linux-kernel - Re: [PATCH 2/4] x86/tdx: Rename tdx_parse_tdinfo() to tdx

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Date: Sat, 9 Mar 2024 18:49:45 -0800
From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>
To: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
 tglx@...utronix.de, mingo@...hat.com, bp@...en8.de, dave.hansen@...el.com
Cc: hpa@...or.com, seanjc@...gle.com, ele.reshetova@...el.com,
 rick.p.edgecombe@...el.com, x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] x86/tdx: Rename tdx_parse_tdinfo() to tdx_setup()


On 3/9/24 1:02 PM, Kirill A. Shutemov wrote:
> Rename tdx_parse_tdinfo() to tdx_setup() and move setting NOTIFY_ENABLES
> there.
>
> The function will be extended to adjust TD configuration.
>
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> ---

Looks good to me.

Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>

>  arch/x86/coco/tdx/tdx.c | 13 ++++++++-----
>  1 file changed, 8 insertions(+), 5 deletions(-)
>
> diff --git a/arch/x86/coco/tdx/tdx.c b/arch/x86/coco/tdx/tdx.c
> index 5ffe5ef99536..afdaf46cabb9 100644
> --- a/arch/x86/coco/tdx/tdx.c
> +++ b/arch/x86/coco/tdx/tdx.c
> @@ -181,7 +181,7 @@ static void __noreturn tdx_panic(const char *msg)
>  		__tdx_hypercall(&args);
>  }
>  
> -static void tdx_parse_tdinfo(u64 *cc_mask)
> +static void tdx_setup(u64 *cc_mask)
>  {
>  	struct tdx_module_args args = {};
>  	unsigned int gpa_width;
> @@ -206,6 +206,9 @@ static void tdx_parse_tdinfo(u64 *cc_mask)
>  	gpa_width = args.rcx & GENMASK(5, 0);
>  	*cc_mask = BIT_ULL(gpa_width - 1);
>  
> +	/* Kernel does not use NOTIFY_ENABLES and does not need random #VEs */
> +	tdg_vm_wr(TDCS_NOTIFY_ENABLES, 0, -1ULL);
> +
>  	/*
>  	 * The kernel can not handle #VE's when accessing normal kernel
>  	 * memory.  Ensure that no #VE will be delivered for accesses to
> @@ -930,11 +933,11 @@ void __init tdx_early_init(void)
>  	setup_force_cpu_cap(X86_FEATURE_TSC_RELIABLE);
>  
>  	cc_vendor = CC_VENDOR_INTEL;
> -	tdx_parse_tdinfo(&cc_mask);
> -	cc_set_mask(cc_mask);
>  
> -	/* Kernel does not use NOTIFY_ENABLES and does not need random #VEs */
> -	tdg_vm_wr(TDCS_NOTIFY_ENABLES, 0, -1ULL);
> +	/* Configure the TD */
> +	tdx_setup(&cc_mask);
> +
> +	cc_set_mask(cc_mask);
>  
>  	/*
>  	 * All bits above GPA width are reserved and kernel treats shared bit

-- 
Sathyanarayanan Kuppuswamy
Linux Kernel Developer