From: Ricardo Koller <ricarkol@google.com>
To: pbonzini@redhat.com, maz@kernel.org, oupton@google.com,
yuzenghui@huawei.com, dmatlack@google.com
Cc: kvm@vger.kernel.org, kvmarm@lists.linux.dev, qperret@google.com,
catalin.marinas@arm.com, andrew.jones@linux.dev,
seanjc@google.com, alexandru.elisei@arm.com,
suzuki.poulose@arm.com, eric.auger@redhat.com, gshan@redhat.com,
reijiw@google.com, rananta@google.com, bgardon@google.com,
ricarkol@gmail.com, Ricardo Koller <ricarkol@google.com>
Subject: [PATCH v4 11/12] KVM: arm64: Split huge pages during KVM_CLEAR_DIRTY_LOG
Date: Sat, 18 Feb 2023 03:23:13 +0000 [thread overview]
Message-ID: <20230218032314.635829-12-ricarkol@google.com> (raw)
In-Reply-To: <20230218032314.635829-1-ricarkol@google.com>
This is the arm64 counterpart of commit cb00a70bd4b7 ("KVM: x86/mmu:
Split huge pages mapped by the TDP MMU during KVM_CLEAR_DIRTY_LOG"),
which has the benefit of splitting the cost of splitting a memslot
across multiple ioctls.
Split huge pages on the range specified using KVM_CLEAR_DIRTY_LOG.
And do not split when enabling dirty logging if
KVM_DIRTY_LOG_INITIALLY_SET is set.
Signed-off-by: Ricardo Koller <ricarkol@google.com>
---
arch/arm64/kvm/mmu.c | 15 ++++++++++++---
1 file changed, 12 insertions(+), 3 deletions(-)
diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c
index 8e9d612dda00..5dae0e6a697f 100644
--- a/arch/arm64/kvm/mmu.c
+++ b/arch/arm64/kvm/mmu.c
@@ -1089,8 +1089,8 @@ static void kvm_mmu_split_memory_region(struct kvm *kvm, int slot)
* @mask: The mask of pages at offset 'gfn_offset' in this memory
* slot to enable dirty logging on
*
- * Writes protect selected pages to enable dirty logging for them. Caller must
- * acquire kvm->mmu_lock.
+ * Splits selected pages to PAGE_SIZE and then writes protect them to enable
+ * dirty logging for them. Caller must acquire kvm->mmu_lock.
*/
void kvm_arch_mmu_enable_log_dirty_pt_masked(struct kvm *kvm,
struct kvm_memory_slot *slot,
@@ -1103,6 +1103,13 @@ void kvm_arch_mmu_enable_log_dirty_pt_masked(struct kvm *kvm,
lockdep_assert_held_write(&kvm->mmu_lock);
stage2_wp_range(&kvm->arch.mmu, start, end);
+
+ /*
+ * If initially-all-set mode is not set, then huge-pages were already
+ * split when enabling dirty logging: no need to do it again.
+ */
+ if (kvm_dirty_log_manual_protect_and_init_set(kvm))
+ kvm_mmu_split_huge_pages(kvm, start, end);
}
static void kvm_send_hwpoison_signal(unsigned long address, short lsb)
@@ -1889,7 +1896,9 @@ void kvm_arch_commit_memory_region(struct kvm *kvm,
* this when deleting, moving, disabling dirty logging, or
* creating the memslot (a nop). Doing it for deletes makes
* sure we don't leak memory, and there's no need to keep the
- * cache around for any of the other cases.
+ * cache around for any of the other cases. Keeping the cache
+ * is useful for successive KVM_CLEAR_DIRTY_LOG calls, which is
+ * not handled in this function.
*/
kvm_mmu_free_memory_cache(&kvm->arch.mmu.split_page_cache);
}
--
2.39.2.637.g21b0678d19-goog
next prev parent reply other threads:[~2023-02-18 3:23 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-02-18 3:23 [PATCH v4 00/12] Implement Eager Page Splitting for ARM Ricardo Koller
2023-02-18 3:23 ` [PATCH v4 01/12] KVM: arm64: Add KVM_PGTABLE_WALK ctx->flags for skipping BBM and CMO Ricardo Koller
2023-02-18 3:23 ` [PATCH v4 02/12] KVM: arm64: Rename free_unlinked to free_removed Ricardo Koller
2023-02-18 3:23 ` [PATCH v4 03/12] KVM: arm64: Add helper for creating unlinked stage2 subtrees Ricardo Koller
2023-02-20 6:35 ` Shaoqin Huang
2023-03-01 20:10 ` Ricardo Koller
2023-02-20 6:45 ` Shaoqin Huang
2023-02-18 3:23 ` [PATCH v4 04/12] KVM: arm64: Add kvm_pgtable_stage2_split() Ricardo Koller
2023-02-18 3:28 ` Ricardo Koller
2023-02-20 7:08 ` Shaoqin Huang
2023-03-01 20:09 ` Ricardo Koller
2023-02-18 3:23 ` [PATCH v4 05/12] KVM: arm64: Refactor kvm_arch_commit_memory_region() Ricardo Koller
2023-02-18 3:23 ` [PATCH v4 06/12] KVM: arm64: Add kvm_uninit_stage2_mmu() Ricardo Koller
2023-02-18 3:23 ` [PATCH v4 07/12] KVM: arm64: Export kvm_are_all_memslots_empty() Ricardo Koller
2023-02-18 3:23 ` [PATCH v4 08/12] KVM: arm64: Add KVM_CAP_ARM_EAGER_SPLIT_CHUNK_SIZE Ricardo Koller
2023-02-18 3:23 ` [PATCH v4 09/12] KVM: arm64: Split huge pages when dirty logging is enabled Ricardo Koller
2023-02-18 3:23 ` [PATCH v4 10/12] KVM: arm64: Open-code kvm_mmu_write_protect_pt_masked() Ricardo Koller
2023-02-18 3:23 ` Ricardo Koller [this message]
2023-02-18 3:23 ` [PATCH v4 12/12] KVM: arm64: Use local TLBI on permission relaxation Ricardo Koller
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