RISC-V: KVM: Split huge pages when dirty logging is enabled

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Split huge pages eagerly when enabling dirty logging. The goal is to
avoid doing it while faulting on write-protected pages, which
negatively impacts guest performance.

The benefits of eager page splitting are the same as in x86 and arm64,
added with commit a3fe5dbda0 ("KVM: x86/mmu: Split huge pages mapped
by the TDP MMU when dirty logging is enabled") and commit e7bf7a490c
("KVM: arm64: Split huge pages when dirty logging is enabled")

Signed-off-by: Wang Yechao <wang.yechao255@zte.com.cn>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20260731091215.1549430-3-wang.yechao255@zte.com.cn
Signed-off-by: Anup Patel <anup@brainfault.org>

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This commit is contained in:

Wang Yechao 2026-07-31 17:12:07 +08:00 • committed by Anup Patel

parent 6c7f75ef09

commit da870fdafa

3 changed files with 95 additions and 10 deletions

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6

arch/riscv/include/asm/kvm_gstage.h

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23

arch/riscv/kvm/gstage.c

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76

arch/riscv/kvm/mmu.c

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