.h
@@ -261,4 +261,8 @@ struct kvm_debug_exit_arch {
struct kvm_guest_debug_arch {
};
+/* definition of registers in kvm_run */
+struct kvm_sync_regs {
+};
+
#endif
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