Re: [PATCH] RISC-V: KVM: Fix G-stage page table memory leak on VM destroy

[James Morris]

On Sat, 31 Oct 2026, Yangyu Chen wrote:

> Fixes: 9d05c1fee837 ("RISC-V: KVM: Implement stage2 page table programming")
> Cc: stable@xxxxxxxxxxxxxxx
> Signed-off-by: Yangyu Chen <cyy@xxxxxxxxxxxx>

Tested-by: James Morris <jmorris@xxxxxxxxx>

Assisted by an LLM.

On a SpacemiT K3 CoM260 host (Sv39x4), a native port of your reproducer 
showed about 16 MiB lost per VM on Fedora's 7.3.1 kernel. With the same 
source rebuilt with this patch, each run averaged under 0.1 MiB lost per 
VM (130 measured VMs total), consistent with noise. Both figures count 
free pages held on the per-CPU lists as free.


-- 
James Morris
<jmorris@xxxxxxxxx>