RISC-V: KVM: Cache gstage pgd_levels in struct kvm_gstage

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Gstage page-table helpers frequently chase gstage->kvm->arch to
fetch pgd_levels. This adds noise and repeats the same dereference
chain in hot paths.

Add pgd_levels to struct kvm_gstage and initialize it from kvm->arch
when setting up a gstage instance. Introduce kvm_riscv_gstage_init()
to centralize initialization and switch gstage code to use
gstage->pgd_levels.

Suggested-by: Anup Patel <anup@brainfault.org>
Signed-off-by: Fangyu Yu <fangyu.yu@linux.alibaba.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Reviewed-by: Nutty Liu <nutty.liu@hotmail.com>
Link: https://lore.kernel.org/r/20260403153019.9916-3-fangyu.yu@linux.alibaba.com
Signed-off-by: Anup Patel <anup@brainfault.org>

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Fangyu Yu 2026-04-03 23:30:17 +08:00 • committed by Anup Patel

parent efcac8424b

commit ec92248431

3 changed files with 26 additions and 46 deletions

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10

arch/riscv/include/asm/kvm_gstage.h

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12

arch/riscv/kvm/gstage.c

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50

arch/riscv/kvm/mmu.c

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