Commit 5e6dbe1e authored by Peter Maydell's avatar Peter Maydell
Browse files

hw/arm/boot: Honour image size field in AArch64 Image format kernels 

Since Linux v3.17, the kernel's Image header includes a field image_size,
which gives the total size of the kernel including unpopulated data
sections such as the BSS). If this is present, then return it from
load_aarch64_image() as the true size of the kernel rather than
just using the size of the Image file itself. This allows the code
which calculates where to put the initrd to avoid putting it in
the kernel's BSS area.

This means that we should be able to reliably load kernel images
which are larger than 128MB without accidentally putting the
initrd or dtb in locations that clash with the kernel itself.

Fixes: https://bugs.launchpad.net/qemu/+bug/1823998


Signed-off-by: default avatarPeter Maydell <peter.maydell@linaro.org>
Reviewed-by: default avatarRichard Henderson <richard.henderson@linaro.org>
Reviewed-by: default avatarAlex Bennée <alex.bennee@linaro.org>
Tested-by: default avatarMark Rutland <mark.rutland@arm.com>
Message-id: 20190516144733.32399-5-peter.maydell@linaro.org
parent e6b2b20d

hw/arm/boot.c

+15 −2
Original line number Diff line number Diff line
@@ -911,6 +911,7 @@ static uint64_t load_aarch64_image(const char *filename, hwaddr mem_base, 
                                   hwaddr *entry, AddressSpace *as)

{

    hwaddr kernel_load_offset = KERNEL64_LOAD_ADDR;

    uint64_t kernel_size = 0;

    uint8_t *buffer;

    int size;
@@ -938,7 +939,10 @@ static uint64_t load_aarch64_image(const char *filename, hwaddr mem_base, 
         * is only valid if the image_size is non-zero.

         */

        memcpy(&hdrvals, buffer + ARM64_TEXT_OFFSET_OFFSET, sizeof(hdrvals));

        if (hdrvals[1] != 0) {



        kernel_size = le64_to_cpu(hdrvals[1]);



        if (kernel_size != 0) {

            kernel_load_offset = le64_to_cpu(hdrvals[0]);



            /*
@@ -956,12 +960,21 @@ static uint64_t load_aarch64_image(const char *filename, hwaddr mem_base, 
        }

    }



    /*

     * Kernels before v3.17 don't populate the image_size field, and

     * raw images have no header. For those our best guess at the size

     * is the size of the Image file itself.

     */

    if (kernel_size == 0) {

        kernel_size = size;

    }



    *entry = mem_base + kernel_load_offset;

    rom_add_blob_fixed_as(filename, buffer, size, *entry, as);



    g_free(buffer);



    return size;

    return kernel_size;

}



static void arm_setup_direct_kernel_boot(ARMCPU *cpu,