[PATCH v1 3/6] tests/migration/aarch64: Speed up the aarch64 migration test

["Alex Bennée" <alex.bennee@linaro.org>]

From: Thomas Huth <thuth@redhat.com>

The migration tests spend a lot of time waiting for a sign of live
of the guest on the serial console. The aarch64 migration code only
outputs "B"s every couple of seconds (at least it takes more than 4
seconds between each characeter on my x86 laptop). There are a lot
of migration tests, and if each test that checks for a successful
migration waits for these characters before and after migration, the
wait time sums up to multiple minutes! Let's use a shorter delay to
speed things up.

While we're at it, also remove a superfluous masking with 0xff - we're
reading and storing bytes, so the upper bits of the register do not
matter anyway.

With these changes, the test runs twice as fast on my laptop, decreasing
the total run time from approx. 8 minutes to only 4 minutes!

Signed-off-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <20220819053802.296584-3-thuth@redhat.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
---
 tests/migration/aarch64/a-b-kernel.h | 10 +++++-----
 tests/migration/aarch64/a-b-kernel.S |  3 +--
 2 files changed, 6 insertions(+), 7 deletions(-)

diff --git a/tests/migration/aarch64/a-b-kernel.h b/tests/migration/aarch64/a-b-kernel.h
index 0a9b01137e..34e518d061 100644
--- a/tests/migration/aarch64/a-b-kernel.h
+++ b/tests/migration/aarch64/a-b-kernel.h
@@ -10,9 +10,9 @@ unsigned char aarch64_kernel[] = {
   0x03, 0x00, 0x80, 0x52, 0xe4, 0x03, 0x00, 0xaa, 0x83, 0x00, 0x00, 0x39,
   0x84, 0x04, 0x40, 0x91, 0x9f, 0x00, 0x01, 0xeb, 0xad, 0xff, 0xff, 0x54,
   0x05, 0x00, 0x80, 0x52, 0xe4, 0x03, 0x00, 0xaa, 0x83, 0x00, 0x40, 0x39,
-  0x63, 0x04, 0x00, 0x11, 0x63, 0x1c, 0x00, 0x12, 0x83, 0x00, 0x00, 0x39,
-  0x24, 0x7e, 0x0b, 0xd5, 0x84, 0x04, 0x40, 0x91, 0x9f, 0x00, 0x01, 0xeb,
-  0x2b, 0xff, 0xff, 0x54, 0xa5, 0x04, 0x00, 0x11, 0xa5, 0x1c, 0x00, 0x12,
-  0xbf, 0x00, 0x00, 0x71, 0x81, 0xfe, 0xff, 0x54, 0x43, 0x08, 0x80, 0x52,
-  0x43, 0x00, 0x00, 0x39, 0xf1, 0xff, 0xff, 0x17
+  0x63, 0x04, 0x00, 0x11, 0x83, 0x00, 0x00, 0x39, 0x24, 0x7e, 0x0b, 0xd5,
+  0x84, 0x04, 0x40, 0x91, 0x9f, 0x00, 0x01, 0xeb, 0x4b, 0xff, 0xff, 0x54,
+  0xa5, 0x04, 0x00, 0x11, 0xa5, 0x10, 0x00, 0x12, 0xbf, 0x00, 0x00, 0x71,
+  0xa1, 0xfe, 0xff, 0x54, 0x43, 0x08, 0x80, 0x52, 0x43, 0x00, 0x00, 0x39,
+  0xf2, 0xff, 0xff, 0x17
 };
diff --git a/tests/migration/aarch64/a-b-kernel.S b/tests/migration/aarch64/a-b-kernel.S
index 0225945348..a4103ecb71 100644
--- a/tests/migration/aarch64/a-b-kernel.S
+++ b/tests/migration/aarch64/a-b-kernel.S
@@ -53,7 +53,6 @@ innerloop:
         /* increment the first byte of each page by 1 */
         ldrb    w3, [x4]
         add     w3, w3, #1
-        and     w3, w3, #0xff
         strb    w3, [x4]
 
         /* make sure QEMU user space can see consistent data as MMU is off */
@@ -64,7 +63,7 @@ innerloop:
         blt     innerloop
 
         add     w5, w5, #1
-        and     w5, w5, #0xff
+        and     w5, w5, #0x1f
         cmp     w5, #0
         bne     mainloop
 
-- 
2.30.2