| From | Steven Price <> | Subject | [RFC PATCH 08/14] arm64: Make the PHYS_MASK_SHIFT dynamic | Date | Fri, 27 Jan 2023 11:27:52 +0000 |
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Make the PHYS_MASK_SHIFT dynamic for Realms. This is only is required for masking the PFN from a pte entry. Elsewhere, we could still use the PA bits configured by the kernel. So, this patch:
-> renames PHYS_MASK_SHIFT -> MAX_PHYS_SHIFT as supported by the kernel -> Makes PHYS_MASK_SHIFT -> Dynamic value of the (I)PA bit width -> For a realm: reduces phys_mask_shift if the RMM reports a smaller configured size for the guest.
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> --- arch/arm64/include/asm/kvm_arm.h | 2 +- arch/arm64/include/asm/pgtable-hwdef.h | 4 ++-- arch/arm64/include/asm/pgtable.h | 5 +++++ arch/arm64/kernel/head.S | 2 +- arch/arm64/kernel/rsi.c | 5 +++++ 5 files changed, 14 insertions(+), 4 deletions(-)
diff --git a/arch/arm64/include/asm/kvm_arm.h b/arch/arm64/include/asm/kvm_arm.h index 0df3fc3a0173..924f84024009 100644 --- a/arch/arm64/include/asm/kvm_arm.h +++ b/arch/arm64/include/asm/kvm_arm.h @@ -346,7 +346,7 @@ * bits in PAR are res0. */ #define PAR_TO_HPFAR(par) \ - (((par) & GENMASK_ULL(52 - 1, 12)) >> 8) + (((par) & GENMASK_ULL(MAX_PHYS_MASK_SHIFT - 1, 12)) >> 8) #define ECN(x) { ESR_ELx_EC_##x, #x } diff --git a/arch/arm64/include/asm/pgtable-hwdef.h b/arch/arm64/include/asm/pgtable-hwdef.h index f658aafc47df..677bf7a91616 100644 --- a/arch/arm64/include/asm/pgtable-hwdef.h +++ b/arch/arm64/include/asm/pgtable-hwdef.h @@ -178,8 +178,8 @@ /* * Highest possible physical address supported. */ -#define PHYS_MASK_SHIFT (CONFIG_ARM64_PA_BITS) -#define PHYS_MASK ((UL(1) << PHYS_MASK_SHIFT) - 1) +#define MAX_PHYS_MASK_SHIFT (CONFIG_ARM64_PA_BITS) +#define MAX_PHYS_MASK ((UL(1) << PHYS_MASK_SHIFT) - 1) #define TTBR_CNP_BIT (UL(1) << 0) diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h index b4bbeed80fb6..a1319a743b38 100644 --- a/arch/arm64/include/asm/pgtable.h +++ b/arch/arm64/include/asm/pgtable.h @@ -35,6 +35,11 @@ #include <linux/sched.h> #include <linux/page_table_check.h> +extern unsigned int phys_mask_shift; + +#define PHYS_MASK_SHIFT (phys_mask_shift) +#define PHYS_MASK ((1UL << PHYS_MASK_SHIFT) - 1) + #ifdef CONFIG_TRANSPARENT_HUGEPAGE #define __HAVE_ARCH_FLUSH_PMD_TLB_RANGE diff --git a/arch/arm64/kernel/head.S b/arch/arm64/kernel/head.S index 952e17bd1c0b..a05504667b69 100644 --- a/arch/arm64/kernel/head.S +++ b/arch/arm64/kernel/head.S @@ -321,7 +321,7 @@ SYM_FUNC_START_LOCAL(create_idmap) #error "Mismatch between VA_BITS and page size/number of translation levels" #endif #else -#define IDMAP_PGD_ORDER (PHYS_MASK_SHIFT - PGDIR_SHIFT) +#define IDMAP_PGD_ORDER (MAX_PHYS_MASK_SHIFT - PGDIR_SHIFT) #define EXTRA_SHIFT /* * If VA_BITS == 48, we don't have to configure an additional diff --git a/arch/arm64/kernel/rsi.c b/arch/arm64/kernel/rsi.c index 9c63ee1c6979..49d36dfe0064 100644 --- a/arch/arm64/kernel/rsi.c +++ b/arch/arm64/kernel/rsi.c @@ -12,6 +12,8 @@ struct realm_config __attribute((aligned(PAGE_SIZE))) config; unsigned long prot_ns_shared; EXPORT_SYMBOL(prot_ns_shared); +unsigned int phys_mask_shift = CONFIG_ARM64_PA_BITS; + DEFINE_STATIC_KEY_FALSE_RO(rsi_present); static bool rsi_version_matches(void) @@ -54,5 +56,8 @@ void __init arm64_rsi_init(void) return; prot_ns_shared = BIT(config.ipa_bits - 1); + if (config.ipa_bits - 1 < phys_mask_shift) + phys_mask_shift = config.ipa_bits - 1; + static_branch_enable(&rsi_present); } -- 2.34.1
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