x86: KVM guest: add basic paravirt support

Add basic KVM paravirt support. Avoid vm-exits on IO delays.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 40cedc255eda..e5790fe9e330 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -384,6 +384,14 @@ config KVM_CLOCK
           provides the guest with timing infrastructure such as time of day, and
           system time
 
+config KVM_GUEST
+        bool "KVM Guest support"
+        select PARAVIRT
+        depends on !(X86_VISWS || X86_VOYAGER)
+        help
+         This option enables various optimizations for running under the KVM
+         hypervisor.
+
 source "arch/x86/lguest/Kconfig"
 
 config PARAVIRT