qemu: Allow native and nativesdk versions on Linux older then 4.17

Linux kernel 4.17 introduced two new mmap flags, MAP_FIXED_NOREPLACE and
MAP_SHARED_VALIDATE.  Starting with QEMU 8.1, these flags are now used
and required for proper system operation.  In order to build and run on a
system older then 4.17, we need to emulate this new behavior.

Not having a newer kernel could result in the mmap memory being allocated
in a way that will cause failures without QEMU checking for these
conditions.  Note, memory allocation issues are rare in my experience so
this is more of a 'just-in-case' behavior.

SDK_OLDEST_KERNEL is currently set to 3.2.0, the only way this can claim
that qemu works in an SDK is by checking the return values to emulate
the expected behavior.

(From OE-Core rev: 4eb0a83c7851e2eb6d7890a130dfe50f37ff8ac9)

Signed-off-by: Mark Hatle <mark.hatle@amd.com>
Signed-off-by: Mark Hatle <mark.hatle@kernel.crashing.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 12 insertions, 0 deletions

diff --git a/meta/recipes-devtools/qemu/qemu.inc b/meta/recipes-devtools/qemu/qemu.inc
index bc6ce0bb38..14b975db30 100644
--- a/meta/recipes-devtools/qemu/qemu.inc
+++ b/meta/recipes-devtools/qemu/qemu.inc
@@ -40,6 +40,18 @@ SRC_URI = "https://download.qemu.org/${BPN}-${PV}.tar.xz \
            "
 UPSTREAM_CHECK_REGEX = "qemu-(?P<pver>\d+(\.\d+)+)\.tar"
 
+# SDK_OLDEST_KERNEL is set below 4.17, which is the minimum version required by QEMU >= 8.1
+# This is due to two MMAP flags being used at certain points
+SRC_URI:append:class-nativesdk = " \
+        file://0011-linux-user-workaround-for-missing-MAP_FIXED_NOREPLAC.patch \
+        file://0012-linux-user-workaround-for-missing-MAP_SHARED_VALIDAT.patch \
+        "
+
+# Support building and using native version on pre 4.17 kernels
+SRC_URI:append:class-native = " \
+        file://0011-linux-user-workaround-for-missing-MAP_FIXED_NOREPLAC.patch \
+        file://0012-linux-user-workaround-for-missing-MAP_SHARED_VALIDAT.patch \
+        "
 
 SRC_URI[sha256sum] = "bf00d2fa12010df8b0ade93371def58e632cb32a6bfdc5f5a0ff8e6a1fb1bf32"