x86/boot: Add setup_indirect support in early_memremap_is_setup_data()

The x86 boot documentation describes the setup_indirect structures and
how they are used. Only one of the two functions in ioremap.c that needed
to be modified to be aware of the introduction of setup_indirect
functionality was updated. Adds comparable support to the other function
where it was missing.

Fixes: b3c72fc ("x86/boot: Introduce setup_indirect")
Signed-off-by: Ross Philipson <ross.philipson@oracle.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/1645668456-22036-3-git-send-email-ross.philipson@oracle.com

arch/x86/mm/ioremap.c

@@ -676,22 +676,51 @@ static bool memremap_is_setup_data(resource_size_t phys_addr,
 static bool __init early_memremap_is_setup_data(resource_size_t phys_addr,
  unsigned long size)
 {
+ struct setup_indirect *indirect;
  struct setup_data *data;
  u64 paddr, paddr_next;
 
  paddr = boot_params.hdr.setup_data;
  while (paddr) {
- unsigned int len;
+ unsigned int len, size;
 
  if (phys_addr == paddr)
  return true;
 
  data = early_memremap_decrypted(paddr, sizeof(*data));
+ if (!data) {
+ pr_warn("failed to early memremap setup_data entry\n");
+ return false;
+ }
+
+ size = sizeof(*data);
 
  paddr_next = data->next;
  len = data->len;
 
- early_memunmap(data, sizeof(*data));
+ if ((phys_addr > paddr) && (phys_addr < (paddr + len))) {
+ early_memunmap(data, sizeof(*data));
+ return true;
+ }
+
+ if (data->type == SETUP_INDIRECT) {
+ size += len;
+ early_memunmap(data, sizeof(*data));
+ data = early_memremap_decrypted(paddr, size);
+ if (!data) {
+ pr_warn("failed to early memremap indirect setup_data\n");
+ return false;
+ }
+
+ indirect = (struct setup_indirect *)data->data;
+
+ if (indirect->type != SETUP_INDIRECT) {
+ paddr = indirect->addr;
+ len = indirect->len;
+ }
+ }
+
+ early_memunmap(data, size);
 
  if ((phys_addr > paddr) && (phys_addr < (paddr + len)))
  return true;