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[v22,13/25] LoongArch: KVM: Implement virtual machine tlb operations

Message ID 20230927030959.3629941-14-zhaotianrui@loongson.cn (mailing list archive)
State New, archived
Headers show
Series Add KVM LoongArch support | expand

Commit Message

zhaotianrui Sept. 27, 2023, 3:09 a.m. UTC 
Implement LoongArch virtual machine tlb operations such as flush tlb by
specific gpa parameter and flush all of the virtual machine's tlbs.

Reviewed-by: Bibo Mao <maobibo@loongson.cn>
Tested-by: Huacai Chen <chenhuacai@loongson.cn>
Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
---
 arch/loongarch/kvm/tlb.c | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)
 create mode 100644 arch/loongarch/kvm/tlb.c
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Patch

diff --git a/arch/loongarch/kvm/tlb.c b/arch/loongarch/kvm/tlb.c
new file mode 100644
index 0000000000..02535df6b5
--- /dev/null
+++ b/arch/loongarch/kvm/tlb.c
@@ -0,0 +1,32 @@ 
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2020-2023 Loongson Technology Corporation Limited
+ */
+
+#include <linux/kvm_host.h>
+#include <asm/tlb.h>
+#include <asm/kvm_csr.h>
+
+/*
+ * kvm_flush_tlb_all() - Flush all root TLB entries for guests.
+ *
+ * Invalidate all entries including GVA-->GPA and GPA-->HPA mappings.
+ */
+void kvm_flush_tlb_all(void)
+{
+	unsigned long flags;
+
+	local_irq_save(flags);
+	invtlb_all(INVTLB_ALLGID, 0, 0);
+	local_irq_restore(flags);
+}
+
+void kvm_flush_tlb_gpa(struct kvm_vcpu *vcpu, unsigned long gpa)
+{
+	unsigned long flags;
+
+	local_irq_save(flags);
+	gpa &= (PAGE_MASK << 1);
+	invtlb(INVTLB_GID_ADDR, read_csr_gstat() & CSR_GSTAT_GID, gpa);
+	local_irq_restore(flags);
+}