From: Suzuki K Poulose <suzuki.poulose@arm.com>
To: linux-arm-kernel@lists.infradead.org
Cc: suzuki.poulose@arm.com, linux-kernel@vger.kernel.org,
kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org,
marc.zyngier@arm.com, christoffer.dall@arm.com,
will.deacon@arm.com, catalin.marinas@arm.com,
anshuman.khandual@arm.com
Subject: [PATCH v10 7/8] KVM: arm64: Update age handlers to support PUD hugepages
Date: Tue, 11 Dec 2018 17:10:40 +0000 [thread overview]
Message-ID: <1544548241-6417-8-git-send-email-suzuki.poulose@arm.com> (raw)
In-Reply-To: <1544548241-6417-1-git-send-email-suzuki.poulose@arm.com>
From: Punit Agrawal <punit.agrawal@arm.com>
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>
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>
[ Replaced BUG() => WARN_ON(1) for arm32 PUD helpers ]
Signed-off-by: Suzuki K Poulose <suzuki.poulose@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 3a40720..4b4b214 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)
+{
+ WARN_ON(1);
+ 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 612032b..9f941f7 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 f51e227..bb0f3f1 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 bd74960..3893ea6 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)
--
2.7.4
next prev parent reply other threads:[~2018-12-11 17:12 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-11 17:10 [PATCH v10 0/8] kvm: arm64: Support PUD hugepage at stage 2 Suzuki K Poulose
2018-12-11 17:10 ` [PATCH v10 1/8] KVM: arm/arm64: Share common code in user_mem_abort() Suzuki K Poulose
2018-12-11 17:10 ` [PATCH v10 2/8] KVM: arm/arm64: Re-factor setting the Stage 2 entry to exec on fault Suzuki K Poulose
2018-12-11 17:10 ` [PATCH v10 3/8] KVM: arm/arm64: Introduce helpers to manipulate page table entries Suzuki K Poulose
2018-12-11 17:10 ` [PATCH v10 4/8] KVM: arm64: Support dirty page tracking for PUD hugepages Suzuki K Poulose
2018-12-11 17:10 ` [PATCH v10 5/8] KVM: arm64: Support PUD hugepage in stage2_is_exec() Suzuki K Poulose
2018-12-11 17:10 ` [PATCH v10 6/8] KVM: arm64: Support handling access faults for PUD hugepages Suzuki K Poulose
2018-12-11 17:10 ` Suzuki K Poulose [this message]
2018-12-11 17:10 ` [PATCH v10 8/8] KVM: arm64: Add support for creating PUD hugepages at stage 2 Suzuki K Poulose
2018-12-18 11:37 ` [PATCH v10 0/8] kvm: arm64: Support PUD hugepage " Christoffer Dall
2019-01-04 7:09 ` Punit Agrawal
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