Suzuki K Poulose <[email protected]> writes:
> On 10/01/2018 04:54 PM, Punit Agrawal wrote:
>> KVM only supports PMD hugepages at stage 2. Now that the various page
>> handling routines are updated, extend the stage 2 fault handling to
>> map in PUD hugepages.
>>
>> Addition of PUD hugepage support enables additional page sizes (e.g.,
>> 1G with 4K granule) which can be useful on cores that support mapping
>> larger block sizes in the TLB entries.
>>
>> Signed-off-by: Punit Agrawal <[email protected]>
>> Cc: Christoffer Dall <[email protected]>
>> Cc: Marc Zyngier <[email protected]>
>> Cc: Russell King <[email protected]>
>> Cc: Catalin Marinas <[email protected]>
>> Cc: Will Deacon <[email protected]>
>> ---
>> arch/arm/include/asm/kvm_mmu.h | 20 +++++
>> arch/arm/include/asm/stage2_pgtable.h | 9 +++
>> arch/arm64/include/asm/kvm_mmu.h | 16 ++++
>> arch/arm64/include/asm/pgtable-hwdef.h | 2 +
>> arch/arm64/include/asm/pgtable.h | 2 +
>> virt/kvm/arm/mmu.c | 106 +++++++++++++++++++++++--
>> 6 files changed, 149 insertions(+), 6 deletions(-)
>>
>
> ...
>
>> diff --git a/arch/arm/include/asm/stage2_pgtable.h
>> b/arch/arm/include/asm/stage2_pgtable.h
>> index f6a7ea805232..a4ec25360e50 100644
>> --- a/arch/arm/include/asm/stage2_pgtable.h
>> +++ b/arch/arm/include/asm/stage2_pgtable.h
>> @@ -68,4 +68,13 @@ stage2_pmd_addr_end(struct kvm *kvm, phys_addr_t addr,
>> phys_addr_t end)
>> #define stage2_pmd_table_empty(kvm, pmdp) kvm_page_empty(pmdp)
>> #define stage2_pud_table_empty(kvm, pudp) false
>> +static inline bool kvm_stage2_has_pud(struct kvm *kvm)
>> +{
>> +#if CONFIG_PGTABLE_LEVELS > 3
>> + return true;
>> +#else
>> + return false;
>> +#endif
>
> nit: We can only have PGTABLE_LEVELS=3 on ARM with LPAE.
> AFAIT, this can be set to false always for ARM.
I debated this and veered towards being generic but not committed either
ways.
I've updated this locally but will wait for further comments before
re-posting.
>
>> +}
>> +
>
> ...
>
>> @@ -1669,7 +1752,18 @@ static int user_mem_abort(struct kvm_vcpu *vcpu,
>> phys_addr_t fault_ipa,
>> needs_exec = exec_fault ||
>> (fault_status == FSC_PERM && stage2_is_exec(kvm, fault_ipa));
>> - if (hugetlb && vma_pagesize == PMD_SIZE) {
>> + if (hugetlb && vma_pagesize == PUD_SIZE) {
>> + pud_t new_pud = kvm_pfn_pud(pfn, mem_type);
>> +
>> + new_pud = kvm_pud_mkhuge(new_pud);
>> + if (writable)
>> + new_pud = kvm_s2pud_mkwrite(new_pud);
>> +
>> + if (needs_exec)
>> + new_pud = kvm_s2pud_mkexec(new_pud);
>> +
>> + ret = stage2_set_pud_huge(kvm, memcache, fault_ipa, &new_pud);
>> + } else if (hugetlb && vma_pagesize == PMD_SIZE) {
>> pmd_t new_pmd = kvm_pfn_pmd(pfn, mem_type);
>> new_pmd = kvm_pmd_mkhuge(new_pmd);
>>
>
>
> Reviewed-by: Suzuki K Poulose <[email protected]>
Thanks a lot for going through the series.
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