diff options
| author | Anshuman Khandual <anshuman.khandual@arm.com> | 2020-05-12 07:27:27 +0530 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2020-05-20 15:59:23 +0100 |
| commit | c73433fc630cda102f6527d4e5dfd289a9baec08 (patch) | |
| tree | 74f7dec4356f79cdea99be5dfde31134e8bf6497 /arch/arm64/include | |
| parent | eeb2d87ece1219cff33e5107c2a6d57803354d15 (diff) | |
| download | linux-c73433fc630cda102f6527d4e5dfd289a9baec08.tar.bz2 | |
arm64/cpufeature: Validate hypervisor capabilities during CPU hotplug
This validates hypervisor capabilities like VMID width, IPA range for any
hot plug CPU against system finalized values. KVM's view of the IPA space
is used while allowing a given CPU to come up. While here, it factors out
get_vmid_bits() for general use.
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: James Morse <james.morse@arm.com>
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: kvmarm@lists.cs.columbia.edu
Cc: linux-kernel@vger.kernel.org
Suggested-by: Suzuki Poulose <suzuki.poulose@arm.com>
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Reviewed-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/1589248647-22925-1-git-send-email-anshuman.khandual@arm.com
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'arch/arm64/include')
| -rw-r--r-- | arch/arm64/include/asm/cpufeature.h | 18 | ||||
| -rw-r--r-- | arch/arm64/include/asm/kvm_mmu.h | 2 |
2 files changed, 19 insertions, 1 deletions
diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h index f5c4672e498b..928814d35669 100644 --- a/arch/arm64/include/asm/cpufeature.h +++ b/arch/arm64/include/asm/cpufeature.h @@ -752,6 +752,24 @@ static inline bool cpu_has_hw_af(void) extern bool cpu_has_amu_feat(int cpu); #endif +static inline unsigned int get_vmid_bits(u64 mmfr1) +{ + int vmid_bits; + + vmid_bits = cpuid_feature_extract_unsigned_field(mmfr1, + ID_AA64MMFR1_VMIDBITS_SHIFT); + if (vmid_bits == ID_AA64MMFR1_VMIDBITS_16) + return 16; + + /* + * Return the default here even if any reserved + * value is fetched from the system register. + */ + return 8; +} + +u32 get_kvm_ipa_limit(void); + #endif /* __ASSEMBLY__ */ #endif diff --git a/arch/arm64/include/asm/kvm_mmu.h b/arch/arm64/include/asm/kvm_mmu.h index 30b0e8d6b895..a7137e144b97 100644 --- a/arch/arm64/include/asm/kvm_mmu.h +++ b/arch/arm64/include/asm/kvm_mmu.h @@ -416,7 +416,7 @@ static inline unsigned int kvm_get_vmid_bits(void) { int reg = read_sanitised_ftr_reg(SYS_ID_AA64MMFR1_EL1); - return (cpuid_feature_extract_unsigned_field(reg, ID_AA64MMFR1_VMIDBITS_SHIFT) == 2) ? 16 : 8; + return get_vmid_bits(reg); } /* |