Re: [PATCH v17 04/10] x86: kdump: move xen_pv_domain() check and insert_resource() to setup_arch()

john.p.donnelly
2021-12-13T14:29:50Z

On 12/10/21 12:55 AM, Zhen Lei wrote:
> From: Chen Zhou <chenzhou10@huawei.com>
>
> We will make the functions reserve_crashkernel() as generic, the
> xen_pv_domain() check in reserve_crashkernel() is relevant only to
> x86, the same as insert_resource() in reserve_crashkernel[_low]().
> So move xen_pv_domain() check and insert_resource() to setup_arch()
> to keep them in x86.
>
> Suggested-by: Mike Rapoport <rppt@kernel.org>
> Signed-off-by: Chen Zhou <chenzhou10@huawei.com>
> Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
> Tested-by: John Donnelly <John.p.donnelly@oracle.com>
> Tested-by: Dave Kleikamp <dave.kleikamp@oracle.com>
> Acked-by: Baoquan He <bhe@redhat.com>

Acked-by: John Donnelly <john.p.donnelly@oracle.com>

> ---
> arch/x86/kernel/setup.c | 19 +++++++++++--------
> 1 file changed, 11 insertions(+), 8 deletions(-)
>
> diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
> index bb2a0973b98059e..7ae00716a208f82 100644
> --- a/arch/x86/kernel/setup.c
> +++ b/arch/x86/kernel/setup.c
> @@ -456,7 +456,6 @@ static int __init reserve_crashkernel_low(void)
>
> crashk_low_res.start = low_base;
> crashk_low_res.end = low_base + low_size - 1;
> - insert_resource(&iomem_resource, &crashk_low_res);
> #endif
> return 0;
> }
> @@ -480,11 +479,6 @@ static void __init reserve_crashkernel(void)
> high = true;
> }
>
> - if (xen_pv_domain()) {
> - pr_info("Ignoring crashkernel for a Xen PV domain\n");
> - return;
> - }
> -
> /* 0 means: find the address automatically */
> if (!crash_base) {
> /*
> @@ -531,7 +525,6 @@ static void __init reserve_crashkernel(void)
>
> crashk_res.start = crash_base;
> crashk_res.end = crash_base + crash_size - 1;
> - insert_resource(&iomem_resource, &crashk_res);
> }
> #else
> static void __init reserve_crashkernel(void)
> @@ -1143,7 +1136,17 @@ void __init setup_arch(char **cmdline_p)
> * Reserve memory for crash kernel after SRAT is parsed so that it
> * won't consume hotpluggable memory.
> */
> - reserve_crashkernel();
> + if (xen_pv_domain())
> + pr_info("Ignoring crashkernel for a Xen PV domain\n");
> + else {
> + reserve_crashkernel();
> +#ifdef CONFIG_KEXEC_CORE
> + if (crashk_res.end > crashk_res.start)
> + insert_resource(&iomem_resource, &crashk_res);
> + if (crashk_low_res.end > crashk_low_res.start)
> + insert_resource(&iomem_resource, &crashk_low_res);
> +#endif
> + }
>
> memblock_find_dma_reserve();
>