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x86/boot: Add setup_indirect support in early_memremap_is_setup_data()

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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: b3c72fc9a7 ("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
This commit is contained in:
Ross Philipson 2022-02-23 21:07:36 -05:00 committed by Borislav Petkov
parent 7228918b34
commit 445c1470b6
1 changed files with 31 additions and 2 deletions
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31
arch/x86/mm/ioremap.c
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@ -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;
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;