linux-kernel - Re: [RFC 04/14] x86/apic: Initialize APIC backing page for Secure AVIC

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Message-ID: <e4e3efc6-9389-4adc-b33a-475fb9ad7520@amd.com>
Date: Sat, 9 Nov 2024 22:21:12 +0530
From: Neeraj Upadhyay <Neeraj.Upadhyay@....com>
To: Borislav Petkov <bp@...en8.de>
Cc: linux-kernel@...r.kernel.org, tglx@...utronix.de, mingo@...hat.com,
 dave.hansen@...ux.intel.com, Thomas.Lendacky@....com, nikunj@....com,
 Santosh.Shukla@....com, Vasant.Hegde@....com, Suravee.Suthikulpanit@....com,
 David.Kaplan@....com, x86@...nel.org, hpa@...or.com, peterz@...radead.org,
 seanjc@...gle.com, pbonzini@...hat.com, kvm@...r.kernel.org
Subject: Re: [RFC 04/14] x86/apic: Initialize APIC backing page for Secure
 AVIC


>> and provide a secure avic specific function here (will do the same for
>> sev_ghcb_msr_write(), which comes later in this series).
>>
>> "x2avic" terminology is not used in guest code. As this function only has secure
>> avic user, does secure_avic_ghcb_msr_read() work?
> 
> That or "savic_..."
> 

Ok sure.

>>>> +enum lapic_lvt_entry {
>>>
>>> What's that enum for?
>>
>> It's used in init_backing_page()
> 
> Then use it properly:
> 

I will update it.

> diff --git a/arch/x86/kernel/apic/x2apic_savic.c b/arch/x86/kernel/apic/x2apic_savic.c
> index 99151be4e173..1753c4a71b50 100644
> --- a/arch/x86/kernel/apic/x2apic_savic.c
> +++ b/arch/x86/kernel/apic/x2apic_savic.c
> @@ -200,8 +200,8 @@ static void x2apic_savic_send_IPI_mask_allbutself(const struct cpumask *mask, in
>  
>  static void init_backing_page(void *backing_page)
>  {
> +	enum lapic_lvt_entry i;
>  	u32 val;
> -	int i;
>  
>  	val = read_msr_from_hv(APIC_LVR);
>  	set_reg(backing_page, APIC_LVR, val);
> 
>>>> +		pr_err("Secure AVIC msr (%#llx) read returned error (%d)\n", msr, ret);
>>>
>>> Prepend "0x" to the format specifier.
>>>
>>
>> Using '#' prepends "0x". Am I missing something here?
> 
> Let's use the common thing pls even if the alternate form works too:
> 

Ok sure, will change to "0x".



- Neeraj

> $ git grep "\"%#" | wc -l
> 411
> $ git grep "\"0x" | wc -l
> 112823
>