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,
Christoffer Dall <christoffer.dall@arm.com>,
Russell King <linux@armlinux.org.uk>,
Catalin Marinas <catalin.marinas@arm.com>
Subject: [PATCH v7 7/9] KVM: arm64: Support handling access faults for PUD hugepages
Date: Mon, 24 Sep 2018 18:45:50 +0100 [thread overview]
Message-ID: <20180924174552.8387-8-punit.agrawal@arm.com> (raw)
In-Reply-To: <20180924174552.8387-1-punit.agrawal@arm.com>
In preparation for creating larger hugepages at Stage 2, extend the
access fault handling at Stage 2 to support PUD hugepages when
encountered.
Provide trivial helpers for arm32 to allow sharing of 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 | 9 +++++++++
arch/arm64/include/asm/kvm_mmu.h | 7 +++++++
arch/arm64/include/asm/pgtable.h | 6 ++++++
virt/kvm/arm/mmu.c | 22 +++++++++++-----------
4 files changed, 33 insertions(+), 11 deletions(-)
diff --git a/arch/arm/include/asm/kvm_mmu.h b/arch/arm/include/asm/kvm_mmu.h
index 26a2ab05b3f6..95b34aad0dc8 100644
--- a/arch/arm/include/asm/kvm_mmu.h
+++ b/arch/arm/include/asm/kvm_mmu.h
@@ -85,6 +85,9 @@ void kvm_clear_hyp_idmap(void);
#define kvm_pfn_pte(pfn, prot) pfn_pte(pfn, prot)
#define kvm_pfn_pmd(pfn, prot) pfn_pmd(pfn, prot)
+#define kvm_pud_pfn(pud) ({ BUG(); 0; })
+
+
#define kvm_pmd_mkhuge(pmd) pmd_mkhuge(pmd)
/*
@@ -108,6 +111,12 @@ static inline bool kvm_s2pud_exec(pud_t *pud)
return false;
}
+static inline pud_t kvm_s2pud_mkyoung(pud_t pud)
+{
+ BUG();
+ return pud;
+}
+
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 c06ef3be8ca9..b93e5167728f 100644
--- a/arch/arm64/include/asm/kvm_mmu.h
+++ b/arch/arm64/include/asm/kvm_mmu.h
@@ -187,6 +187,8 @@ void kvm_clear_hyp_idmap(void);
#define kvm_pfn_pte(pfn, prot) pfn_pte(pfn, prot)
#define kvm_pfn_pmd(pfn, prot) pfn_pmd(pfn, prot)
+#define kvm_pud_pfn(pud) pud_pfn(pud)
+
#define kvm_pmd_mkhuge(pmd) pmd_mkhuge(pmd)
static inline pte_t kvm_s2pte_mkwrite(pte_t pte)
@@ -266,6 +268,11 @@ static inline bool kvm_s2pud_exec(pud_t *pudp)
return !(READ_ONCE(pud_val(*pudp)) & PUD_S2_XN);
}
+static inline pud_t kvm_s2pud_mkyoung(pud_t pud)
+{
+ return pud_mkyoung(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 1bdeca8918a6..a64a5c35beb1 100644
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h
@@ -314,6 +314,11 @@ static inline pte_t pud_pte(pud_t pud)
return __pte(pud_val(pud));
}
+static inline pud_t pte_pud(pte_t pte)
+{
+ return __pud(pte_val(pte));
+}
+
static inline pmd_t pud_pmd(pud_t pud)
{
return __pmd(pud_val(pud));
@@ -380,6 +385,7 @@ 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_mkyoung(pud) pte_pud(pte_mkyoung(pud_pte(pud)))
#define pud_write(pud) pte_write(pud_pte(pud))
#define __pud_to_phys(pud) __pte_to_phys(pud_pte(pud))
diff --git a/virt/kvm/arm/mmu.c b/virt/kvm/arm/mmu.c
index 5fd1eae7d964..e2487e5fff37 100644
--- a/virt/kvm/arm/mmu.c
+++ b/virt/kvm/arm/mmu.c
@@ -1706,6 +1706,7 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
*/
static void handle_access_fault(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa)
{
+ pud_t *pud;
pmd_t *pmd;
pte_t *pte;
kvm_pfn_t pfn;
@@ -1715,24 +1716,23 @@ static void handle_access_fault(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa)
spin_lock(&vcpu->kvm->mmu_lock);
- pmd = stage2_get_pmd(vcpu->kvm, NULL, fault_ipa);
- if (!pmd || pmd_none(*pmd)) /* Nothing there */
+ if (!stage2_get_leaf_entry(vcpu->kvm, fault_ipa, &pud, &pmd, &pte))
goto out;
- if (pmd_thp_or_huge(*pmd)) { /* THP, HugeTLB */
+ if (pud) { /* HugeTLB */
+ *pud = kvm_s2pud_mkyoung(*pud);
+ pfn = kvm_pud_pfn(*pud);
+ pfn_valid = true;
+ } else if (pmd) { /* THP, HugeTLB */
*pmd = pmd_mkyoung(*pmd);
pfn = pmd_pfn(*pmd);
pfn_valid = true;
- goto out;
+ } else {
+ *pte = pte_mkyoung(*pte); /* Just a page... */
+ pfn = pte_pfn(*pte);
+ pfn_valid = true;
}
- pte = pte_offset_kernel(pmd, fault_ipa);
- if (pte_none(*pte)) /* Nothing there either */
- goto out;
-
- *pte = pte_mkyoung(*pte); /* Just a page... */
- pfn = pte_pfn(*pte);
- pfn_valid = true;
out:
spin_unlock(&vcpu->kvm->mmu_lock);
if (pfn_valid)
--
2.18.0
next prev parent reply other threads:[~2018-09-24 17:46 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-24 17:45 [PATCH v7 0/9] KVM: Support PUD hugepages at stage 2 Punit Agrawal
2018-09-24 17:45 ` [PATCH v7 1/9] KVM: arm/arm64: Ensure only THP is candidate for adjustment Punit Agrawal
2018-09-24 20:54 ` Suzuki K Poulose
2018-09-24 17:45 ` [PATCH v7 2/9] KVM: arm/arm64: Share common code in user_mem_abort() Punit Agrawal
2018-09-24 17:45 ` [PATCH v7 3/9] KVM: arm/arm64: Re-factor setting the Stage 2 entry to exec on fault Punit Agrawal
2018-09-24 17:45 ` [PATCH v7 4/9] KVM: arm/arm64: Introduce helpers to manipulate page table entries Punit Agrawal
2018-09-24 17:45 ` [PATCH v7 5/9] KVM: arm64: Support dirty page tracking for PUD hugepages Punit Agrawal
2018-09-24 17:45 ` [PATCH v7 6/9] KVM: arm64: Support PUD hugepage in stage2_is_exec() Punit Agrawal
2018-09-24 17:45 ` Punit Agrawal [this message]
2018-09-24 17:45 ` [PATCH v7 8/9] KVM: arm64: Update age handlers to support PUD hugepages Punit Agrawal
2018-09-24 17:45 ` [PATCH v7 9/9] KVM: arm64: Add support for creating PUD hugepages at stage 2 Punit Agrawal
2018-09-24 21:21 ` Suzuki K Poulose
2018-09-25 9:21 ` Punit Agrawal
2018-09-25 14:37 ` [PATCH v7.1 " Punit Agrawal
2018-10-01 14:00 ` Punit Agrawal
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