linux-kernel - [PATCH v2 4/7] KVM: arm64: Implement kvm_arch_flush_remote_tlbs

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Date:   Mon,  6 Feb 2023 17:23:37 +0000
From:   Raghavendra Rao Ananta <rananta@...gle.com>
To:     Oliver Upton <oupton@...gle.com>, Marc Zyngier <maz@...nel.org>,
        Ricardo Koller <ricarkol@...gle.com>,
        Reiji Watanabe <reijiw@...gle.com>,
        James Morse <james.morse@....com>,
        Alexandru Elisei <alexandru.elisei@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Will Deacon <will@...nel.org>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Catalin Marinas <catalin.marinas@....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 v2 4/7] KVM: arm64: Implement kvm_arch_flush_remote_tlbs_range()

Implement kvm_arch_flush_remote_tlbs_range() for arm64,
such that it can utilize the TLBI range based instructions
if supported.

Signed-off-by: Raghavendra Rao Ananta <rananta@...gle.com>
---
 arch/arm64/include/asm/kvm_host.h |  3 +++
 arch/arm64/kvm/mmu.c              | 15 +++++++++++++++
 2 files changed, 18 insertions(+)

diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index dee530d75b957..211fab0c1de74 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -1002,6 +1002,9 @@ 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 e98910a8d0af6..409cb187f4911 100644
--- a/arch/arm64/kvm/mmu.c
+++ b/arch/arm64/kvm/mmu.c
@@ -91,6 +91,21 @@ 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;
+
+	if (!system_supports_tlb_range())
+		return -EOPNOTSUPP;
+
+	start = start_gfn << PAGE_SHIFT;
+	end = (start_gfn + pages) << PAGE_SHIFT;
+
+	kvm_call_hyp(__kvm_tlb_flush_range_vmid_ipa, &kvm->arch.mmu,
+			start, end, KVM_PGTABLE_MAX_LEVELS - 1, 0);
+	return 0;
+}
+
 static bool kvm_is_device_pfn(unsigned long pfn)
 {
 	return !pfn_is_map_memory(pfn);
-- 
2.39.1.519.gcb327c4b5f-goog