[PATCH v3 18/26] hw/arm/boot: Mark all guest memory as RIPAS_RAM.

[Jean-Philippe Brucker]

All Realm IPA states are by default RIPAS_EMPTY, and accessing them in
that state causes injection of synchronous exception. Either the loader
or the guest needs to set IPA state to RIPAS_RAM before accessing it.
Since a Linux guest needs all memory ready at boot [1], initialize it
here.

[1] https://docs.kernel.org/arch/arm64/booting.html
    https://lore.kernel.org/all/20241004144307.66199-12-steven.price@arm.com/

Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
---
v2->v3: New: the Linux guest does not initialize RIPAS itself anymore,
and expects the loader to do it.
---
 hw/arm/boot.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/hw/arm/boot.c b/hw/arm/boot.c
index 5301d8d318..a2414b1f98 100644
--- a/hw/arm/boot.c
+++ b/hw/arm/boot.c
@@ -26,6 +26,7 @@
 #include "qemu/config-file.h"
 #include "qemu/option.h"
 #include "qemu/units.h"
+#include "kvm_arm.h"
 
 /* Kernel boot protocol is specified in the kernel docs
  * Documentation/arm/Booting and Documentation/arm64/booting.txt
@@ -1238,6 +1239,9 @@ void arm_load_kernel(ARMCPU *cpu, MachineState *ms, 
struct arm_boot_info *info)
     info->dtb_filename = ms->dtb;
     info->dtb_limit = 0;
 
+    /* Mark all Realm memory as RAM */
+    kvm_arm_rme_init_guest_ram(info->loader_start, info->ram_size);
+
     /* Load the kernel.  */
     if (!info->kernel_filename || info->firmware_loaded) {
         arm_setup_firmware_boot(cpu, info);
-- 
2.47.0