linux-kernel - [PATCH v3 3/7] KVM: arm64: Implement kvm_arch_flush_remote_tlbs

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Date:   Fri, 14 Apr 2023 17:29:18 +0000
From:   Raghavendra Rao Ananta <rananta@...gle.com>
To:     Oliver Upton <oliver.upton@...ux.dev>,
        Marc Zyngier <maz@...nel.org>,
        James Morse <james.morse@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>
Cc:     Ricardo Koller <ricarkol@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Jing Zhang <jingzhangos@...gle.com>,
        Colton Lewis <coltonlewis@...gle.com>,
        Raghavendra Rao Anata <rananta@...gle.com>,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: [PATCH v3 3/7] KVM: arm64: Implement kvm_arch_flush_remote_tlbs_range()

Implement kvm_arch_flush_remote_tlbs_range() for arm64
to invalidate the given range in the TLB.

Signed-off-by: Raghavendra Rao Ananta <rananta@...gle.com>
---
 arch/arm64/include/asm/kvm_host.h |  3 +++
 arch/arm64/kvm/mmu.c              | 11 +++++++++++
 2 files changed, 14 insertions(+)

diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index 17c215a2df7d7..075d3e6482e53 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -1044,6 +1044,9 @@ struct kvm *kvm_arch_alloc_vm(void);
 #define __KVM_HAVE_ARCH_FLUSH_REMOTE_TLBS
 int kvm_arch_flush_remote_tlbs(struct kvm *kvm);
 
+#define __KVM_HAVE_ARCH_FLUSH_REMOTE_TLBS_RANGE
+int kvm_arch_flush_remote_tlbs_range(struct kvm *kvm, gfn_t start_gfn, u64 pages);
+
 static inline bool kvm_vm_is_protected(struct kvm *kvm)
 {
 	return false;
diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c
index d0a0d3dca9316..e3673b4c10292 100644
--- a/arch/arm64/kvm/mmu.c
+++ b/arch/arm64/kvm/mmu.c
@@ -92,6 +92,17 @@ int kvm_arch_flush_remote_tlbs(struct kvm *kvm)
 	return 0;
 }
 
+int kvm_arch_flush_remote_tlbs_range(struct kvm *kvm, gfn_t start_gfn, u64 pages)
+{
+	phys_addr_t start, end;
+
+	start = start_gfn << PAGE_SHIFT;
+	end = (start_gfn + pages) << PAGE_SHIFT;
+
+	kvm_call_hyp(__kvm_tlb_flush_vmid_range, &kvm->arch.mmu, start, end);
+	return 0;
+}
+
 static bool kvm_is_device_pfn(unsigned long pfn)
 {
 	return !pfn_is_map_memory(pfn);
-- 
2.40.0.634.g4ca3ef3211-goog