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

[Tianrui Zhao]

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@xxxxxxxxxxx> 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@xxxxxxxxxxx>
> > ---
> >   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