diff options
| author | Vladimir Murzin <vladimir.murzin@arm.com> | 2015-11-16 11:28:18 +0000 |
|---|---|---|
| committer | Marc Zyngier <marc.zyngier@arm.com> | 2015-12-18 10:15:12 +0000 |
| commit | 20475f784d29991b3b843c80c38a36f2ebb35ac4 (patch) | |
| tree | fce9116aeb5f04122e323a240daeb5a018feb360 /arch/arm64/include/asm/kvm_mmu.h | |
| parent | 8420dcd37ef34040c8fc5a27bf66887b3b2faf80 (diff) | |
arm64: KVM: Add support for 16-bit VMID
The ARMv8.1 architecture extension allows to choose between 8-bit and
16-bit of VMID, so use this capability for KVM.
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'arch/arm64/include/asm/kvm_mmu.h')
| -rw-r--r-- | arch/arm64/include/asm/kvm_mmu.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/kvm_mmu.h b/arch/arm64/include/asm/kvm_mmu.h index 54cba803e2d9..0bf8b4320a91 100644 --- a/arch/arm64/include/asm/kvm_mmu.h +++ b/arch/arm64/include/asm/kvm_mmu.h @@ -20,6 +20,7 @@ #include <asm/page.h> #include <asm/memory.h> +#include <asm/cpufeature.h> /* * As we only have the TTBR0_EL2 register, we cannot express @@ -301,5 +302,12 @@ static inline void __kvm_extend_hypmap(pgd_t *boot_hyp_pgd, merged_hyp_pgd[idmap_idx] = __pgd(__pa(boot_hyp_pgd) | PMD_TYPE_TABLE); } +static inline unsigned int kvm_get_vmid_bits(void) +{ + int reg = read_system_reg(SYS_ID_AA64MMFR1_EL1); + + return (cpuid_feature_extract_field(reg, ID_AA64MMFR1_VMIDBITS_SHIFT) == 2) ? 16 : 8; +} + #endif /* __ASSEMBLY__ */ #endif /* __ARM64_KVM_MMU_H__ */ |