linux-kernel - [PATCH 2/4] KVM: introduce kvm_clear_all_cpus

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Date:   Sat, 22 Oct 2022 11:48:17 -0400
From:   Emanuele Giuseppe Esposito <eesposit@...hat.com>
To:     kvm@...r.kernel.org
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Jonathan Corbet <corbet@....net>,
        Maxim Levitsky <mlevitsk@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        David Hildenbrand <david@...hat.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Emanuele Giuseppe Esposito <eesposit@...hat.com>
Subject: [PATCH 2/4] KVM: introduce kvm_clear_all_cpus_request

Clear the given request in all vcpus of the VM with struct kvm.

Signed-off-by: Emanuele Giuseppe Esposito <eesposit@...hat.com>
---
 Documentation/virt/kvm/vcpu-requests.rst |  3 +++
 virt/kvm/kvm_main.c                      | 10 ++++++++++
 2 files changed, 13 insertions(+)

diff --git a/Documentation/virt/kvm/vcpu-requests.rst b/Documentation/virt/kvm/vcpu-requests.rst
index 31f62b64e07b..468410dfe84d 100644
--- a/Documentation/virt/kvm/vcpu-requests.rst
+++ b/Documentation/virt/kvm/vcpu-requests.rst
@@ -36,6 +36,9 @@ its TLB with a VCPU request.  The API consists of the following functions::
   /* Make request @req of all VCPUs of the VM with struct kvm @kvm. */
   bool kvm_make_all_cpus_request(struct kvm *kvm, unsigned int req);
 
+  /* Clear request @req of all VCPUs of the VM with struct kvm @kvm. */
+  void kvm_clear_all_cpus_request(struct kvm *kvm, unsigned int req);
+
 Typically a requester wants the VCPU to perform the activity as soon
 as possible after making the request.  This means most requests
 (kvm_make_request() calls) are followed by a call to kvm_vcpu_kick(),
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 584a5bab3af3..c080b93edc0d 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -355,6 +355,16 @@ bool kvm_make_all_cpus_request(struct kvm *kvm, unsigned int req)
 }
 EXPORT_SYMBOL_GPL(kvm_make_all_cpus_request);
 
+void kvm_clear_all_cpus_request(struct kvm *kvm, unsigned int req)
+{
+	unsigned long i;
+	struct kvm_vcpu *vcpu;
+
+	kvm_for_each_vcpu(i, vcpu, kvm)
+		kvm_clear_request(req, vcpu);
+}
+EXPORT_SYMBOL_GPL(kvm_clear_all_cpus_request);
+
 #ifndef CONFIG_HAVE_KVM_ARCH_TLB_FLUSH_ALL
 void kvm_flush_remote_tlbs(struct kvm *kvm)
 {
-- 
2.31.1