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, 7 insertions, 0 deletions

diff --git a/hw/acpi.c b/hw/acpi.c
index 45963d37e8..66a5faa0fd 100644
--- a/hw/acpi.c
+++ b/hw/acpi.c
@@ -23,6 +23,7 @@
 #include "sysemu.h"
 #include "i2c.h"
 #include "smbus.h"
+#include "kvm.h"
 
 //#define DEBUG
 
@@ -501,6 +502,12 @@ i2c_bus *piix4_pm_init(PCIBus *bus, int devfn, uint32_t smb_io_base,
 
     register_ioport_write(ACPI_DBG_IO_ADDR, 4, 4, acpi_dbg_writel, s);
 
+    if (kvm_enabled()) {
+        /* Mark SMM as already inited to prevent SMM from running.  KVM does not
+         * support SMM mode. */
+        pci_conf[0x5B] = 0x02;
+    }
+
     /* XXX: which specification is used ? The i82731AB has different
        mappings */
     pci_conf[0x5f] = (parallel_hds[0] != NULL ? 0x80 : 0) | 0x10;