From: Vitaly Kuznetsov <vkuznets@redhat.com>
To: Wei Liu <wei.liu@kernel.org>,
Linux on Hyper-V List <linux-hyperv@vger.kernel.org>
Cc: virtualization@lists.linux-foundation.org,
Linux Kernel List <linux-kernel@vger.kernel.org>,
Michael Kelley <mikelley@microsoft.com>,
Vineeth Pillai <viremana@linux.microsoft.com>,
Sunil Muthuswamy <sunilmut@microsoft.com>,
Nuno Das Neves <nunodasneves@linux.microsoft.com>,
Wei Liu <wei.liu@kernel.org>,
Lillian Grassin-Drake <ligrassi@microsoft.com>,
"K. Y. Srinivasan" <kys@microsoft.com>,
Haiyang Zhang <haiyangz@microsoft.com>,
Stephen Hemminger <sthemmin@microsoft.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
"maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)"
<x86@kernel.org>, "H. Peter Anvin" <hpa@zytor.com>
Subject: Re: [PATCH v2 10/17] x86/hyperv: implement and use hv_smp_prepare_cpus
Date: Thu, 12 Nov 2020 17:44:48 +0100 [thread overview]
Message-ID: <87y2j6wmm7.fsf@vitty.brq.redhat.com> (raw)
In-Reply-To: <20201105165814.29233-11-wei.liu@kernel.org>
Wei Liu <wei.liu@kernel.org> writes:
> Microsoft Hypervisor requires the root partition to make a few
> hypercalls to setup application processors before they can be used.
>
> Signed-off-by: Lillian Grassin-Drake <ligrassi@microsoft.com>
> Signed-off-by: Sunil Muthuswamy <sunilmut@microsoft.com>
> Co-Developed-by: Lillian Grassin-Drake <ligrassi@microsoft.com>
> Co-Developed-by: Sunil Muthuswamy <sunilmut@microsoft.com>
> Signed-off-by: Wei Liu <wei.liu@kernel.org>
> ---
> CPU hotplug and unplug is not yet supported in this setup, so those
> paths remain untouched.
> ---
> arch/x86/kernel/cpu/mshyperv.c | 27 +++++++++++++++++++++++++++
> 1 file changed, 27 insertions(+)
>
> diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c
> index f7633e1e4c82..4795e54550e6 100644
> --- a/arch/x86/kernel/cpu/mshyperv.c
> +++ b/arch/x86/kernel/cpu/mshyperv.c
> @@ -31,6 +31,7 @@
> #include <asm/reboot.h>
> #include <asm/nmi.h>
> #include <clocksource/hyperv_timer.h>
> +#include <asm/numa.h>
>
> struct ms_hyperv_info ms_hyperv;
> EXPORT_SYMBOL_GPL(ms_hyperv);
> @@ -208,6 +209,30 @@ static void __init hv_smp_prepare_boot_cpu(void)
> hv_init_spinlocks();
> #endif
> }
> +
> +static void __init hv_smp_prepare_cpus(unsigned int max_cpus)
> +{
> +#if defined(CONFIG_X86_64)
'#ifdef CONFIG_X86_64' is equally good as you can't compile x86_64
support as a module :-)
> + int i;
> + int ret;
> +
> + native_smp_prepare_cpus(max_cpus);
> +
So hypotetically, if hv_root_partition is true but 'ifdef CONFIG_X86_64'
is false, we won't even be doing native_smp_prepare_cpus()? This doesn't
sound right. Either move it outside of #ifdef or put the #ifdef around
'smp_ops.smp_prepare_cpus' assignment too.
