linux-kernel - Re: [PATCH v2 0/2] LoongArch: KVM: Enhancement about PGD saving

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Message-ID: <CAAhV-H7-wGUjmWvRRV+zHMXXnc3ERzHp1DvQSFaQYx-SzPHiNg@mail.gmail.com>
Date: Sat, 1 Mar 2025 21:42:30 +0800
From: Huacai Chen <chenhuacai@...nel.org>
To: Bibo Mao <maobibo@...ngson.cn>
Cc: Tianrui Zhao <zhaotianrui@...ngson.cn>, WANG Xuerui <kernel@...0n.name>, kvm@...r.kernel.org, 
	loongarch@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 0/2] LoongArch: KVM: Enhancement about PGD saving

Series applied, thanks.

Huacai

On Wed, Feb 19, 2025 at 11:38 AM Bibo Mao <maobibo@...ngson.cn> wrote:
>
> There is enhancement about PGD saving about KVM hypervisor. Register
> LOONGARCH_CSR_PGDL is shared between host kernel and KVM hypervisor.
> For host kernel it is for user space pgd of VMM threads, secondary mmu
> for KVM hypervisor. Both are not changed after VM is created, so it
> can be saved as host_pgd and kvm_pgd in advanced.
>
> Also it fixes GPA size typo issue, it should cpu_vabits rather than
> cpu_vabits - 1. And inject data abort error to VM if it exceeds maximum.
> GPA size. For example there will be data abort when executing command:
>  # busybox devmem 0xc00000100008
>   Bus error (core dumped)
> Previous it is treated as MMIO address and let VMM handle this.
>
> ---
>   v1 ... v2:
>     1. Use name kvm_pgd rather than host_second_pgd for PGD of
>        hypervisor.
>     2. Fix GPA size typo issue and add page fault address checking.
>
> ---
> Bibo Mao (2):
>   LoongArch: KVM: Remove PGD saving during VM context switch
>   LoongArch: KVM: Fix GPA size issue about VM
>
>  arch/loongarch/include/asm/kvm_host.h |  2 ++
>  arch/loongarch/kernel/asm-offsets.c   |  4 +---
>  arch/loongarch/kvm/exit.c             |  6 ++++++
>  arch/loongarch/kvm/switch.S           | 12 ++----------
>  arch/loongarch/kvm/vcpu.c             |  8 ++++++++
>  arch/loongarch/kvm/vm.c               |  7 ++++++-
>  6 files changed, 25 insertions(+), 14 deletions(-)
>
>
> base-commit: 2408a807bfc3f738850ef5ad5e3fd59d66168996
> --
> 2.39.3
>