[QUESTION] How to run 16K page kernel with qemu

[Wenchao Hao]

Hi all:

I am trying to run ARM64 16K kernel on qemu, but failed.

I run a narmal 4K kernel on qemu at first with following steps:
1. cloning latest linux code
2. using default config and build kernel
   (wd: path where I cloned the linux code)
   make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- defconfig
   make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- -j 16
3. run the built kernel with following command:
   qemu-system-aarch64 -cpu cortex-a72 -m 4G -nographic \
           -machine virt,usb=off,dump-guest-core=off,gic-version=2 \
           -kernel arch/arm64/boot/Image
The kernel can be booted successfully with above steps, but halt when trying to
mount a rootfs, it does not matter to me.

Then I enabled CONFIG_ARM64_16K_PAGES then build the kernel again:
1. change the config and build again
   sed -i 's/default ARM64_4K_PAGES/default ARM64_16K_PAGES/' arch/arm64/Kconfig
   make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- defconfig
   make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- -j 16
2. run the built kernel with following command:
   qemu-system-aarch64 -cpu cortex-a72 -m 4G -nographic \
          -machine virt,usb=off,dump-guest-core=off,gic-version=2 \
          -kernel arch/arm64/boot/Image
But I failed to boot the 16K kernel, no log printed.

Following is some related config:

CONFIG_ARM64=y
CONFIG_ARM64_PAGE_SHIFT=14
CONFIG_ARM64_CONT_PTE_SHIFT=7
CONFIG_ARM64_CONT_PMD_SHIFT=5
CONFIG_ARM64_VA_BITS_48=y
CONFIG_ARM64_VA_BITS=48
CONFIG_PGTABLE_LEVELS=4

Is anyone help to point out how to run ARM64 16K pages kernel? Or is there
any doc about it? Did I miss any critical changes?

Thanks.