linux-kernel - [PATCH v11 17/35] KVM: Add HVA range operator

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Message-ID: <20231230172351.574091-18-michael.roth@amd.com>
Date: Sat, 30 Dec 2023 11:23:33 -0600
From: Michael Roth <michael.roth@....com>
To: <kvm@...r.kernel.org>
CC: <linux-coco@...ts.linux.dev>, <linux-mm@...ck.org>,
	<linux-crypto@...r.kernel.org>, <x86@...nel.org>,
	<linux-kernel@...r.kernel.org>, <tglx@...utronix.de>, <mingo@...hat.com>,
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	<pankaj.gupta@....com>, <liam.merwick@...cle.com>, <zhi.a.wang@...el.com>,
	Vishal Annapurve <vannapurve@...gle.com>
Subject: [PATCH v11 17/35] KVM: Add HVA range operator

From: Vishal Annapurve <vannapurve@...gle.com>

Introduce HVA range operator so that other KVM subsystems can operate on
HVA ranges.

Signed-off-by: Vishal Annapurve <vannapurve@...gle.com>
[mdr: minor checkpatch alignment fixups]
Signed-off-by: Michael Roth <michael.roth@....com>
---
 include/linux/kvm_host.h |  6 +++++
 virt/kvm/kvm_main.c      | 49 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 55 insertions(+)

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index a2a8331fbb94..bc3a468e97e3 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -1429,6 +1429,12 @@ void kvm_mmu_invalidate_range_add(struct kvm *kvm, gfn_t start, gfn_t end);
 void kvm_mmu_invalidate_end(struct kvm *kvm);
 bool kvm_mmu_unmap_gfn_range(struct kvm *kvm, struct kvm_gfn_range *range);
 
+typedef int (*kvm_hva_range_op_t)(struct kvm *kvm,
+				struct kvm_gfn_range *range, void *data);
+
+int kvm_vm_do_hva_range_op(struct kvm *kvm, unsigned long hva_start,
+			   unsigned long hva_end, kvm_hva_range_op_t handler, void *data);
+
 long kvm_arch_dev_ioctl(struct file *filp,
 			unsigned int ioctl, unsigned long arg);
 long kvm_arch_vcpu_ioctl(struct file *filp,
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 4fd0fb0044f5..03243a7ece08 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -667,6 +667,55 @@ static __always_inline kvm_mn_ret_t __kvm_handle_hva_range(struct kvm *kvm,
 	return r;
 }
 
+int kvm_vm_do_hva_range_op(struct kvm *kvm, unsigned long hva_start,
+			   unsigned long hva_end, kvm_hva_range_op_t handler, void *data)
+{
+	int ret = 0;
+	struct kvm_gfn_range gfn_range;
+	struct kvm_memory_slot *slot;
+	struct kvm_memslots *slots;
+	int i, idx;
+
+	if (WARN_ON_ONCE(hva_end <= hva_start))
+		return -EINVAL;
+
+	idx = srcu_read_lock(&kvm->srcu);
+
+	for (i = 0; i < kvm_arch_nr_memslot_as_ids(kvm); i++) {
+		struct interval_tree_node *node;
+
+		slots = __kvm_memslots(kvm, i);
+		kvm_for_each_memslot_in_hva_range(node, slots,
+						  hva_start, hva_end - 1) {
+			unsigned long start, end;
+
+			slot = container_of(node, struct kvm_memory_slot,
+					    hva_node[slots->node_idx]);
+			start = max(hva_start, slot->userspace_addr);
+			end = min(hva_end, slot->userspace_addr +
+						  (slot->npages << PAGE_SHIFT));
+
+			/*
+			 * {gfn(page) | page intersects with [hva_start, hva_end)} =
+			 * {gfn_start, gfn_start+1, ..., gfn_end-1}.
+			 */
+			gfn_range.start = hva_to_gfn_memslot(start, slot);
+			gfn_range.end = hva_to_gfn_memslot(end + PAGE_SIZE - 1, slot);
+			gfn_range.slot = slot;
+
+			ret = handler(kvm, &gfn_range, data);
+			if (ret)
+				goto e_ret;
+		}
+	}
+
+e_ret:
+	srcu_read_unlock(&kvm->srcu, idx);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(kvm_vm_do_hva_range_op);
+
 static __always_inline int kvm_handle_hva_range(struct mmu_notifier *mn,
 						unsigned long start,
 						unsigned long end,
-- 
2.25.1