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arm64: realm: Query IPA size from the RMM

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The top bit of the configured IPA size is used as an attribute to
control whether the address is protected or shared. Query the
configuration from the RMM to assertain which bit this is.

Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Gavin Shan <gshan@redhat.com>
Co-developed-by: Suzuki K Poulose <suzuki.poulose@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/20241017131434.40935-4-steven.price@arm.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Steven Price
2024-10-17 14:14:26 +01:00
committed by Catalin Marinas
parent c077711f71
commit 3993069549
2 changed files with 12 additions and 0 deletions
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4
arch/arm64/include/asm/pgtable-prot.h
View File

@@ -68,8 +68,12 @@
#include <asm/cpufeature.h>
#include <asm/pgtable-types.h>
#include <asm/rsi.h>
extern bool arm64_use_ng_mappings;
extern unsigned long prot_ns_shared;
#define PROT_NS_SHARED (is_realm_world() ? prot_ns_shared : 0)
#define PTE_MAYBE_NG (arm64_use_ng_mappings ? PTE_NG : 0)
#define PMD_MAYBE_NG (arm64_use_ng_mappings ? PMD_SECT_NG : 0)

8
arch/arm64/kernel/rsi.c
View File

@@ -8,6 +8,11 @@
#include <linux/psci.h>
#include <asm/rsi.h>
static struct realm_config config;
unsigned long prot_ns_shared;
EXPORT_SYMBOL(prot_ns_shared);
DEFINE_STATIC_KEY_FALSE_RO(rsi_present);
EXPORT_SYMBOL(rsi_present);
@@ -68,6 +73,9 @@ void __init arm64_rsi_init(void)
return;
if (!rsi_version_matches())
return;
if (WARN_ON(rsi_get_realm_config(&config)))
return;
prot_ns_shared = BIT(config.ipa_bits - 1);
arm64_rsi_setup_memory();