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arm64: rsi: Map unprotected MMIO as decrypted

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Instead of marking every MMIO as shared, check if the given region is
"Protected" and apply the permissions accordingly.

Reviewed-by: Gavin Shan <gshan@redhat.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Steven Price <steven.price@arm.com>
Link: https://lore.kernel.org/r/20241017131434.40935-6-steven.price@arm.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Suzuki K Poulose 2024-10-17 14:14:28 +01:00 committed by Catalin Marinas
parent 3715894376
commit 3c6c706139
1 changed files with 15 additions and 0 deletions
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15
arch/arm64/kernel/rsi.c
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@ -6,6 +6,8 @@
#include <linux/jump_label.h>
#include <linux/memblock.h>
#include <linux/psci.h>
#include <asm/io.h>
#include <asm/rsi.h>
static struct realm_config config;
@ -93,6 +95,16 @@ bool __arm64_is_protected_mmio(phys_addr_t base, size_t size)
}
EXPORT_SYMBOL(__arm64_is_protected_mmio);
static int realm_ioremap_hook(phys_addr_t phys, size_t size, pgprot_t *prot)
{
if (__arm64_is_protected_mmio(phys, size))
*prot = pgprot_encrypted(*prot);
else
*prot = pgprot_decrypted(*prot);
return 0;
}
void __init arm64_rsi_init(void)
{
if (arm_smccc_1_1_get_conduit() != SMCCC_CONDUIT_SMC)
@ -103,6 +115,9 @@ void __init arm64_rsi_init(void)
return;
prot_ns_shared = BIT(config.ipa_bits - 1);
if (arm64_ioremap_prot_hook_register(realm_ioremap_hook))
return;
arm64_rsi_setup_memory();
static_branch_enable(&rsi_present);