linux-kernel - Re: [PATCH v2 5/5] riscv: kvm: use ".L" local labels in assembly when applicable

Open Source and information security mailing list archives

Message-ID: <CAK9=C2UTww1AcF+U+7MBiT5c7PVtQrQQN=tNszjse+AgJd6xCQ@mail.gmail.com>
Date:   Wed, 13 Dec 2023 11:46:30 +0530
From:   Anup Patel <apatel@...tanamicro.com>
To:     Clément Léger <cleger@...osinc.com>
Cc:     Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Anup Patel <anup@...infault.org>,
        Atish Patra <atishp@...shpatra.org>,
        Andrew Jones <ajones@...tanamicro.com>,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, kvm-riscv@...ts.infradead.org
Subject: Re: [PATCH v2 5/5] riscv: kvm: use ".L" local labels in assembly when applicable

On Tue, Oct 24, 2023 at 6:58 PM Clément Léger <cleger@...osinc.com> wrote:
>
> For the sake of coherency, use local labels in assembly when
> applicable. This also avoid kprobes being confused when applying a
> kprobe since the size of function is computed by checking where the
> next visible symbol is located. This might end up in computing some
> function size to be way shorter than expected and thus failing to apply
> kprobes to the specified offset.
>
> Signed-off-by: Clément Léger <cleger@...osinc.com>
> Reviewed-by: Andrew Jones <ajones@...tanamicro.com>

Queued this patch for Linux-6.8

Thanks,
Anup


> ---
>  arch/riscv/kvm/vcpu_switch.S | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/arch/riscv/kvm/vcpu_switch.S b/arch/riscv/kvm/vcpu_switch.S
> index 8b18473780ac..0c26189aa01c 100644
> --- a/arch/riscv/kvm/vcpu_switch.S
> +++ b/arch/riscv/kvm/vcpu_switch.S
> @@ -45,7 +45,7 @@ SYM_FUNC_START(__kvm_riscv_switch_to)
>         REG_L   t0, (KVM_ARCH_GUEST_SSTATUS)(a0)
>         REG_L   t1, (KVM_ARCH_GUEST_HSTATUS)(a0)
>         REG_L   t2, (KVM_ARCH_GUEST_SCOUNTEREN)(a0)
> -       la      t4, __kvm_switch_return
> +       la      t4, .Lkvm_switch_return
>         REG_L   t5, (KVM_ARCH_GUEST_SEPC)(a0)
>
>         /* Save Host and Restore Guest SSTATUS */
> @@ -113,7 +113,7 @@ SYM_FUNC_START(__kvm_riscv_switch_to)
>
>         /* Back to Host */
>         .align 2
> -__kvm_switch_return:
> +.Lkvm_switch_return:
>         /* Swap Guest A0 with SSCRATCH */
>         csrrw   a0, CSR_SSCRATCH, a0
>
> --
> 2.42.0
>
>
> --
> kvm-riscv mailing list
> kvm-riscv@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/kvm-riscv

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives