Commit 39930695 authored by Steven Price's avatar Steven Price Committed by Catalin Marinas
Browse files

arm64: realm: Query IPA size from the RMM 



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: default avatarCatalin Marinas <catalin.marinas@arm.com>
Reviewed-by: default avatarGavin Shan <gshan@redhat.com>
Co-developed-by: default avatarSuzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: default avatarSuzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: default avatarSteven Price <steven.price@arm.com>
Link: https://lore.kernel.org/r/20241017131434.40935-4-steven.price@arm.com


Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
parent c077711f

arch/arm64/include/asm/pgtable-prot.h

+4 −0
Original line number Diff line number Diff line
@@ -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)

arch/arm64/kernel/rsi.c

+8 −0
Original line number Diff line number Diff line
@@ -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();