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From: Punit Agrawal <punit.agrawal@arm.com>
To: kvmarm@lists.cs.columbia.edu
Cc: Punit Agrawal <punit.agrawal@arm.com>,
	marc.zyngier@arm.com, will.deacon@arm.com,
	linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org, suzuki.poulose@arm.com,
	punitagrawal@gmail.com,
	Christoffer Dall <christoffer.dall@arm.com>,
	Russell King <linux@armlinux.org.uk>,
	Catalin Marinas <catalin.marinas@arm.com>
Subject: [PATCH v9 7/8] KVM: arm64: Update age handlers to support PUD hugepages
Date: Wed, 31 Oct 2018 17:57:44 +0000	[thread overview]
Message-ID: <20181031175745.18650-8-punit.agrawal@arm.com> (raw)
In-Reply-To: <20181031175745.18650-1-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>
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


  parent reply	other threads:[~2018-10-31 17:58 UTC|newest]

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-10-31 17:57 [PATCH v9 0/8] KVM: Support PUD hugepage at stage 2 Punit Agrawal
2018-10-31 17:57 ` [PATCH v9 1/8] KVM: arm/arm64: Share common code in user_mem_abort() Punit Agrawal
2018-12-03 12:11   ` Anshuman Khandual
2018-12-03 13:37     ` Suzuki K Poulose
2018-12-10  8:56       ` Christoffer Dall
2018-12-10 10:26         ` Suzuki K Poulose
2018-12-10 10:47         ` Suzuki K Poulose
2018-12-10 11:01           ` Christoffer Dall
2018-10-31 17:57 ` [PATCH v9 2/8] KVM: arm/arm64: Re-factor setting the Stage 2 entry to exec on fault Punit Agrawal
2018-12-03 13:32   ` Anshuman Khandual
2018-12-05 10:47     ` Suzuki K Poulose
2018-12-10  9:00       ` Christoffer Dall
2018-12-10  8:59     ` Christoffer Dall
2018-10-31 17:57 ` [PATCH v9 3/8] KVM: arm/arm64: Introduce helpers to manipulate page table entries Punit Agrawal
2018-12-03 13:50   ` Anshuman Khandual
2018-12-03 14:03     ` Suzuki K Poulose
2018-12-10  9:01     ` Christoffer Dall
2018-10-31 17:57 ` [PATCH v9 4/8] KVM: arm64: Support dirty page tracking for PUD hugepages Punit Agrawal
2018-12-03 14:17   ` Anshuman Khandual
2018-12-03 14:21     ` Suzuki K Poulose
2018-10-31 17:57 ` [PATCH v9 5/8] KVM: arm64: Support PUD hugepage in stage2_is_exec() Punit Agrawal
2018-11-01 13:38   ` Christoffer Dall
2018-12-05 17:57     ` Suzuki K Poulose
2018-12-10  9:06       ` Christoffer Dall
2018-12-03 14:37   ` Anshuman Khandual
2018-10-31 17:57 ` [PATCH v9 6/8] KVM: arm64: Support handling access faults for PUD hugepages Punit Agrawal
2018-11-01 13:40   ` Christoffer Dall
2018-12-03 15:10   ` Anshuman Khandual
2018-10-31 17:57 ` Punit Agrawal [this message]
2018-12-03 15:19   ` [PATCH v9 7/8] KVM: arm64: Update age handlers to support " Anshuman Khandual
2018-10-31 17:57 ` [PATCH v9 8/8] KVM: arm64: Add support for creating PUD hugepages at stage 2 Punit Agrawal
2018-12-03 15:46   ` Anshuman Khandual

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