linux-kernel - [PATCH RFC 1/4] KVM: Provide kvm_flush_remote_tlbs

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Message-Id: <20200207223520.735523-2-peterx@redhat.com>
Date:   Fri,  7 Feb 2020 17:35:17 -0500
From:   Peter Xu <peterx@...hat.com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     Sean Christopherson <sean.j.christopherson@...el.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        linux-mips@...r.kernel.org, peterx@...hat.com,
        Vitaly Kuznetsov <vkuznets@...hat.com>
Subject: [PATCH RFC 1/4] KVM: Provide kvm_flush_remote_tlbs_common()

It's exactly kvm_flush_remote_tlbs() now but a internal wrapper of the
common code path.  With this, an arch can then optionally select
CONFIG_HAVE_KVM_ARCH_TLB_FLUSH_ALL=y and will be able to use the
common flushing code.

Signed-off-by: Peter Xu <peterx@...hat.com>
---
 include/linux/kvm_host.h |  1 +
 virt/kvm/kvm_main.c      | 10 ++++++++--
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 6d5331b0d937..915df64125f9 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -798,6 +798,7 @@ int kvm_vcpu_yield_to(struct kvm_vcpu *target);
 void kvm_vcpu_on_spin(struct kvm_vcpu *vcpu, bool usermode_vcpu_not_eligible);
 
 void kvm_flush_remote_tlbs(struct kvm *kvm);
+void kvm_flush_remote_tlbs_common(struct kvm *kvm);
 void kvm_reload_remote_mmus(struct kvm *kvm);
 
 bool kvm_make_vcpus_request_mask(struct kvm *kvm, unsigned int req,
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index eb3709d55139..9c7b39b7bb21 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -302,8 +302,7 @@ bool kvm_make_all_cpus_request(struct kvm *kvm, unsigned int req)
 	return called;
 }
 
-#ifndef CONFIG_HAVE_KVM_ARCH_TLB_FLUSH_ALL
-void kvm_flush_remote_tlbs(struct kvm *kvm)
+void kvm_flush_remote_tlbs_common(struct kvm *kvm)
 {
 	/*
 	 * Read tlbs_dirty before setting KVM_REQ_TLB_FLUSH in
@@ -327,6 +326,13 @@ void kvm_flush_remote_tlbs(struct kvm *kvm)
 		++kvm->stat.remote_tlb_flush;
 	cmpxchg(&kvm->tlbs_dirty, dirty_count, 0);
 }
+EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs_common);
+
+#ifndef CONFIG_HAVE_KVM_ARCH_TLB_FLUSH_ALL
+void kvm_flush_remote_tlbs(struct kvm *kvm)
+{
+	kvm_flush_remote_tlbs_common(kvm);
+}
 EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs);
 #endif
 
-- 
2.24.1