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| author | Oliver Upton <oliver.upton@linux.dev> | 2022-11-07 21:56:36 +0000 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2022-11-10 14:43:46 +0000 |
| commit | 6b91b8f95cadd3441c056182daf9024475ac4a91 (patch) | |
| tree | 47c413fa22c1b28e5c4143494ad5895a7aff487d /arch/arm64/include/asm/kvm_pgtable.h | |
| parent | 8e94e1252cc054bb31fd3e9a15235cd831970ec1 (diff) | |
| download | linux-6b91b8f95cadd3441c056182daf9024475ac4a91.tar.gz linux-6b91b8f95cadd3441c056182daf9024475ac4a91.tar.bz2 linux-6b91b8f95cadd3441c056182daf9024475ac4a91.zip | |
KVM: arm64: Use an opaque type for pteps
Use an opaque type for pteps and require visitors explicitly dereference
the pointer before using. Protecting page table memory with RCU requires
that KVM dereferences RCU-annotated pointers before using. However, RCU
is not available for use in the nVHE hypervisor and the opaque type can
be conditionally annotated with RCU for the stage-2 MMU.
Call the type a 'pteref' to avoid a naming collision with raw pteps. No
functional change intended.
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20221107215644.1895162-7-oliver.upton@linux.dev
Diffstat (limited to 'arch/arm64/include/asm/kvm_pgtable.h')
| -rw-r--r-- | arch/arm64/include/asm/kvm_pgtable.h | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/arch/arm64/include/asm/kvm_pgtable.h b/arch/arm64/include/asm/kvm_pgtable.h index 93b1feeaebab..cbd2851eefc1 100644 --- a/arch/arm64/include/asm/kvm_pgtable.h +++ b/arch/arm64/include/asm/kvm_pgtable.h @@ -37,6 +37,13 @@ static inline u64 kvm_get_parange(u64 mmfr0) typedef u64 kvm_pte_t; +typedef kvm_pte_t *kvm_pteref_t; + +static inline kvm_pte_t *kvm_dereference_pteref(kvm_pteref_t pteref, bool shared) +{ + return pteref; +} + #define KVM_PTE_VALID BIT(0) #define KVM_PTE_ADDR_MASK GENMASK(47, PAGE_SHIFT) @@ -175,7 +182,7 @@ typedef bool (*kvm_pgtable_force_pte_cb_t)(u64 addr, u64 end, struct kvm_pgtable { u32 ia_bits; u32 start_level; - kvm_pte_t *pgd; + kvm_pteref_t pgd; struct kvm_pgtable_mm_ops *mm_ops; /* Stage-2 only */ |