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Date: Tue, 4 Aug 2026 16:57:27 +0800
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Cc: cui.tao@linux.dev, WANG Xuerui <kernel@xen0n.name>,
 Rong Bao <rong.bao@csmantle.top>, loongarch@lists.linux.dev,
 linux-kernel@vger.kernel.org, stable@vger.kernel.org
Subject: Re: [PATCH] LoongArch: Fix acpi_package_ids array overflow
To: Bibo Mao <maobibo@loongson.cn>, Huacai Chen <chenhuacai@kernel.org>
References: <20260804075719.1137338-1-maobibo@loongson.cn>
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From: Tao Cui <cui.tao@linux.dev>
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在 2026/8/4 15:57, Bibo Mao 写道:
> With LoongArch virt machine, one typical setting is one core per socket,
> there will max 256 sockets on one VM. With PPTT acpi table, array
> acpi_package_ids will be overflowed.
> 
> Here change array size of acpi_package_ids with max value of
> MAX_PACKAGES and KVM_MAX_VCPUS.
> 
> Fixes: 4e8f58620f67 ("LoongArch: Retrieve CPU package ID from PPTT when available")
> Cc: stable@vger.kernel.org
> Signed-off-by: Bibo Mao <maobibo@loongson.cn>
> ---
>  arch/loongarch/kernel/acpi.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/loongarch/kernel/acpi.c b/arch/loongarch/kernel/acpi.c
> index 873e90990771..cb454ee92b20 100644
> --- a/arch/loongarch/kernel/acpi.c
> +++ b/arch/loongarch/kernel/acpi.c
> @@ -13,6 +13,7 @@
>  #include <linux/export.h>
>  #include <linux/irq.h>
>  #include <linux/irqdomain.h>
> +#include <linux/kvm_host.h>
>  #include <linux/memblock.h>
>  #include <linux/of_fdt.h>
>  #include <linux/serial_core.h>
> @@ -202,7 +203,7 @@ static void __init acpi_process_madt(void)
>  
>  int pptt_enabled;
>  static int acpi_nr_packages;
> -static int acpi_package_ids[MAX_PACKAGES];
> +static int acpi_package_ids[MAX(MAX_PACKAGES, KVM_MAX_VCPUS)];
>  
>  int __init parse_acpi_topology(void)
>  {
> 
> base-commit: 075b74841bd0065a3bda3440873c747938e69b68
Reviewed-by: Tao Cui <cuitao@kylinos.cn>