Hi, Qi
Thank you for the fix.
> Date: Thu, 16 Dec 2021 15:09:49 +0800
> From: Qi Zheng <zhengqi.arch@xxxxxxxxxxxxx>
> To: k-hagio-ab@xxxxxxx, ptesarik@xxxxxxxx, lijiang@xxxxxxxxxx
> Cc: Qi Zheng <zhengqi.arch@xxxxxxxxxxxxx>, crash-utility@xxxxxxxxxx
> Subject: [PATCH] Fix pvops Xen detection for arm
> machine
> Message-ID: <20211216070949.17668-1-zhengqi.arch@xxxxxxxxxxxxx>
> Content-Type: text/plain; charset="US-ASCII"
>
> Since the xen_start_info on the arm/arm64 platform is static defined:
>
> ./arm/xen/enlighten.c:40:static struct start_info _xen_start_info;
> ./arm/xen/enlighten.c:41:struct start_info *xen_start_info = &_xen_start_info;
> ./arm/xen/enlighten.c:42:EXPORT_SYMBOL(xen_start_info);
>
The above variable is statically defined in the kernel, but the
'xen_vcpu_info' is also a static variable, why does the former not
work on arm machines, but the latter works well? Could you please
explain more details?
[linux]$ grep -nr "xen_vcpu_info" *
arch/arm/xen/enlighten.c:51:static struct vcpu_info __percpu *xen_vcpu_info;
Thanks.
Lianbo
> The is_pvops_xen() in commit 4badc6229c69f5cd9da7eb7bdf400a53ec6db01a
> ("Fix pvops Xen detection for kernels >= v4.20") always return TRUE.
> Then the following error will be reported because p2m_mid_missing
> and xen_p2m_addr are not defined:
>
> crash: cannot resolve "p2m_top"
>
> For the arm/arm64 platform, fix it by using xen_vcpu_info instead of
> xen_start_info to detect Xen dumps.
>
> Signed-off-by: Qi Zheng <zhengqi.arch@xxxxxxxxxxxxx>
> ---
> kernel.c | 15 +++++++++++----
> 1 file changed, 11 insertions(+), 4 deletions(-)
>
> diff --git a/kernel.c b/kernel.c
> index f4598ea..4b4d789 100644
> --- a/kernel.c
> +++ b/kernel.c
> @@ -10757,11 +10757,18 @@ is_pvops_xen(void)
> STREQ(sym, "paravirt_patch_default")))
> return TRUE;
>
> - if (symbol_exists("xen_start_info") &&
> - readmem(symbol_value("xen_start_info"), KVADDR, &addr,
> - sizeof(void *), "xen_start_info", RETURN_ON_ERROR) &&
> - addr != 0)
> + if (machine_type("ARM") || machine_type("ARM64")) {
> + if (symbol_exists("xen_vcpu_info") &&
> + readmem(symbol_value("xen_vcpu_info"), KVADDR, &addr,
> + sizeof(void *), "xen_vcpu_info", RETURN_ON_ERROR) &&
> + addr != 0)
> + return TRUE;
> + } else if (symbol_exists("xen_start_info") &&
> + readmem(symbol_value("xen_start_info"), KVADDR, &addr,
> + sizeof(void *), "xen_start_info", RETURN_ON_ERROR) &&
> + addr != 0) {
> return TRUE;
> + }
>
> return FALSE;
> }
> --
> 2.11.0
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