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 <punit.agrawal@xxxxxxx>
Cc: Christoffer Dall <christoffer.dall@xxxxxxx>
Cc: Marc Zyngier <marc.zyngier@xxxxxxx>
Cc: Russell King <linux@xxxxxxxxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Will Deacon <will.deacon@xxxxxxx>
---
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.
+}
+
...
@@ -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 <suzuki.poulose@xxxxxxx>
_______________________________________________
kvmarm mailing list
kvmarm@xxxxxxxxxxxxxxxxxxxxx
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
