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ANDROID: arm64: Register earlycon fixmap with the MMIO guard

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On initialising the MMIO guard infrastructure, register the
earlycon mapping if present.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Bug: 209580772
Change-Id: I379387253d08e2414fa386a3360a45391da7d90d
Signed-off-by: Will Deacon <willdeacon@google.com>
This commit is contained in:
Marc Zyngier
2021-07-01 09:34:12 +01:00
committed by Will Deacon
parent f6edd58a0c
commit ec2585f588
1 changed files with 12 additions and 0 deletions
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12
arch/arm64/mm/ioremap.c
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@@ -39,6 +39,17 @@ static int __init ioremap_guard_setup(char *str)
}
early_param("ioremap_guard", ioremap_guard_setup);
static void fixup_fixmap(void)
{
pte_t *ptep = __get_fixmap_pte(FIX_EARLYCON_MEM_BASE);
if (!ptep)
return;
ioremap_phys_range_hook(__pte_to_phys(*ptep), PAGE_SIZE,
__pgprot(pte_val(*ptep) & PTE_ATTRINDX_MASK));
}
void kvm_init_ioremap_services(void)
{
struct arm_smccc_res res;
@@ -62,6 +73,7 @@ void kvm_init_ioremap_services(void)
&res);
if (res.a0 == SMCCC_RET_SUCCESS) {
static_branch_enable(&ioremap_guard_key);
fixup_fixmap();
pr_info("Using KVM MMIO guard for ioremap\n");
} else {
pr_warn("KVM MMIO guard registration failed (%ld)\n", res.a0);