linux-kernel - RE: [PATCH v4 6/6] x86/hyperv: Fix serial console interrupts for TDX guests

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Date:   Fri, 21 Apr 2023 03:54:05 +0000
From:   Dexuan Cui <decui@...rosoft.com>
To:     "Michael Kelley (LINUX)" <mikelley@...rosoft.com>,
        "ak@...ux.intel.com" <ak@...ux.intel.com>,
        "arnd@...db.de" <arnd@...db.de>, "bp@...en8.de" <bp@...en8.de>,
        "brijesh.singh@....com" <brijesh.singh@....com>,
        "dan.j.williams@...el.com" <dan.j.williams@...el.com>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        "hpa@...or.com" <hpa@...or.com>,
        "jane.chu@...cle.com" <jane.chu@...cle.com>,
        "kirill.shutemov@...ux.intel.com" <kirill.shutemov@...ux.intel.com>,
        KY Srinivasan <kys@...rosoft.com>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "luto@...nel.org" <luto@...nel.org>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "rostedt@...dmis.org" <rostedt@...dmis.org>,
        "sathyanarayanan.kuppuswamy@...ux.intel.com" 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        "seanjc@...gle.com" <seanjc@...gle.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "tony.luck@...el.com" <tony.luck@...el.com>,
        "wei.liu@...nel.org" <wei.liu@...nel.org>,
        "x86@...nel.org" <x86@...nel.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Tianyu Lan <Tianyu.Lan@...rosoft.com>
Subject: RE: [PATCH v4 6/6] x86/hyperv: Fix serial console interrupts for TDX
 guests

> From: Michael Kelley (LINUX) <mikelley@...rosoft.com>
> Sent: Tuesday, April 11, 2023 10:14 AM
> >  ...
> > + * Copy arch/x86/kernel/acpi/boot.c: acpi_generic_reduced_hw_init() but
> > doesn't change 'legacy_pic', so it keeps its default value 'default_legacy_pic' in
> > + * mp_config_acpi_legacy_irqs(), which sees a non-zero nr_legacy_irqs(),
> > and eventually serial console interrupts can work properly.
> 
> I had a little trouble parsing this comment.  Slightly better wording is:
> 
>  * Clone arch/x86/kernel/acpi/boot.c: acpi_generic_reduced_hw_init()
> here,
>     * except don't change 'legacy_pic'.  It keeps its default value
> 'default_legacy_pic'.
>     * mp_config_acpi_legacy_irqs() sees a non-zero nr_legacy_irqs(), and
>     * eventually serial console interrupts can work properly.
> 
> Otherwise,
> 
> Reviewed-by: Michael Kelley <mikelley@...rosoft.com>

Thanks! Will use this in v5.