Merge remote-tracking branch 'remotes/berrange/tags/crypto-luks-pull-request' into staging

crypto: improve performance of ciphers in XTS mode

Currently QEMU uses its own XTS cipher mode, however, this has
relatively poor performance.

Gcrypt now includes its own XTS cipher which is at least x2 faster than
what we get with QEMU's on Fedora/RHEL hosts. With gcrypt git master, a
further x5-6 speed up is seen.

This is essential for QEMU's LUKS performance to be viable.

# gpg: Signature made Mon 28 Oct 2019 15:48:38 GMT
# gpg:                using RSA key DAF3A6FDB26B62912D0E8E3FBE86EBB415104FDF
# gpg: Good signature from "Daniel P. Berrange <dan@berrange.com>" [full]
# gpg:                 aka "Daniel P. Berrange <berrange@redhat.com>" [full]
# Primary key fingerprint: DAF3 A6FD B26B 6291 2D0E  8E3F BE86 EBB4 1510 4FDF

* remotes/berrange/tags/crypto-luks-pull-request:
  crypto: add support for nettle's native XTS impl
  crypto: add support for gcrypt's native XTS impl
  tests: benchmark crypto with fixed data size, not time period
  tests: allow filtering crypto cipher benchmark tests

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 40 insertions, 0 deletions

diff --git a/configure b/configure
index 821fda5..3be9e92 100755
--- a/configure
+++ b/configure
@@ -472,8 +472,11 @@ gtk_gl="no"
 tls_priority="NORMAL"
 gnutls=""
 nettle=""
+nettle_xts="no"
 gcrypt=""
 gcrypt_hmac="no"
+gcrypt_xts="no"
+qemu_private_xts="yes"
 auth_pam=""
 vte=""
 virglrenderer=""
@@ -2869,6 +2872,19 @@ if test "$nettle" != "no"; then
             pass="yes"
         fi
     fi
+    if test "$pass" = "yes"
+    then
+        cat > $TMPC << EOF
+#include <nettle/xts.h>
+int main(void) {
+  return 0;
+}
+EOF
+        if compile_prog "$nettle_cflags" "$nettle_libs" ; then
+            nettle_xts=yes
+            qemu_private_xts=no
+        fi
+    fi
     if test "$pass" = "no" && test "$nettle" = "yes"; then
         feature_not_found "nettle" "Install nettle devel >= 2.7.1"
     else
@@ -2911,6 +2927,18 @@ EOF
         if compile_prog "$gcrypt_cflags" "$gcrypt_libs" ; then
             gcrypt_hmac=yes
         fi
+        cat > $TMPC << EOF
+#include <gcrypt.h>
+int main(void) {
+  gcry_cipher_hd_t handle;
+  gcry_cipher_open(&handle, GCRY_CIPHER_AES, GCRY_CIPHER_MODE_XTS, 0);
+  return 0;
+}
+EOF
+        if compile_prog "$gcrypt_cflags" "$gcrypt_libs" ; then
+            gcrypt_xts=yes
+            qemu_private_xts=no
+        fi
     elif test "$gcrypt" = "yes"; then
         feature_not_found "gcrypt" "Install gcrypt devel >= 1.5.0"
     else
@@ -6341,7 +6369,16 @@ echo "VTE support       $vte $(echo_version $vte $vteversion)"
 echo "TLS priority      $tls_priority"
 echo "GNUTLS support    $gnutls"
 echo "libgcrypt         $gcrypt"
+if test "$gcrypt" = "yes"
+then
+   echo "  hmac            $gcrypt_hmac"
+   echo "  XTS             $gcrypt_xts"
+fi
 echo "nettle            $nettle $(echo_version $nettle $nettle_version)"
+if test "$nettle" = "yes"
+then
+   echo "  XTS             $nettle_xts"
+fi
 echo "libtasn1          $tasn1"
 echo "PAM               $auth_pam"
 echo "iconv support     $iconv"
@@ -6819,6 +6856,9 @@ if test "$nettle" = "yes" ; then
   echo "CONFIG_NETTLE=y" >> $config_host_mak
   echo "CONFIG_NETTLE_VERSION_MAJOR=${nettle_version%%.*}" >> $config_host_mak
 fi
+if test "$qemu_private_xts" = "yes" ; then
+  echo "CONFIG_QEMU_PRIVATE_XTS=y" >> $config_host_mak
+fi
 if test "$tasn1" = "yes" ; then
   echo "CONFIG_TASN1=y" >> $config_host_mak
 fi