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+
+qemu aarch64 cannot boot linux kernel v4.6+
+
+Hi,
+I tested the latest qemu-system-aarch64 cannot boot linux mainline kernel since v4.6 from https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git.
+
+Environment info:
+# host
+ ubuntu 16.04
+# qemu
+ Master branch from git://git.qemu.org/qemu.git, and now the HEAD is c11d61271b9e6e7a1f0479ef1ca8fb55fa457a62.
+# build command
+ ./configure --target-list=aarch64-softmmu
+ make
+# qemu commmand
+ qemu-system-aarch64 -machine virt -cpu cortex-a57 -machine type=virt -smp 4 -m 1024 -nographic -s -kernel ~/workspace/linux/arch/arm64/boot/Image -device e1000,netdev=net0 -netdev user,id=net0,hostfwd=tcp::2222-:22
+
+Error info:
+ No error prompted, actually no any log which means I couldn't see the usually kernel boot message.
+
+Debug info:
+ I did a git bisect on linux, and found with this kernel commit, qemu failed to boot. Parent of 406e308770a92bd33995b2e5b681e86358328bb0 can boot.
+ commit 406e308770a92bd33995b2e5b681e86358328bb0
+    Author: James Morse <email address hidden>
+    Date:   Fri Feb 5 14:58:47 2016 +0000
+
+    arm64: add ARMv8.2 id_aa64mmfr2 boiler plate
+
+    ARMv8.2 adds a new feature register id_aa64mmfr2. This patch adds the
+    cpu feature boiler plate used by the actual features in later patches.
+
+    Signed-off-by: James Morse <email address hidden>
+    Reviewed-by: Suzuki K Poulose <email address hidden>
+    Signed-off-by: Catalin Marinas <email address hidden>
+ The main change in the patch is to add reg_id_aa64mmfr2 in to arch/arm64/include/asm/cpu.h, so might it be any struct change not included in qemu?
+
+Can you please help check how to fix it?
+
+Thanks
+
+- Joey
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