> + for_each_present_cpu(i) {
> + if (i == 0)
> + continue;
> + ret = hv_call_add_logical_proc(numa_cpu_node(i), i, cpu_physical_id(i));
> + BUG_ON(ret);
> + }
> +
> + for_each_present_cpu(i) {
> + if (i == 0)
> + continue;
> + ret = hv_call_create_vp(numa_cpu_node(i), hv_current_partition_id, i, i);
> + BUG_ON(ret);
> + }
> +#endif
> +}
> #endif
>
> static void __init ms_hyperv_init_platform(void)
> @@ -364,6 +389,8 @@ static void __init ms_hyperv_init_platform(void)
>
> # ifdef CONFIG_SMP
> smp_ops.smp_prepare_boot_cpu = hv_smp_prepare_boot_cpu;
> + if (hv_root_partition)
> + smp_ops.smp_prepare_cpus = hv_smp_prepare_cpus;
> # endif
>
> /*
--
Vitaly
next prev parent reply other threads:[~2020-11-12 16:44 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-05 16:57 [PATCH v2 00/17] Introducing Linux root partition support for Microsoft Hypervisor Wei Liu
2020-11-05 16:57 ` [PATCH v2 01/17] asm-generic/hyperv: change HV_CPU_POWER_MANAGEMENT to HV_CPU_MANAGEMENT Wei Liu
2020-11-12 15:14 ` Vitaly Kuznetsov
2020-11-05 16:57 ` [PATCH v2 02/17] x86/hyperv: detect if Linux is the root partition Wei Liu
2020-11-05 19:16 ` kernel test robot
2020-11-12 11:42 ` Wei Liu
2020-11-12 11:46 ` Wei Liu
2020-11-12 12:22 ` Wei Liu
2020-11-05 20:23 ` kernel test robot
2020-11-12 15:16 ` Vitaly Kuznetsov
2020-11-12 15:51 ` Wei Liu
2020-11-05 16:58 ` [PATCH v2 03/17] Drivers: hv: vmbus: skip VMBus initialization if Linux is root Wei Liu
2020-11-12 15:24 ` Vitaly Kuznetsov
2020-11-13 14:51 ` Wei Liu
2020-11-05 16:58 ` [PATCH v2 04/17] iommu/hyperv: don't setup IRQ remapping when running as root Wei Liu
2020-11-12 15:27 ` Vitaly Kuznetsov
2020-11-13 14:53 ` Wei Liu
2020-11-05 16:58 ` [PATCH v2 05/17] clocksource/hyperv: use MSR-based access if " Wei Liu
2020-11-12 9:56 ` Daniel Lezcano
2020-11-12 11:24 ` Wei Liu
2020-11-12 11:40 ` Daniel Lezcano
2020-11-12 11:42 ` Wei Liu
2020-11-12 15:30 ` Vitaly Kuznetsov
2020-11-12 15:52 ` Wei Liu
2020-11-05 16:58 ` [PATCH v2 06/17] x86/hyperv: allocate output arg pages if required Wei Liu
2020-11-12 15:35 ` Vitaly Kuznetsov
2020-11-13 15:05 ` Wei Liu
2020-11-05 16:58 ` [PATCH v2 07/17] x86/hyperv: extract partition ID from Microsoft Hypervisor if necessary Wei Liu
2020-11-05 20:07 ` kernel test robot
2020-11-12 11:54 ` Wei Liu
2020-11-05 20:20 ` kernel test robot
2020-11-12 15:44 ` Vitaly Kuznetsov
2020-11-13 15:21 ` Wei Liu
2020-11-05 16:58 ` [PATCH v2 08/17] x86/hyperv: handling hypercall page setup for root Wei Liu
2020-11-12 15:51 ` Vitaly Kuznetsov
2020-11-13 15:33 ` Wei Liu
2020-11-13 16:09 ` Wei Liu
2020-11-13 16:16 ` Vitaly Kuznetsov
2020-11-05 16:58 ` [PATCH v2 09/17] x86/hyperv: provide a bunch of helper functions Wei Liu
2020-11-12 15:57 ` Vitaly Kuznetsov
2020-11-13 15:51 ` Wei Liu
2020-11-13 16:13 ` Vitaly Kuznetsov
2020-11-16 11:41 ` Wei Liu
2020-11-05 16:58 ` [PATCH v2 10/17] x86/hyperv: implement and use hv_smp_prepare_cpus Wei Liu
2020-11-12 16:44 ` Vitaly Kuznetsov [this message]
2020-11-13 15:56 ` Wei Liu
2020-11-05 16:58 ` [PATCH v2 11/17] asm-generic/hyperv: update hv_msi_entry Wei Liu
2020-11-05 16:58 ` [PATCH v2 12/17] asm-generic/hyperv: update hv_interrupt_entry Wei Liu
2020-11-05 16:58 ` [PATCH v2 13/17] asm-generic/hyperv: introduce hv_device_id and auxiliary structures Wei Liu
2020-11-05 16:58 ` [PATCH v2 14/17] asm-generic/hyperv: import data structures for mapping device interrupts Wei Liu
2020-11-05 16:58 ` [PATCH v2 15/17] x86/hyperv: implement an MSI domain for root partition Wei Liu
2020-11-12 13:50 ` Wei Liu
2020-11-05 16:58 ` [PATCH v2 16/17] x86/ioapic: export a few functions and data structures via io_apic.h Wei Liu
2020-11-12 11:39 ` Wei Liu
2020-11-05 16:58 ` [PATCH v2 17/17] x86/hyperv: handle IO-APIC when running as root Wei Liu
2020-11-12 16:56 ` Vitaly Kuznetsov
2020-11-13 16:01 ` Wei Liu
2020-11-13 16:04 ` Wei Liu
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