[PATCH v3 06/12] RISC-V: KVM: Implement kvm_arch_flush_remote_tlbs_range()
Nutty Liu
liujingqi at lanxincomputing.com
Wed Jun 25 00:39:02 PDT 2025
On 6/18/2025 7:35 PM, Anup Patel wrote:
> The kvm_arch_flush_remote_tlbs_range() expected by KVM core can be
> easily implemented for RISC-V using kvm_riscv_hfence_gvma_vmid_gpa()
> hence provide it.
>
> Also with kvm_arch_flush_remote_tlbs_range() available for RISC-V, the
> mmu_wp_memory_region() can happily use kvm_flush_remote_tlbs_memslot()
> instead of kvm_flush_remote_tlbs().
>
> Reviewed-by: Atish Patra <atishp at rivosinc.com>
> Signed-off-by: Anup Patel <apatel at ventanamicro.com>
> ---
> arch/riscv/include/asm/kvm_host.h | 2 ++
> arch/riscv/kvm/mmu.c | 2 +-
> arch/riscv/kvm/tlb.c | 8 ++++++++
> 3 files changed, 11 insertions(+), 1 deletion(-)
>
> diff --git a/arch/riscv/include/asm/kvm_host.h b/arch/riscv/include/asm/kvm_host.h
> index ff1f76d6f177..6162575e2177 100644
> --- a/arch/riscv/include/asm/kvm_host.h
> +++ b/arch/riscv/include/asm/kvm_host.h
> @@ -43,6 +43,8 @@
> KVM_ARCH_REQ_FLAGS(5, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
> #define KVM_REQ_STEAL_UPDATE KVM_ARCH_REQ(6)
>
> +#define __KVM_HAVE_ARCH_FLUSH_REMOTE_TLBS_RANGE
> +
> #define KVM_HEDELEG_DEFAULT (BIT(EXC_INST_MISALIGNED) | \
> BIT(EXC_BREAKPOINT) | \
> BIT(EXC_SYSCALL) | \
> diff --git a/arch/riscv/kvm/mmu.c b/arch/riscv/kvm/mmu.c
> index 29f1bd853a66..a5387927a1c1 100644
> --- a/arch/riscv/kvm/mmu.c
> +++ b/arch/riscv/kvm/mmu.c
> @@ -344,7 +344,7 @@ static void gstage_wp_memory_region(struct kvm *kvm, int slot)
> spin_lock(&kvm->mmu_lock);
> gstage_wp_range(kvm, start, end);
> spin_unlock(&kvm->mmu_lock);
> - kvm_flush_remote_tlbs(kvm);
> + kvm_flush_remote_tlbs_memslot(kvm, memslot);
> }
>
> int kvm_riscv_gstage_ioremap(struct kvm *kvm, gpa_t gpa,
> diff --git a/arch/riscv/kvm/tlb.c b/arch/riscv/kvm/tlb.c
> index da98ca801d31..f46a27658c2e 100644
> --- a/arch/riscv/kvm/tlb.c
> +++ b/arch/riscv/kvm/tlb.c
> @@ -403,3 +403,11 @@ void kvm_riscv_hfence_vvma_all(struct kvm *kvm,
> make_xfence_request(kvm, hbase, hmask, KVM_REQ_HFENCE_VVMA_ALL,
> KVM_REQ_HFENCE_VVMA_ALL, NULL);
> }
> +
> +int kvm_arch_flush_remote_tlbs_range(struct kvm *kvm, gfn_t gfn, u64 nr_pages)
> +{
> + kvm_riscv_hfence_gvma_vmid_gpa(kvm, -1UL, 0,
> + gfn << PAGE_SHIFT, nr_pages << PAGE_SHIFT,
> + PAGE_SHIFT);
> + return 0;
> +}
Reviewed-by: Nutty Liu <liujingqi at lanxincomputing.com>
Thanks,
Nutty
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