Add KVM support to QEMU

This patch adds very basic KVM support.  KVM is a kernel module for Linux that
allows userspace programs to make use of hardware virtualization support.  It
current supports x86 hardware virtualization using Intel VT-x or AMD-V.  It
also supports IA64 VT-i, PPC 440, and S390.

This patch only implements the bare minimum support to get a guest booting.  It
has very little impact the rest of QEMU and attempts to integrate nicely with
the rest of QEMU.

Even though this implementation is basic, it is significantly faster than TCG.
Booting and shutting down a Linux guest:

w/TCG:  1:32.36 elapsed  84% CPU

w/KVM:  0:31.14 elapsed  59% CPU

Right now, KVM is disabled by default and must be explicitly enabled with
 -enable-kvm.  We can enable it by default later when we have had better
testing.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>



git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5627 c046a42c-6fe2-441c-8c8c-71466251a162

1 files changed, 16 insertions, 0 deletions

diff --git a/monitor.c b/monitor.c
index 61bd33543a..8fff3aa752 100644
--- a/monitor.c
+++ b/monitor.c
@@ -37,6 +37,7 @@
 #include <dirent.h>
 #include "qemu-timer.h"
 #include "migration.h"
+#include "kvm.h"
 
 //#define DEBUG
 //#define DEBUG_COMPLETION
@@ -1263,6 +1264,19 @@ static void do_info_kqemu(void)
 #endif
 }
 
+static void do_info_kvm(void)
+{
+#ifdef CONFIG_KVM
+    term_printf("kvm support: ");
+    if (kvm_enabled())
+	term_printf("enabled\n");
+    else
+	term_printf("disabled\n");
+#else
+    term_printf("kvm support: not compiled\n");
+#endif
+}
+
 #ifdef CONFIG_PROFILER
 
 int64_t kqemu_time;
@@ -1497,6 +1511,8 @@ static const term_cmd_t info_cmds[] = {
       "", "show dynamic compiler info", },
     { "kqemu", "", do_info_kqemu,
       "", "show kqemu information", },
+    { "kvm", "", do_info_kvm,
+      "", "show kvm information", },
     { "usb", "", usb_info,
       "", "show guest USB devices", },
     { "usbhost", "", usb_host_info,