[Xen-devel] [PATCH v2 2/2] xen: arm: flush dcache while preparing the device tree for Dom0

[Oleksandr Dmytryshyn <oleksandr.dmytryshyn@xxxxxxxxxxxxxxx>]

Without flushing dcache the hypervisor couldn't copy the device tree
correctly when booting the kernel dom0 Image (memory with device tree
is corrupted). As the result - when we try to load the kernel dom0
Image - dom0 hungs frequently. This issue is not reproduced with the
kernel dom0 zImage because the zImage decompressor code flushes all
dcache before starting the decompressed kernel Image. When the
hypervisor loads the kernel image or initrd, this memory region
isn't corrupted because the hypervisor code flushes the dcache.

Signed-off-by: Oleksandr Dmytryshyn <oleksandr.dmytryshyn@xxxxxxxxxxxxxxx>
---
 xen/arch/arm/domain_build.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index e9bb01f..99e785a 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -906,7 +906,8 @@ static void dtb_load(struct kernel_info *kinfo)
     printk("Loading dom0 DTB to 0x%"PRIpaddr"-0x%"PRIpaddr"\n",
            kinfo->dtb_paddr, kinfo->dtb_paddr + fdt_totalsize(kinfo->fdt));
 
-    rc = raw_copy_to_guest(dtb_virt, kinfo->fdt, fdt_totalsize(kinfo->fdt));
+    rc = raw_copy_to_guest_flush_dcache(dtb_virt, kinfo->fdt,
+                                        fdt_totalsize(kinfo->fdt));
     if ( rc != 0 )
         panic("Unable to copy the DTB to dom0 memory (rc = %lu)\n", rc);
     xfree(kinfo->fdt);
-- 
1.8.2.rc2


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