linux-kernel - Re: [PATCH v7 17/30] LoongArch: KVM: Implement virtual machine tlb operations

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Date:   Wed, 19 Apr 2023 16:59:00 +0800
From:   Tianrui Zhao <zhaotianrui@...ngson.cn>
To:     Huacai Chen <chenhuacai@...nel.org>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        WANG Xuerui <kernel@...0n.name>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        loongarch@...ts.linux.dev, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, Jens Axboe <axboe@...nel.dk>,
        Mark Brown <broonie@...nel.org>,
        Alex Deucher <alexander.deucher@....com>,
        Oliver Upton <oliver.upton@...ux.dev>, maobibo@...ngson.cn,
        Xi Ruoyao <xry111@...111.site>
Subject: Re: [PATCH v7 17/30] LoongArch: KVM: Implement virtual machine tlb
 operations



在 2023年04月19日 10:02, Huacai Chen 写道:
> Hi, Tianrui,
>
> On Mon, Apr 17, 2023 at 5:47 PM Tianrui Zhao <zhaotianrui@...ngson.cn> wrote:
>> Implement loongarch virtual machine tlb operations such as flush tlb by
>> specific gpa parameter and flush all of the virt machines tlb.
> Use LoongArch instead of loongarch in commit messages and comments, please.
>
> Huacai
Ok, I will replace loongarch with LoongArch, thanks.

Thanks
Tianrui Zhao
>> Signed-off-by: Tianrui Zhao <zhaotianrui@...ngson.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 000000000000..66e116cf2486
>> --- /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
>>