From: Binbin Wu <binbin.wu@linux.intel.com>
To: "Huang, Kai" <kai.huang@intel.com>,
"nik.borisov@suse.com" <nik.borisov@suse.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Cc: "Edgecombe, Rick P" <rick.p.edgecombe@intel.com>,
"Hansen, Dave" <dave.hansen@intel.com>,
"bp@alien8.de" <bp@alien8.de>, "x86@kernel.org" <x86@kernel.org>,
"peterz@infradead.org" <peterz@infradead.org>,
"hpa@zytor.com" <hpa@zytor.com>,
"mingo@redhat.com" <mingo@redhat.com>,
"Williams, Dan J" <dan.j.williams@intel.com>,
"kirill.shutemov@linux.intel.com"
<kirill.shutemov@linux.intel.com>,
"pbonzini@redhat.com" <pbonzini@redhat.com>,
"tglx@linutronix.de" <tglx@linutronix.de>,
"seanjc@google.com" <seanjc@google.com>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
"Yamahata, Isaku" <isaku.yamahata@intel.com>
Subject: Re: [PATCH 8/9] x86/virt/tdx: Exclude memory region hole within CMR as TDMR's reserved area
Date: Fri, 5 Jul 2024 11:00:20 +0800 [thread overview]
Message-ID: <5c3c81dc-ec15-4f7a-9807-a308082c9fc8@linux.intel.com> (raw)
In-Reply-To: <717ba4c65ba9f1243facfcced207404c910f2410.camel@intel.com>
On 6/19/2024 9:23 AM, Huang, Kai wrote:
[...]
>
>> furthermore the alignement checks
>> suggest it's actually some sanity checking function. Furthermore if we
>> have:"
>>
>> ORDINARY_CMR,EMPTY_CMR,ORDINARY_CMR
>>
>> (Is such a scenario even possible), in this case we'll ommit also the
>> last ordinary cmr region?
> It cannot happen.
>
> The fact is:
>
> 1) CMR base/size are 4KB aligned. This is architectural behaviour.
> 2) TDX architecturally supports 32 CMRs maximumly;
Do you think it's worth a comment to the definition of TDX_MAX_CMRS that
the number is architectural?
> 3) In practice, TDX can just report the 'NUM_CMRS' metadata field as 32,
> but there can be empty/null CMRs following valid CMRs.
> 4) A empty/null CMR between valid CMRs cannot happen.
>
>
next prev parent reply other threads:[~2024-07-05 3:00 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-06-16 12:01 [PATCH 0/9] TDX host: metadata reading tweaks, bug fix and info dump Kai Huang
2024-06-16 12:01 ` [PATCH 1/9] x86/virt/tdx: Rename _offset to _member for TD_SYSINFO_MAP() macro Kai Huang
2024-06-16 12:01 ` [PATCH 2/9] x86/virt/tdx: Unbind global metadata read with 'struct tdx_tdmr_sysinfo' Kai Huang
2024-06-18 11:23 ` Nikolay Borisov
2024-06-18 23:29 ` Huang, Kai
2024-06-16 12:01 ` [PATCH 3/9] x86/virt/tdx: Support global metadata read for all element sizes Kai Huang
2024-06-18 11:42 ` Nikolay Borisov
2024-06-18 23:28 ` Huang, Kai
2024-06-19 8:05 ` Nikolay Borisov
2024-06-19 9:51 ` Huang, Kai
2024-06-16 12:01 ` [PATCH 4/9] x86/virt/tdx: Abstract reading multiple global metadata fields as a helper Kai Huang
2024-06-18 11:45 ` Nikolay Borisov
2024-06-18 23:42 ` Huang, Kai
2024-06-16 12:01 ` [PATCH 5/9] x86/virt/tdx: Move field mapping table of getting TDMR info to function local Kai Huang
2024-06-18 11:47 ` Nikolay Borisov
2024-06-18 23:44 ` Huang, Kai
2024-06-16 12:01 ` [PATCH 6/9] x86/virt/tdx: Start to track all global metadata in one structure Kai Huang
2024-06-18 13:17 ` Nikolay Borisov
2024-06-18 23:54 ` Huang, Kai
2024-06-16 12:01 ` [PATCH 7/9] x86/virt/tdx: Print TDX module basic information Kai Huang
2024-06-18 13:52 ` Nikolay Borisov
2024-06-19 0:22 ` Huang, Kai
2024-06-16 12:01 ` [PATCH 8/9] x86/virt/tdx: Exclude memory region hole within CMR as TDMR's reserved area Kai Huang
2024-06-17 10:54 ` Chao Gao
2024-06-18 0:12 ` Huang, Kai
2024-06-18 15:10 ` Nikolay Borisov
2024-06-19 1:23 ` Huang, Kai
2024-06-19 4:58 ` Huang, Kai
2024-07-05 3:00 ` Binbin Wu [this message]
2024-07-05 9:36 ` Huang, Kai
2024-06-16 12:01 ` [PATCH 9/9] x86/virt/tdx: Don't initialize module that doesn't support NO_RBP_MOD feature Kai Huang
2024-06-18 15:12 ` Nikolay Borisov
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