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From: Will Deacon <will@kernel.org>
To: kvmarm@lists.cs.columbia.edu
Cc: kernel-team@android.com, Marc Zyngier <maz@kernel.org>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,
	linux-arm-kernel@lists.infradead.org
Subject: [PATCH v3 12/21] KVM: arm64: Add support for stage-2 write-protect in generic page-table
Date: Tue, 25 Aug 2020 10:39:44 +0100	[thread overview]
Message-ID: <20200825093953.26493-13-will@kernel.org> (raw)
In-Reply-To: <20200825093953.26493-1-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;
-- 
2.28.0.297.g1956fa8f8d-goog

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  parent reply	other threads:[~2020-08-25  9:40 UTC|newest]

Thread overview: 86+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-25  9:39 [PATCH v3 00/21] KVM: arm64: Rewrite page-table code and fault handling Will Deacon
2020-08-25  9:39 ` [PATCH v3 01/21] KVM: arm64: Remove kvm_mmu_free_memory_caches() Will Deacon
2020-08-25  9:39 ` [PATCH v3 02/21] KVM: arm64: Add stand-alone page-table walker infrastructure Will Deacon
2020-08-27 16:27   ` Alexandru Elisei
2020-08-28 15:43     ` Alexandru Elisei
2020-09-02 10:36     ` Will Deacon
2020-08-28 15:51   ` Alexandru Elisei
2020-09-02 10:49     ` Will Deacon
2020-09-02  6:31   ` Gavin Shan
2020-09-02 11:02     ` Will Deacon
2020-09-03  1:11       ` Gavin Shan
2020-08-25  9:39 ` [PATCH v3 03/21] KVM: arm64: Add support for creating kernel-agnostic stage-1 page tables Will Deacon
2020-08-28 15:35   ` Alexandru Elisei
2020-09-02 10:06     ` Will Deacon
2020-08-25  9:39 ` [PATCH v3 04/21] KVM: arm64: Use generic allocator for hyp stage-1 page-tables Will Deacon
2020-08-28 16:32   ` Alexandru Elisei
2020-09-02 11:35     ` Will Deacon
2020-09-02 14:48       ` Alexandru Elisei
2020-08-25  9:39 ` [PATCH v3 05/21] KVM: arm64: Add support for creating kernel-agnostic stage-2 page tables Will Deacon
2020-09-02  6:40   ` Gavin Shan
2020-09-02 11:30     ` Will Deacon
2020-08-25  9:39 ` [PATCH v3 06/21] KVM: arm64: Add support for stage-2 map()/unmap() in generic page-table Will Deacon
2020-09-01 16:24   ` Alexandru Elisei
2020-09-02 11:46     ` Will Deacon
2020-09-03  2:57   ` Gavin Shan
2020-09-03  5:27     ` Gavin Shan
2020-09-03 11:18   ` Gavin Shan
2020-09-03 12:30     ` Will Deacon
2020-09-03 16:15       ` Will Deacon
2020-09-04  0:47         ` Gavin Shan
2020-08-25  9:39 ` [PATCH v3 07/21] KVM: arm64: Convert kvm_phys_addr_ioremap() to generic page-table API Will Deacon
2020-09-01 17:08   ` Alexandru Elisei
2020-09-02 11:48     ` Will Deacon
2020-09-03  3:57   ` Gavin Shan
2020-08-25  9:39 ` [PATCH v3 08/21] KVM: arm64: Convert kvm_set_spte_hva() " Will Deacon
2020-09-02 15:37   ` Alexandru Elisei
2020-09-03 16:37     ` Will Deacon
2020-09-03  4:13   ` Gavin Shan
2020-08-25  9:39 ` [PATCH v3 09/21] KVM: arm64: Convert unmap_stage2_range() " Will Deacon
2020-09-02 16:23   ` Alexandru Elisei
2020-09-02 18:44     ` Alexandru Elisei
2020-09-03 17:57     ` Will Deacon
2020-09-08 13:07       ` Alexandru Elisei
2020-09-09 10:57         ` Alexandru Elisei
2020-09-03  4:19   ` Gavin Shan
2020-08-25  9:39 ` [PATCH v3 10/21] KVM: arm64: Add support for stage-2 page-aging in generic page-table Will Deacon
2020-09-03  4:33   ` Gavin Shan
2020-09-03 16:48     ` Will Deacon
2020-09-04  1:01       ` Gavin Shan
2020-08-25  9:39 ` [PATCH v3 11/21] KVM: arm64: Convert page-aging and access faults to generic page-table API Will Deacon
2020-09-03  4:37   ` Gavin Shan
2020-08-25  9:39 ` Will Deacon [this message]
2020-09-03  4:47   ` [PATCH v3 12/21] KVM: arm64: Add support for stage-2 write-protect in generic page-table Gavin Shan
2020-08-25  9:39 ` [PATCH v3 13/21] KVM: arm64: Convert write-protect operation to generic page-table API Will Deacon
2020-09-03  4:48   ` Gavin Shan
2020-08-25  9:39 ` [PATCH v3 14/21] KVM: arm64: Add support for stage-2 cache flushing in generic page-table Will Deacon
2020-09-03  4:51   ` Gavin Shan
2020-08-25  9:39 ` [PATCH v3 15/21] KVM: arm64: Convert memslot cache-flushing code to generic page-table API Will Deacon
2020-09-03  4:52   ` Gavin Shan
2020-08-25  9:39 ` [PATCH v3 16/21] KVM: arm64: Add support for relaxing stage-2 perms in generic page-table code Will Deacon
2020-09-03  4:55   ` Gavin Shan
2020-08-25  9:39 ` [PATCH v3 17/21] KVM: arm64: Convert user_mem_abort() to generic page-table API Will Deacon
2020-09-03  6:05   ` Gavin Shan
2020-08-25  9:39 ` [PATCH v3 18/21] KVM: arm64: Check the pgt instead of the pgd when modifying page-table Will Deacon
2020-09-03  5:00   ` Gavin Shan
2020-08-25  9:39 ` [PATCH v3 19/21] KVM: arm64: Remove unused page-table code Will Deacon
2020-09-03  6:02   ` Gavin Shan
2020-08-25  9:39 ` [PATCH v3 20/21] KVM: arm64: Remove unused 'pgd' field from 'struct kvm_s2_mmu' Will Deacon
2020-09-03  5:07   ` Gavin Shan
2020-09-03 16:50     ` Will Deacon
2020-09-04  0:59       ` Gavin Shan
2020-09-04 10:02         ` Marc Zyngier
2020-08-25  9:39 ` [PATCH v3 21/21] KVM: arm64: Don't constrain maximum IPA size based on host configuration Will Deacon
2020-09-03  5:09   ` Gavin Shan
2020-08-27 16:26 ` [PATCH v3 00/21] KVM: arm64: Rewrite page-table code and fault handling Alexandru Elisei
2020-09-01 16:15   ` Will Deacon
2020-09-03  7:34 ` Gavin Shan
2020-09-03 11:13   ` Gavin Shan
2020-09-03 11:48     ` Gavin Shan
2020-09-03 12:16       ` Will Deacon
2020-09-04  0:51         ` Gavin Shan
2020-09-04 10:07           ` Marc Zyngier
2020-09-05  3:56             ` Gavin Shan
2020-09-05  9:33               ` Marc Zyngier
2020-09-07  9:27           ` Will Deacon
2020-09-03 18:52 ` Will Deacon

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