linux-kernel - Re: [PATCH v14 12/23] x86/virt/tdx: Allocate and set up PAMTs for TDMRs

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Message-ID: <33857df5-3639-4db4-acdd-7b692852b601@suse.com>
Date:   Tue, 24 Oct 2023 08:53:40 +0300
From:   Nikolay Borisov <nik.borisov@...e.com>
To:     Kai Huang <kai.huang@...el.com>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Cc:     x86@...nel.org, dave.hansen@...el.com,
        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, bagasdotme@...il.com,
        sagis@...gle.com, imammedo@...hat.com
Subject: Re: [PATCH v14 12/23] x86/virt/tdx: Allocate and set up PAMTs for
 TDMRs



On 17.10.23 г. 13:14 ч., Kai Huang wrote:

<snip>

>   arch/x86/Kconfig                  |   1 +
>   arch/x86/include/asm/shared/tdx.h |   1 +
>   arch/x86/virt/vmx/tdx/tdx.c       | 215 +++++++++++++++++++++++++++++-
>   arch/x86/virt/vmx/tdx/tdx.h       |   1 +
>   4 files changed, 213 insertions(+), 5 deletions(-)
> 
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index 864e43b008b1..ee4ac117aa3c 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -1946,6 +1946,7 @@ config INTEL_TDX_HOST
>   	depends on KVM_INTEL
>   	depends on X86_X2APIC
>   	select ARCH_KEEP_MEMBLOCK
> +	depends on CONTIG_ALLOC
>   	help
>   	  Intel Trust Domain Extensions (TDX) protects guest VMs from malicious
>   	  host and certain physical attacks.  This option enables necessary TDX
> diff --git a/arch/x86/include/asm/shared/tdx.h b/arch/x86/include/asm/shared/tdx.h
> index abcca86b5af3..cb59fe329b00 100644
> --- a/arch/x86/include/asm/shared/tdx.h
> +++ b/arch/x86/include/asm/shared/tdx.h
> @@ -58,6 +58,7 @@
>   #define TDX_PS_4K	0
>   #define TDX_PS_2M	1
>   #define TDX_PS_1G	2
> +#define TDX_PS_NR	(TDX_PS_1G + 1)

nit: I'd prefer if you those defines are turned into an enum and 
subsequently this enum type can be used in the definition of 
tdmr_get_pamt_sz(). However, at this point I consider this a 
bikeshedding and you can do that iff you are going to respin the series 
due to other feedback as well.

<snip>