From: Gavin Shan <gshan@redhat.com>
To: kvmarm@lists.cs.columbia.edu
Cc: kvm@vger.kernel.org, maz@kernel.org, bgardon@google.com,
andrew.jones@linux.dev, will@kernel.org, shan.gavin@gmail.com,
catalin.marinas@arm.com, dmatlack@google.com,
pbonzini@redhat.com, zhenyzha@redhat.com, shuah@kernel.org
Subject: [PATCH v3 3/6] KVM: arm64: Enable ring-based dirty memory tracking
Date: Thu, 22 Sep 2022 08:32:11 +0800 [thread overview]
Message-ID: <20220922003214.276736-4-gshan@redhat.com> (raw)
In-Reply-To: <20220922003214.276736-1-gshan@redhat.com>
This enables the ring-based dirty memory tracking on ARM64. The
feature is configured by CONFIG_HAVE_KVM_DIRTY_RING, detected and
enabled by KVM_CAP_DIRTY_LOG_RING. A ring buffer is created on every
VCPU when the feature is enabled. Each entry in the ring buffer is
described by 'struct kvm_dirty_gfn'.
A ring buffer entry is pushed when a page becomes dirty on host,
and pulled by userspace after the ring buffer is mapped at physical
page offset KVM_DIRTY_LOG_PAGE_OFFSET. The specific VCPU is enforced
to exit if its ring buffer becomes softly full. Besides, the ring
buffer can be reset by ioctl command KVM_RESET_DIRTY_RINGS to release
those pulled ring buffer entries.
Signed-off-by: Gavin Shan <gshan@redhat.com>
---
Documentation/virt/kvm/api.rst | 2 +-
arch/arm64/include/uapi/asm/kvm.h | 1 +
arch/arm64/kvm/Kconfig | 1 +
arch/arm64/kvm/arm.c | 8 ++++++++
4 files changed, 11 insertions(+), 1 deletion(-)
diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst
index abd7c32126ce..19fa1ac017ed 100644
--- a/Documentation/virt/kvm/api.rst
+++ b/Documentation/virt/kvm/api.rst
@@ -8022,7 +8022,7 @@ regardless of what has actually been exposed through the CPUID leaf.
8.29 KVM_CAP_DIRTY_LOG_RING
---------------------------
-:Architectures: x86
+:Architectures: x86, arm64
:Parameters: args[0] - size of the dirty log ring
KVM is capable of tracking dirty memory using ring buffers that are
diff --git a/arch/arm64/include/uapi/asm/kvm.h b/arch/arm64/include/uapi/asm/kvm.h
index 316917b98707..a7a857f1784d 100644
--- a/arch/arm64/include/uapi/asm/kvm.h
+++ b/arch/arm64/include/uapi/asm/kvm.h
@@ -43,6 +43,7 @@
#define __KVM_HAVE_VCPU_EVENTS
#define KVM_COALESCED_MMIO_PAGE_OFFSET 1
+#define KVM_DIRTY_LOG_PAGE_OFFSET 64
#define KVM_REG_SIZE(id) \
(1U << (((id) & KVM_REG_SIZE_MASK) >> KVM_REG_SIZE_SHIFT))
diff --git a/arch/arm64/kvm/Kconfig b/arch/arm64/kvm/Kconfig
index 815cc118c675..0309b2d0f2da 100644
--- a/arch/arm64/kvm/Kconfig
+++ b/arch/arm64/kvm/Kconfig
@@ -32,6 +32,7 @@ menuconfig KVM
select KVM_VFIO
select HAVE_KVM_EVENTFD
select HAVE_KVM_IRQFD
+ select HAVE_KVM_DIRTY_RING
select HAVE_KVM_MSI
select HAVE_KVM_IRQCHIP
select HAVE_KVM_IRQ_ROUTING
diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index 2ff0ef62abad..76816f8e082b 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c
@@ -747,6 +747,14 @@ static int check_vcpu_requests(struct kvm_vcpu *vcpu)
if (kvm_check_request(KVM_REQ_SUSPEND, vcpu))
return kvm_vcpu_suspend(vcpu);
+
+ if (kvm_check_request(KVM_REQ_RING_SOFT_FULL, vcpu) &&
+ kvm_dirty_ring_soft_full(&vcpu->dirty_ring)) {
+ kvm_make_request(KVM_REQ_RING_SOFT_FULL, vcpu);
+ vcpu->run->exit_reason = KVM_EXIT_DIRTY_RING_FULL;
+ trace_kvm_dirty_ring_exit(vcpu);
+ return 0;
+ }
}
return 1;
--
2.23.0
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next prev parent reply other threads:[~2022-09-22 0:32 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-22 0:32 [PATCH v3 0/6] KVM: arm64: Enable ring-based dirty memory tracking Gavin Shan
2022-09-22 0:32 ` [PATCH v3 1/6] KVM: x86: Introduce KVM_REQ_RING_SOFT_FULL Gavin Shan
2022-09-22 0:32 ` [PATCH v3 2/6] KVM: x86: Move declaration of kvm_cpu_dirty_log_size() to kvm_dirty_ring.h Gavin Shan
2022-09-24 19:12 ` Marc Zyngier
2022-09-25 23:09 ` Gavin Shan
2022-09-22 0:32 ` Gavin Shan [this message]
2022-09-24 20:27 ` [PATCH v3 3/6] KVM: arm64: Enable ring-based dirty memory tracking Marc Zyngier
2022-09-25 23:13 ` Gavin Shan
2022-09-22 0:32 ` [PATCH v3 4/6] KVM: selftests: Use host page size to map ring buffer in dirty_log_test Gavin Shan
2022-09-22 0:32 ` [PATCH v3 5/6] KVM: selftests: Clear dirty ring states between two modes " Gavin Shan
2022-09-22 0:32 ` [PATCH v3 6/6] KVM: selftests: Automate choosing dirty ring size " Gavin Shan
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