linux-kernel - Re: [PATCH v15 21/23] x86/virt/tdx: Handle TDX interaction with ACPI S3 and deeper states

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Message-ID: <24b4c3dd-1975-492a-9b0c-83a08e2c2dcb@intel.com>
Date:   Thu, 30 Nov 2023 09:20:03 -0800
From:   Dave Hansen <dave.hansen@...el.com>
To:     Kai Huang <kai.huang@...el.com>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Cc:     x86@...nel.org, kirill.shutemov@...ux.intel.com,
        peterz@...radead.org, tony.luck@...el.com, tglx@...utronix.de,
        bp@...en8.de, mingo@...hat.com, hpa@...or.com, seanjc@...gle.com,
        pbonzini@...hat.com, rafael@...nel.org, david@...hat.com,
        dan.j.williams@...el.com, len.brown@...el.com, ak@...ux.intel.com,
        isaku.yamahata@...el.com, ying.huang@...el.com, chao.gao@...el.com,
        sathyanarayanan.kuppuswamy@...ux.intel.com, nik.borisov@...e.com,
        bagasdotme@...il.com, sagis@...gle.com, imammedo@...hat.com
Subject: Re: [PATCH v15 21/23] x86/virt/tdx: Handle TDX interaction with ACPI
 S3 and deeper states

On 11/9/23 03:55, Kai Huang wrote:
>  #include <asm/page.h>
> @@ -1402,6 +1404,15 @@ static int __init tdx_init(void)
>  		return -ENODEV;
>  	}
>  
> +	/*
> +	 * At this point, hibernation_available() indicates whether or
> +	 * not hibernation support has been permanently disabled.
> +	 */
> +	if (hibernation_available()) {
> +		pr_err("initialization failed: Hibernation support is enabled\n");
> +		return -ENODEV;
> +	}
> +
>  	err = register_memory_notifier(&tdx_memory_nb);
>  	if (err) {
>  		pr_err("initialization failed: register_memory_notifier() failed (%d)\n",
> @@ -1417,6 +1428,11 @@ static int __init tdx_init(void)
>  		return -ENODEV;
>  	}
>  
> +#if defined(CONFIG_ACPI) && defined(CONFIG_SUSPEND)
> +	pr_info("Disable ACPI S3. Turn off TDX in the BIOS to use ACPI S3.\n");
> +	acpi_suspend_lowlevel = NULL;
> +#endif

Rafael, are you OK with how this patch ended up?  An ack would be much
appreciated if so.