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    Subject[PATCH v2 17/29] LoongArch: KVM: Implement virtual machine tlb operations
    Date
    Implement loongarch virtual machine tlb operations such as flush tlb by
    specific gpa parameter and flush all of the virt machines tlb.

    Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
    ---
    arch/loongarch/kvm/tlb.c | 31 +++++++++++++++++++++++++++++++
    1 file changed, 31 insertions(+)
    create mode 100644 arch/loongarch/kvm/tlb.c

    diff --git a/arch/loongarch/kvm/tlb.c b/arch/loongarch/kvm/tlb.c
    new file mode 100644
    index 000000000..66e116cf2
    --- /dev/null
    +++ b/arch/loongarch/kvm/tlb.c
    @@ -0,0 +1,31 @@
    +// SPDX-License-Identifier: GPL-2.0
    +/*
    + * Copyright (C) 2020-2023 Loongson Technology Corporation Limited
    + */
    +
    +#include <linux/kvm_host.h>
    +#include <asm/tlb.h>
    +
    +int kvm_flush_tlb_gpa(struct kvm_vcpu *vcpu, unsigned long gpa)
    +{
    + preempt_disable();
    + gpa &= (PAGE_MASK << 1);
    + invtlb(INVTLB_GID_ADDR, read_csr_gstat() & CSR_GSTAT_GID, gpa);
    + preempt_enable();
    + return 0;
    +}
    +
    +/**
    + * 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);
    +}
    --
    2.31.1
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