linux-kernel - [PATCH v5 13/30] KVM: Add arch hook for resume event

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Date:   Thu, 22 Sep 2022 11:20:42 -0700
From:   isaku.yamahata@...el.com
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>, Will Deacon <will@...nel.org>
Cc:     isaku.yamahata@...el.com, isaku.yamahata@...il.com,
        Kai Huang <kai.huang@...el.com>, Chao Gao <chao.gao@...el.com>,
        Atish Patra <atishp@...shpatra.org>,
        Shaokun Zhang <zhangshaokun@...ilicon.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Huang Ying <ying.huang@...el.com>,
        Huacai Chen <chenhuacai@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Borislav Petkov <bp@...en8.de>
Subject: [PATCH v5 13/30] KVM: Add arch hook for resume event

From: Isaku Yamahata <isaku.yamahata@...el.com>

Factor out the logic on resume event as arch callback.  Later kvm/x86 will
override it.

Suggested-by: Sean Christopherson <seanjc@...gle.com>
Signed-off-by: Isaku Yamahata <isaku.yamahata@...el.com>
---
 include/linux/kvm_host.h |  1 +
 virt/kvm/kvm_main.c      | 12 ++++++++----
 2 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 861aad8812ff..1adbf74e3047 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -1436,6 +1436,7 @@ static inline void kvm_create_vcpu_debugfs(struct kvm_vcpu *vcpu) {}
 
 int kvm_arch_reboot(int val);
 int kvm_arch_suspend(int usage_count);
+void kvm_arch_resume(int usage_count);
 
 int kvm_arch_hardware_enable(void);
 void kvm_arch_hardware_disable(void);
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 0ebe43a695e5..1270f88c2a1e 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1159,6 +1159,12 @@ int __weak kvm_arch_suspend(int usage_count)
 	return 0;
 }
 
+void __weak kvm_arch_resume(int usage_count)
+{
+	if (usage_count)
+		hardware_enable_nolock(NULL);
+}
+
 /*
  * Called just after removing the VM from the vm_list, but before doing any
  * other destruction.
@@ -5769,10 +5775,8 @@ static int kvm_suspend(void)
 
 static void kvm_resume(void)
 {
-	if (kvm_usage_count) {
-		lockdep_assert_not_held(&kvm_lock);
-		hardware_enable_nolock(NULL);
-	}
+	lockdep_assert_not_held(&kvm_lock);
+	kvm_arch_resume(kvm_usage_count);
 }
 
 static struct syscore_ops kvm_syscore_ops = {
-- 
2.25.1