linux-kernel - [RFC PATCH 1/2] KVM: Add arch hooks for KVM syscore ops

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Message-ID: <20250623132714.965474-1-dwmw2@infradead.org>
Date: Mon, 23 Jun 2025 14:27:13 +0100
From: David Woodhouse <dwmw2@...radead.org>
To: Marc Zyngier <maz@...nel.org>,
	Oliver Upton <oliver.upton@...ux.dev>,
	Joey Gouly <joey.gouly@....com>,
	Suzuki K Poulose <suzuki.poulose@....com>,
	Zenghui Yu <yuzenghui@...wei.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Sebastian Ott <sebott@...hat.com>,
	Andre Przywara <andre.przywara@....com>,
	Thorsten Blum <thorsten.blum@...ux.dev>,
	Shameer Kolothum <shameerali.kolothum.thodi@...wei.com>,
	David Woodhouse <dwmw@...zon.co.uk>,
	linux-arm-kernel@...ts.infradead.org,
	kvmarm@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org
Subject: [RFC PATCH 1/2] KVM: Add arch hooks for KVM syscore ops

From: David Woodhouse <dwmw@...zon.co.uk>

Allow the architecture to hook kvm_shutdown(), kvm_suspend() and kvm_resume()

Signed-off-by: David Woodhouse <dwmw@...zon.co.uk>
---
 include/linux/kvm_host.h |  3 +++
 virt/kvm/kvm_main.c      | 17 +++++++++++++++++
 2 files changed, 20 insertions(+)

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 3bde4fb5c6aa..8e16b6c0d2ba 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -1622,6 +1622,9 @@ void kvm_arch_disable_virtualization(void);
  */
 int kvm_arch_enable_virtualization_cpu(void);
 void kvm_arch_disable_virtualization_cpu(void);
+void kvm_arch_shutdown(void);
+void kvm_arch_suspend(void);
+void kvm_arch_resume(void);
 #endif
 bool kvm_vcpu_has_events(struct kvm_vcpu *vcpu);
 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu);
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index eec82775c5bf..4af1d9943d39 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -5609,6 +5609,20 @@ static int kvm_offline_cpu(unsigned int cpu)
 	return 0;
 }
 
+__weak void kvm_arch_shutdown(void)
+{
+
+}
+
+__weak void kvm_arch_suspend(void)
+{
+
+}
+__weak void kvm_arch_resume(void)
+{
+
+}
+
 static void kvm_shutdown(void)
 {
 	/*
@@ -5625,6 +5639,7 @@ static void kvm_shutdown(void)
 	pr_info("kvm: exiting hardware virtualization\n");
 	kvm_rebooting = true;
 	on_each_cpu(kvm_disable_virtualization_cpu, NULL, 1);
+	kvm_arch_shutdown();
 }
 
 static int kvm_suspend(void)
@@ -5641,6 +5656,7 @@ static int kvm_suspend(void)
 	lockdep_assert_irqs_disabled();
 
 	kvm_disable_virtualization_cpu(NULL);
+	kvm_arch_suspend();
 	return 0;
 }
 
@@ -5649,6 +5665,7 @@ static void kvm_resume(void)
 	lockdep_assert_not_held(&kvm_usage_lock);
 	lockdep_assert_irqs_disabled();
 
+	kvm_arch_resume();
 	WARN_ON_ONCE(kvm_enable_virtualization_cpu());
 }
 
-- 
2.49.0