From: Shivam Kumar <shivam.kumar1@nutanix.com>
To: pbonzini@redhat.com
Cc: kvm@vger.kernel.org, Shivam Kumar <shivam.kumar1@nutanix.com>,
Anurag Madnawat <anurag.madnawat@nutanix.com>,
Shaju Abraham <shaju.abraham@nutanix.com>,
Manish Mishra <manish.mishra@nutanix.com>
Subject: [PATCH 5/6] Exit to userspace when dirty quota is full.
Date: Tue, 26 Oct 2021 16:35:10 +0000 [thread overview]
Message-ID: <20211026163511.90558-6-shivam.kumar1@nutanix.com> (raw)
In-Reply-To: <20211026163511.90558-1-shivam.kumar1@nutanix.com>
Whenever dirty quota is full (i.e. dirty counter equals dirty quota),
control is passed to the QEMU side, through a KVM exit with the custom exit
reason KVM_EXIT_DIRTY_QUOTA_FULL, to handle the dirty quota full event.
Co-developed-by: Anurag Madnawat <anurag.madnawat@nutanix.com>
Signed-off-by: Anurag Madnawat <anurag.madnawat@nutanix.com>
Signed-off-by: Shivam Kumar <shivam.kumar1@nutanix.com>
Signed-off-by: Shaju Abraham <shaju.abraham@nutanix.com>
Signed-off-by: Manish Mishra <manish.mishra@nutanix.com>
---
arch/x86/kvm/x86.c | 9 +++++++++
include/linux/dirty_quota_migration.h | 1 +
include/uapi/linux/kvm.h | 1 +
virt/kvm/dirty_quota_migration.c | 5 +++++
4 files changed, 16 insertions(+)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index b26647a5ea22..ee9464d71f01 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -59,6 +59,7 @@
#include <linux/mem_encrypt.h>
#include <linux/entry-kvm.h>
#include <linux/suspend.h>
+#include <linux/dirty_quota_migration.h>
#include <trace/events/kvm.h>
@@ -9843,6 +9844,14 @@ static int vcpu_run(struct kvm_vcpu *vcpu)
return r;
vcpu->srcu_idx = srcu_read_lock(&kvm->srcu);
}
+
+ /* check for dirty quota migration exit condition if it is enabled */
+ if (vcpu->kvm->dirty_quota_migration_enabled &&
+ is_dirty_quota_full(vcpu->vCPUdqctx)) {
+ vcpu->run->exit_reason = KVM_EXIT_DIRTY_QUOTA_FULL;
+ r = 0;
+ break;
+ }
}
srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx);
diff --git a/include/linux/dirty_quota_migration.h b/include/linux/dirty_quota_migration.h
index a9a54c38ee54..f343c073f38d 100644
--- a/include/linux/dirty_quota_migration.h
+++ b/include/linux/dirty_quota_migration.h
@@ -15,5 +15,6 @@ struct vCPUDirtyQuotaContext {
int kvm_vcpu_dirty_quota_alloc(struct vCPUDirtyQuotaContext **vCPUdqctx);
struct page *kvm_dirty_quota_context_get_page(
struct vCPUDirtyQuotaContext *vCPUdqctx, u32 offset);
+bool is_dirty_quota_full(struct vCPUDirtyQuotaContext *vCPUdqctx);
#endif /* DIRTY_QUOTA_MIGRATION_H */
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index 3649a3bb9bb8..0f04cd99fc8d 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -269,6 +269,7 @@ struct kvm_xen_exit {
#define KVM_EXIT_AP_RESET_HOLD 32
#define KVM_EXIT_X86_BUS_LOCK 33
#define KVM_EXIT_XEN 34
+#define KVM_EXIT_DIRTY_QUOTA_FULL 35
/* For KVM_EXIT_INTERNAL_ERROR */
/* Emulate instruction failed. */
diff --git a/virt/kvm/dirty_quota_migration.c b/virt/kvm/dirty_quota_migration.c
index 7e9ace760939..eeef19347af4 100644
--- a/virt/kvm/dirty_quota_migration.c
+++ b/virt/kvm/dirty_quota_migration.c
@@ -18,3 +18,8 @@ struct page *kvm_dirty_quota_context_get_page(
{
return vmalloc_to_page((void *)vCPUdqctx + offset * PAGE_SIZE);
}
+
+bool is_dirty_quota_full(struct vCPUDirtyQuotaContext *vCPUdqctx)
+{
+ return (vCPUdqctx->dirty_counter >= vCPUdqctx->dirty_quota);
+}
--
2.22.3
next prev parent reply other threads:[~2021-10-26 16:36 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-26 16:35 [PATCH 0/6] KVM: Dirty Quota-Based VM Live Migration Auto-Converge Shivam Kumar
2021-10-26 16:35 ` [PATCH 1/6] Define data structures needed for dirty quota migration Shivam Kumar
2021-10-26 16:35 ` [PATCH 2/6] Allocate memory for dirty quota context and initialize dirty quota migration flag Shivam Kumar
2021-10-27 4:50 ` kernel test robot
2021-10-27 7:31 ` kernel test robot
2021-10-26 16:35 ` [PATCH 3/6] Add dirty quota migration capability and handle vCPU page fault for dirty quota context Shivam Kumar
2021-10-27 7:19 ` kernel test robot
2021-10-26 16:35 ` [PATCH 4/6] Increment dirty counter for vmexit due to page write fault Shivam Kumar
2021-10-26 16:35 ` Shivam Kumar [this message]
2021-10-26 16:35 ` [PATCH 6/6] Free space allocated for the vCPU's dirty quota context upon destroy Shivam Kumar
2021-11-14 14:57 [PATCH 0/6] KVM: Dirty Quota-Based VM Live Migration Auto-Converge Shivam Kumar
2021-11-14 14:57 ` [PATCH 5/6] Exit to userspace when dirty quota is full Shivam Kumar
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