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Subject[PATCH v9 7/8] KVM: arm64: Update age handlers to support PUD hugepages
Date
In preparation for creating larger hugepages at Stage 2, add support
to the age handling notifiers for PUD hugepages when encountered.

Provide trivial helpers for arm32 to allow sharing code.

Signed-off-by: Punit Agrawal <punit.agrawal@arm.com>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Cc: Christoffer Dall <christoffer.dall@arm.com>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
---
arch/arm/include/asm/kvm_mmu.h | 6 +++++
arch/arm64/include/asm/kvm_mmu.h | 5 ++++
arch/arm64/include/asm/pgtable.h | 1 +
virt/kvm/arm/mmu.c | 39 ++++++++++++++++----------------
4 files changed, 32 insertions(+), 19 deletions(-)

diff --git a/arch/arm/include/asm/kvm_mmu.h b/arch/arm/include/asm/kvm_mmu.h
index fea5e723e3ac..e62f0913ce7d 100644
--- a/arch/arm/include/asm/kvm_mmu.h
+++ b/arch/arm/include/asm/kvm_mmu.h
@@ -117,6 +117,12 @@ static inline pud_t kvm_s2pud_mkyoung(pud_t pud)
return pud;
}

+static inline bool kvm_s2pud_young(pud_t pud)
+{
+ BUG();
+ return false;
+}
+
static inline pte_t kvm_s2pte_mkwrite(pte_t pte)
{
pte_val(pte) |= L_PTE_S2_RDWR;
diff --git a/arch/arm64/include/asm/kvm_mmu.h b/arch/arm64/include/asm/kvm_mmu.h
index 612032bbb428..9f941f70775c 100644
--- a/arch/arm64/include/asm/kvm_mmu.h
+++ b/arch/arm64/include/asm/kvm_mmu.h
@@ -273,6 +273,11 @@ static inline pud_t kvm_s2pud_mkyoung(pud_t pud)
return pud_mkyoung(pud);
}

+static inline bool kvm_s2pud_young(pud_t pud)
+{
+ return pud_young(pud);
+}
+
#define hyp_pte_table_empty(ptep) kvm_page_empty(ptep)

#ifdef __PAGETABLE_PMD_FOLDED
diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index f51e2271e6a3..bb0f3f17a7a9 100644
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h
@@ -386,6 +386,7 @@ static inline int pmd_protnone(pmd_t pmd)
#define pfn_pmd(pfn,prot) __pmd(__phys_to_pmd_val((phys_addr_t)(pfn) << PAGE_SHIFT) | pgprot_val(prot))
#define mk_pmd(page,prot) pfn_pmd(page_to_pfn(page),prot)

+#define pud_young(pud) pte_young(pud_pte(pud))
#define pud_mkyoung(pud) pte_pud(pte_mkyoung(pud_pte(pud)))
#define pud_write(pud) pte_write(pud_pte(pud))

diff --git a/virt/kvm/arm/mmu.c b/virt/kvm/arm/mmu.c
index bd749601195f..3893ea6a50bf 100644
--- a/virt/kvm/arm/mmu.c
+++ b/virt/kvm/arm/mmu.c
@@ -1225,6 +1225,11 @@ static int stage2_pmdp_test_and_clear_young(pmd_t *pmd)
return stage2_ptep_test_and_clear_young((pte_t *)pmd);
}

+static int stage2_pudp_test_and_clear_young(pud_t *pud)
+{
+ return stage2_ptep_test_and_clear_young((pte_t *)pud);
+}
+
/**
* kvm_phys_addr_ioremap - map a device range to guest IPA
*
@@ -1932,42 +1937,38 @@ void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte)

static int kvm_age_hva_handler(struct kvm *kvm, gpa_t gpa, u64 size, void *data)
{
+ pud_t *pud;
pmd_t *pmd;
pte_t *pte;

- WARN_ON(size != PAGE_SIZE && size != PMD_SIZE);
- pmd = stage2_get_pmd(kvm, NULL, gpa);
- if (!pmd || pmd_none(*pmd)) /* Nothing there */
+ WARN_ON(size != PAGE_SIZE && size != PMD_SIZE && size != PUD_SIZE);
+ if (!stage2_get_leaf_entry(kvm, gpa, &pud, &pmd, &pte))
return 0;

- if (pmd_thp_or_huge(*pmd)) /* THP, HugeTLB */
+ if (pud)
+ return stage2_pudp_test_and_clear_young(pud);
+ else if (pmd)
return stage2_pmdp_test_and_clear_young(pmd);
-
- pte = pte_offset_kernel(pmd, gpa);
- if (pte_none(*pte))
- return 0;
-
- return stage2_ptep_test_and_clear_young(pte);
+ else
+ return stage2_ptep_test_and_clear_young(pte);
}

static int kvm_test_age_hva_handler(struct kvm *kvm, gpa_t gpa, u64 size, void *data)
{
+ pud_t *pud;
pmd_t *pmd;
pte_t *pte;

- WARN_ON(size != PAGE_SIZE && size != PMD_SIZE);
- pmd = stage2_get_pmd(kvm, NULL, gpa);
- if (!pmd || pmd_none(*pmd)) /* Nothing there */
+ WARN_ON(size != PAGE_SIZE && size != PMD_SIZE && size != PUD_SIZE);
+ if (!stage2_get_leaf_entry(kvm, gpa, &pud, &pmd, &pte))
return 0;

- if (pmd_thp_or_huge(*pmd)) /* THP, HugeTLB */
+ if (pud)
+ return kvm_s2pud_young(*pud);
+ else if (pmd)
return pmd_young(*pmd);
-
- pte = pte_offset_kernel(pmd, gpa);
- if (!pte_none(*pte)) /* Just a page... */
+ else
return pte_young(*pte);
-
- return 0;
}

int kvm_age_hva(struct kvm *kvm, unsigned long start, unsigned long end)
--
2.19.1
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