linux-kernel - Re: [PATCH v3 0/8] Support ACPI PSP on Hyper-V

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Message-ID: <ceece3a9-bbe9-f8d4-f446-c2c8dd285a8e@linux.microsoft.com>
Date:   Wed, 5 Apr 2023 10:50:10 +0200
From:   Jeremi Piotrowski <jpiotrowski@...ux.microsoft.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org,
        Brijesh Singh <brijesh.singh@....com>,
        Tom Lendacky <thomas.lendacky@....com>,
        "Kalra, Ashish" <ashish.kalra@....com>,
        linux-crypto@...r.kernel.org,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>, linux-acpi@...r.kernel.org,
        Ingo Molnar <mingo@...hat.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org
Subject: Re: [PATCH v3 0/8] Support ACPI PSP on Hyper-V

On 4/2/2023 5:44 PM, Borislav Petkov wrote:
> On Fri, Mar 24, 2023 at 06:10:09PM +0100, Jeremi Piotrowski wrote:
>> Since the AMD PSP is a privileged device, there is a desire to not have to trust the
>> ACPI stack,
> 
> And yet you do:
> 
> +	err = acpi_parse_aspt(&res[0], &pdata);
> +	if (err)
> +		return err;
> 
> You don't trust the ACPI stack, and yet you're parsing an ACPI table?!?!
> You have to make up your mind here.
> 
> Btw, you still haven't answered my question about doing:
> 
> 	devm_request_irq(dev, 9, ..)
> 
> where 9 is the default ACPI interrupt.
> 
> You can have some silly table tell you what to map or you can simply map
> IRQ 9 and be done with it. In this second case you can *really* not
> trust ACPI because you know which IRQ it is.
> 

Sorry I broke threading. Meant to post this email:
https://lore.kernel.org/lkml/35f6b321-1668-2b62-cb47-3f3760be2e1d@linux.microsoft.com/#t
as a reply to *this* one.

Jeremi