[Qemu-devel] [PULL 5/5] hw/arm/boot: Further improve initrd positioning code

[Peter Maydell <peter.maydell@linaro.org>]

In commit e6b2b20d9735d4ef we made the boot loader code try to avoid
putting the initrd on top of the kernel.  However the expression used
to calculate the start of the initrd:

    info->initrd_start = info->loader_start +
        MAX(MIN(info->ram_size / 2, 128 * 1024 * 1024), kernel_size);

incorrectly uses 'kernel_size' as the offset within RAM of the
highest address to avoid.  This is incorrect because the kernel
doesn't start at address 0, but slightly higher than that.  This
means that we can still incorrectly end up overlaying the initrd on
the kernel in some cases, for example:

* The kernel's image_size is 0x0a7a8000
* The kernel was loaded at   0x40080000
* The end of the kernel is   0x4A828000
* The DTB was loaded at      0x4a800000

To get this right we need to track the actual highest address used
by the kernel and use that rather than kernel_size. We already
set image_low_addr and image_high_addr for ELF images; set them
also for the various other image types we support, and then use
image_high_addr as the lowest allowed address for the initrd.
(We don't use image_low_addr, but we set it for consistency
with the existing code path for ELF files.)

Fixes: e6b2b20d9735d4ef
Reported-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Tested-by: Mark Rutland <mark.rutland@arm.com>
Message-id: 20190722151804.25467-3-peter.maydell@linaro.org
---
 hw/arm/boot.c | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/hw/arm/boot.c b/hw/arm/boot.c
index b7b31753aca..c2b89b3bb9b 100644
--- a/hw/arm/boot.c
+++ b/hw/arm/boot.c
@@ -988,7 +988,7 @@ static void arm_setup_direct_kernel_boot(ARMCPU *cpu,
     int is_linux = 0;
     uint64_t elf_entry;
     /* Addresses of first byte used and first byte not used by the image */
-    uint64_t image_low_addr, image_high_addr;
+    uint64_t image_low_addr = 0, image_high_addr = 0;
     int elf_machine;
     hwaddr entry;
     static const ARMInsnFixup *primary_loader;
@@ -1041,17 +1041,29 @@ static void arm_setup_direct_kernel_boot(ARMCPU *cpu,
         uint64_t loadaddr = info->loader_start + KERNEL_NOLOAD_ADDR;
         kernel_size = load_uimage_as(info->kernel_filename, &entry, &loadaddr,
                                      &is_linux, NULL, NULL, as);
+        if (kernel_size >= 0) {
+            image_low_addr = loadaddr;
+            image_high_addr = image_low_addr + kernel_size;
+        }
     }
     if (arm_feature(&cpu->env, ARM_FEATURE_AARCH64) && kernel_size < 0) {
         kernel_size = load_aarch64_image(info->kernel_filename,
                                          info->loader_start, &entry, as);
         is_linux = 1;
+        if (kernel_size >= 0) {
+            image_low_addr = entry;
+            image_high_addr = image_low_addr + kernel_size;
+        }
     } else if (kernel_size < 0) {
         /* 32-bit ARM */
         entry = info->loader_start + KERNEL_LOAD_ADDR;
         kernel_size = load_image_targphys_as(info->kernel_filename, entry,
                                              ram_end - KERNEL_LOAD_ADDR, as);
         is_linux = 1;
+        if (kernel_size >= 0) {
+            image_low_addr = entry;
+            image_high_addr = image_low_addr + kernel_size;
+        }
     }
     if (kernel_size < 0) {
         error_report("could not load kernel '%s'", info->kernel_filename);
@@ -1083,7 +1095,10 @@ static void arm_setup_direct_kernel_boot(ARMCPU *cpu,
      * we might still make a bad choice here.
      */
     info->initrd_start = info->loader_start +
-        MAX(MIN(info->ram_size / 2, 128 * 1024 * 1024), kernel_size);
+        MIN(info->ram_size / 2, 128 * 1024 * 1024);
+    if (image_high_addr) {
+        info->initrd_start = MAX(info->initrd_start, image_high_addr);
+    }
     info->initrd_start = TARGET_PAGE_ALIGN(info->initrd_start);
 
     if (is_linux) {
-- 
2.20.1