linux-kernel - [PATCH RFC 4/4] KVM: MIPS: Define arch-specific kvm_flush_remote

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Message-Id: <20200207223520.735523-5-peterx@redhat.com>
Date:   Fri,  7 Feb 2020 17:35:20 -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 4/4] KVM: MIPS: Define arch-specific kvm_flush_remote_tlbs()

Select HAVE_KVM_ARCH_TLB_FLUSH_ALL for MIPS to define its own
kvm_flush_remote_tlbs().  It's as simple as calling the
flush_shadow_all(kvm) hook.  Then replace all the flush_shadow_all()
calls to use this KVM generic API to do TLB flush.

Signed-off-by: Peter Xu <peterx@...hat.com>
---
 arch/mips/kvm/Kconfig |  1 +
 arch/mips/kvm/mips.c  | 22 ++++++++++------------
 2 files changed, 11 insertions(+), 12 deletions(-)

diff --git a/arch/mips/kvm/Kconfig b/arch/mips/kvm/Kconfig
index eac25aef21e0..8a06f660d39e 100644
--- a/arch/mips/kvm/Kconfig
+++ b/arch/mips/kvm/Kconfig
@@ -26,6 +26,7 @@ config KVM
 	select KVM_MMIO
 	select MMU_NOTIFIER
 	select SRCU
+	select HAVE_KVM_ARCH_TLB_FLUSH_ALL
 	---help---
 	  Support for hosting Guest kernels.
 
diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
index 1d5e7ffda746..518020b466bf 100644
--- a/arch/mips/kvm/mips.c
+++ b/arch/mips/kvm/mips.c
@@ -194,13 +194,16 @@ int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot,
 	return 0;
 }
 
+void kvm_flush_remote_tlbs(struct kvm *kvm)
+{
+	kvm_mips_callbacks->flush_shadow_all(kvm);
+}
+
 void kvm_arch_flush_shadow_all(struct kvm *kvm)
 {
 	/* Flush whole GPA */
 	kvm_mips_flush_gpa_pt(kvm, 0, ~0);
-
-	/* Let implementation do the rest */
-	kvm_mips_callbacks->flush_shadow_all(kvm);
+	kvm_flush_remote_tlbs(kvm);
 }
 
 void kvm_arch_flush_shadow_memslot(struct kvm *kvm,
@@ -215,8 +218,7 @@ void kvm_arch_flush_shadow_memslot(struct kvm *kvm,
 	/* Flush slot from GPA */
 	kvm_mips_flush_gpa_pt(kvm, slot->base_gfn,
 			      slot->base_gfn + slot->npages - 1);
-	/* Let implementation do the rest */
-	kvm_mips_callbacks->flush_shadow_all(kvm);
+	kvm_flush_remote_tlbs(kvm);
 	spin_unlock(&kvm->mmu_lock);
 }
 
@@ -258,7 +260,7 @@ void kvm_arch_commit_memory_region(struct kvm *kvm,
 					new->base_gfn + new->npages - 1);
 		/* Let implementation do the rest */
 		if (needs_flush)
-			kvm_mips_callbacks->flush_shadow_all(kvm);
+			kvm_flush_remote_tlbs(kvm);
 		spin_unlock(&kvm->mmu_lock);
 	}
 }
@@ -1001,9 +1003,7 @@ int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
 	if (flush) {
 		slots = kvm_memslots(kvm);
 		memslot = id_to_memslot(slots, log->slot);
-
-		/* Let implementation handle TLB/GVA invalidation */
-		kvm_mips_callbacks->flush_shadow_all(kvm);
+		kvm_flush_remote_tlbs(kvm);
 	}
 
 	mutex_unlock(&kvm->slots_lock);
@@ -1024,9 +1024,7 @@ int kvm_vm_ioctl_clear_dirty_log(struct kvm *kvm, struct kvm_clear_dirty_log *lo
 	if (flush) {
 		slots = kvm_memslots(kvm);
 		memslot = id_to_memslot(slots, log->slot);
-
-		/* Let implementation handle TLB/GVA invalidation */
-		kvm_mips_callbacks->flush_shadow_all(kvm);
+		kvm_flush_remote_tlbs(kvm);
 	}
 
 	mutex_unlock(&kvm->slots_lock);
-- 
2.24.1