linux-kernel - Re: [PATCH v4 2/3] x86/tdx: Add TDX Guest event notify interrupt support

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Date:   Thu, 28 Apr 2022 10:57:29 -0700
From:   Sathyanarayanan Kuppuswamy 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
To:     Wander Lairson Costa <wander@...hat.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H . Peter Anvin" <hpa@...or.com>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Tony Luck <tony.luck@...el.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Kai Huang <kai.huang@...el.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 2/3] x86/tdx: Add TDX Guest event notify interrupt
 support



On 4/28/22 10:50 AM, Wander Lairson Costa wrote:
> On Fri, Apr 22, 2022 at 04:34:17PM -0700, Kuppuswamy Sathyanarayanan wrote:
> 
> [snip]
> 
>>   
>> +/*
>> + * tdx_hcall_set_notify_intr() - Setup Event Notify Interrupt Vector.
>> + *
>> + * @vector        : Vector address to be used for notification.
>> + *
>> + * return 0 on success or failure error number.
>> + */
>> +static long tdx_hcall_set_notify_intr(u8 vector)
>> +{
>> +	u64 ret;
>> +
>> +	/* Minimum vector value allowed is 32 */
>> +	if (vector < 32)
>> +		return -EINVAL;
>> +
>> +	/*
>> +	 * Register callback vector address with VMM. More details
>> +	 * about the ABI can be found in TDX Guest-Host-Communication
>> +	 * Interface (GHCI), sec titled
>> +	 * "TDG.VP.VMCALL<SetupEventNotifyInterrupt>".
>> +	 */
>> +	ret = _tdx_hypercall(TDVMCALL_SETUP_NOTIFY_INTR, vector, 0, 0, 0);
>> +
>> +	if (ret)
>> +		return ret;
>> +
>> +	return 0;
> 
> Just "return _tdx_hypercall(TDVMCALL_SETUP_NOTIFY_INTR, vector, 0, 0, 0);" does the job, doesn't it?
> And we can remove the declaration of ret.

Makes sense. I will remove it.

> 
> [snip]
> 
>>   
>> +#ifdef CONFIG_INTEL_TDX_GUEST
> 
> Just for consistency, can we change to "#if IS_ENABLED(CONFIG_INTEL_TDX_GUEST)"?

Ok. I will change it in next version.

> 
>> +DECLARE_IDTENTRY_SYSVEC(TDX_GUEST_EVENT_NOTIFY_VECTOR,	sysvec_tdx_event_notify);
>> +#endif
>> +
> 
> [snip]
> 

-- 
Sathyanarayanan Kuppuswamy
Linux Kernel Developer