From: Will Deacon <will@kernel•org>
To: kvmarm@lists•cs.columbia.edu
Cc: kernel-team@android•com, Suzuki Poulose <suzuki.poulose@arm•com>,
Marc Zyngier <maz@kernel•org>,
Quentin Perret <qperret@google•com>,
James Morse <james.morse@arm•com>,
Catalin Marinas <catalin.marinas@arm•com>,
Will Deacon <will@kernel•org>,
linux-arm-kernel@lists•infradead.org
Subject: [PATCH v2 13/22] KVM: arm64: Add support for stage-2 write-protect in generic page-table
Date: Tue, 18 Aug 2020 14:28:09 +0100 [thread overview]
Message-ID: <20200818132818.16065-14-will@kernel.org> (raw)
In-Reply-To: <20200818132818.16065-1-will@kernel.org>
From: Quentin Perret <qperret@google•com>
Add a stage-2 wrprotect() operation to the generic page-table code.
Cc: Marc Zyngier <maz@kernel•org>
Signed-off-by: Quentin Perret <qperret@google•com>
Signed-off-by: Will Deacon <will@kernel•org>
---
arch/arm64/include/asm/kvm_pgtable.h | 15 +++++++++++++++
arch/arm64/kvm/hyp/pgtable.c | 6 ++++++
2 files changed, 21 insertions(+)
diff --git a/arch/arm64/include/asm/kvm_pgtable.h b/arch/arm64/include/asm/kvm_pgtable.h
index ae56534f87a0..0c96b78d791d 100644
--- a/arch/arm64/include/asm/kvm_pgtable.h
+++ b/arch/arm64/include/asm/kvm_pgtable.h
@@ -173,6 +173,21 @@ int kvm_pgtable_stage2_map(struct kvm_pgtable *pgt, u64 addr, u64 size,
*/
int kvm_pgtable_stage2_unmap(struct kvm_pgtable *pgt, u64 addr, u64 size);
+/**
+ * kvm_pgtable_stage2_wrprotect() - Write-protect guest stage-2 address range
+ * without TLB invalidation.
+ * @pgt: Page-table structure initialised by kvm_pgtable_stage2_init().
+ * @addr: Intermediate physical address from which to write-protect,
+ * @size: Size of the range.
+ *
+ * Note that it is the caller's responsibility to invalidate the TLB after
+ * calling this function to ensure that the updated permissions are visible
+ * to the CPUs.
+ *
+ * Return: 0 on success, negative error code on failure.
+ */
+int kvm_pgtable_stage2_wrprotect(struct kvm_pgtable *pgt, u64 addr, u64 size);
+
/**
* kvm_pgtable_stage2_mkyoung() - Set the access flag in a page-table entry.
* @pgt: Page-table structure initialised by kvm_pgtable_stage2_init().
diff --git a/arch/arm64/kvm/hyp/pgtable.c b/arch/arm64/kvm/hyp/pgtable.c
index 30713eb773e0..c218651f8eba 100644
--- a/arch/arm64/kvm/hyp/pgtable.c
+++ b/arch/arm64/kvm/hyp/pgtable.c
@@ -726,6 +726,12 @@ static int stage2_update_leaf_attrs(struct kvm_pgtable *pgt, u64 addr,
return 0;
}
+int kvm_pgtable_stage2_wrprotect(struct kvm_pgtable *pgt, u64 addr, u64 size)
+{
+ return stage2_update_leaf_attrs(pgt, addr, size, 0,
+ KVM_PTE_LEAF_ATTR_LO_S2_S2AP_W, NULL);
+}
+
kvm_pte_t kvm_pgtable_stage2_mkyoung(struct kvm_pgtable *pgt, u64 addr)
{
kvm_pte_t pte = 0;
--
2.28.0.220.ged08abb693-goog
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next prev parent reply other threads:[~2020-08-18 13:34 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-18 13:27 [PATCH v2 00/22] KVM: arm64: Rewrite page-table code and fault handling Will Deacon
2020-08-18 13:27 ` [PATCH v2 01/22] KVM: arm64: Don't free memcache pages in kvm_phys_addr_ioremap() Will Deacon
2020-08-19 4:38 ` Gavin Shan
2020-08-19 9:03 ` Will Deacon
2020-08-18 13:27 ` [PATCH v2 02/22] KVM: arm64: Remove kvm_mmu_free_memory_caches() Will Deacon
2020-08-19 4:45 ` Gavin Shan
2020-08-18 13:27 ` [PATCH v2 03/22] KVM: arm64: Add stand-alone page-table walker infrastructure Will Deacon
2020-08-18 13:28 ` [PATCH v2 04/22] KVM: arm64: Add support for creating kernel-agnostic stage-1 page tables Will Deacon
2020-08-18 13:28 ` [PATCH v2 05/22] KVM: arm64: Use generic allocator for hyp stage-1 page-tables Will Deacon
2020-08-18 13:28 ` [PATCH v2 06/22] KVM: arm64: Add support for creating kernel-agnostic stage-2 page tables Will Deacon
2020-08-18 13:28 ` [PATCH v2 07/22] KVM: arm64: Add support for stage-2 map()/unmap() in generic page-table Will Deacon
2020-08-18 13:28 ` [PATCH v2 08/22] KVM: arm64: Convert kvm_phys_addr_ioremap() to generic page-table API Will Deacon
2020-08-18 13:28 ` [PATCH v2 09/22] KVM: arm64: Convert kvm_set_spte_hva() " Will Deacon
2020-08-18 13:28 ` [PATCH v2 10/22] KVM: arm64: Convert unmap_stage2_range() " Will Deacon
2020-08-18 13:28 ` [PATCH v2 11/22] KVM: arm64: Add support for stage-2 page-aging in generic page-table Will Deacon
2020-08-18 13:28 ` [PATCH v2 12/22] KVM: arm64: Convert page-aging and access faults to generic page-table API Will Deacon
2020-08-18 13:28 ` Will Deacon [this message]
2020-08-18 13:28 ` [PATCH v2 14/22] KVM: arm64: Convert write-protect operation " Will Deacon
2020-08-18 13:28 ` [PATCH v2 15/22] KVM: arm64: Add support for stage-2 cache flushing in generic page-table Will Deacon
2020-08-18 13:28 ` [PATCH v2 16/22] KVM: arm64: Convert memslot cache-flushing code to generic page-table API Will Deacon
2020-08-18 13:28 ` [PATCH v2 17/22] KVM: arm64: Add support for relaxing stage-2 perms in generic page-table code Will Deacon
2020-08-18 13:28 ` [PATCH v2 18/22] KVM: arm64: Convert user_mem_abort() to generic page-table API Will Deacon
2020-08-18 13:28 ` [PATCH v2 19/22] KVM: arm64: Check the pgt instead of the pgd when modifying page-table Will Deacon
2020-08-18 13:28 ` [PATCH v2 20/22] KVM: arm64: Remove unused page-table code Will Deacon
2020-08-18 13:28 ` [PATCH v2 21/22] KVM: arm64: Remove unused 'pgd' field from 'struct kvm_s2_mmu' Will Deacon
2020-08-18 13:28 ` [PATCH v2 22/22] KVM: arm64: Don't constrain maximum IPA size based on host configuration Will Deacon
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