[PATCH 2/2] qemu-kvm: Detect availability of kvm_para.h

[Jan Kiszka <jan.kiszka@web.de>]

Will be required for upstream's KVM cpuid, so qemu-kvm will probably
morph towards conditional paravirt support as well, depending on
CONFIG_KVM_PARA. Make it available already.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
---

 configure |   11 +++++++++++
 1 files changed, 11 insertions(+), 0 deletions(-)

diff --git a/configure b/configure
index 6ba565a..b6bebac 100755
--- a/configure
+++ b/configure
@@ -226,6 +226,7 @@ curses=""
 docs=""
 fdt=""
 kvm=""
+kvm_para=""
 nptl=""
 sdl=""
 sparse="no"
@@ -1445,6 +1446,13 @@ EOF
   kvm_cflags="$kvm_cflags -idirafter $source_path/compat"
   if compile_prog "$kvm_cflags" "" ; then
     kvm=yes
+    cat > $TMPC <<EOF
+#include <linux/kvm_para.h>
+int main(void) { return 0; }
+EOF
+    if compile_prog "$kvm_cflags" "" ; then
+      kvm_para=yes
+    fi
   else
     if test "$kvm" = "yes" ; then
       if [ -x "`which awk 2>/dev/null`" ] && \
@@ -2559,6 +2567,9 @@ case "$target_arch2" in
       \( "$target_arch2" = "i386"   -a "$cpu" = "x86_64" \) \) ; then
       echo "CONFIG_KVM=y" >> $config_target_mak
       echo "KVM_CFLAGS=$kvm_cflags" >> $config_target_mak
+      if test "$kvm_para" = "yes"; then
+        echo "CONFIG_KVM_PARA=y" >> $config_target_mak
+      fi
       if test $kvm_cap_pit = "yes" ; then
         echo "CONFIG_KVM_PIT=y" >> $config_target_mak
       fi