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([2a10:bac0:b000:7579:7285:c2ff:fedd:7e3a]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-422f5f33bdasm188191855e9.8.2024.06.18.04.23.02 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 18 Jun 2024 04:23:03 -0700 (PDT) Message-ID: <6fd59803-252d-4126-91de-e65908fca602@suse.com> Date: Tue, 18 Jun 2024 14:23:01 +0300 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 2/9] x86/virt/tdx: Unbind global metadata read with 'struct tdx_tdmr_sysinfo' To: Kai Huang , linux-kernel@vger.kernel.org Cc: x86@kernel.org, dave.hansen@intel.com, dan.j.williams@intel.com, kirill.shutemov@linux.intel.com, rick.p.edgecombe@intel.com, peterz@infradead.org, tglx@linutronix.de, bp@alien8.de, mingo@redhat.com, hpa@zytor.com, seanjc@google.com, pbonzini@redhat.com, kvm@vger.kernel.org, isaku.yamahata@intel.com, binbin.wu@linux.intel.com References: <43c646d35088a0bada9fbbf8b731a7e4a44b22c0.1718538552.git.kai.huang@intel.com> From: Nikolay Borisov Content-Language: en-US In-Reply-To: <43c646d35088a0bada9fbbf8b731a7e4a44b22c0.1718538552.git.kai.huang@intel.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit On 16.06.24 г. 15:01 ч., Kai Huang wrote: > The TDX module provides a set of "global metadata fields". They report > things like TDX module version, supported features, and fields related > to create/run TDX guests and so on. > > For now the kernel only reads "TD Memory Region" (TDMR) related global > metadata fields to a 'struct tdx_tdmr_sysinfo' for initializing the TDX > module, and the metadata reading code can only work with that structure. > > Future changes will need to read other metadata fields that don't make > sense to populate to the "struct tdx_tdmr_sysinfo". It's essential to > provide a generic metadata read infrastructure which is not bound to any > specific structure. > > To start providing such infrastructure, unbind the metadata reading code > with the 'struct tdx_tdmr_sysinfo'. > > Note the kernel has a helper macro, TD_SYSINFO_MAP(), for marshaling the > metadata into the 'struct tdx_tdmr_sysinfo', and currently the macro > hardcodes the structure name. As part of unbinding the metadata reading > code with 'struct tdx_tdmr_sysinfo', it is extended to accept different > structures. > > Unfortunately, this will result in the usage of TD_SYSINFO_MAP() for > populating 'struct tdx_tdmr_sysinfo' to be changed to use the structure > name explicitly for each structure member and make the code longer. Add > a wrapper macro which hides the 'struct tdx_tdmr_sysinfo' internally to > make the code shorter thus better readability. > > Signed-off-by: Kai Huang > Reviewed-by: Kirill A. Shutemov > Reviewed-by: Binbin Wu > --- > arch/x86/virt/vmx/tdx/tdx.c | 25 ++++++++++++++----------- > 1 file changed, 14 insertions(+), 11 deletions(-) > > diff --git a/arch/x86/virt/vmx/tdx/tdx.c b/arch/x86/virt/vmx/tdx/tdx.c > index fbde24ea3b3e..854312e97eff 100644 > --- a/arch/x86/virt/vmx/tdx/tdx.c > +++ b/arch/x86/virt/vmx/tdx/tdx.c > @@ -272,9 +272,9 @@ static int read_sys_metadata_field(u64 field_id, u64 *data) > > static int read_sys_metadata_field16(u64 field_id, > int offset, > - struct tdx_tdmr_sysinfo *ts) > + void *stbuf) > { > - u16 *ts_member = ((void *)ts) + offset; > + u16 *st_member = stbuf + offset; This st_* prefix is completely arbitrary, Just name it "member" since this function can be used for any arbitrary member. > u64 tmp; > int ret; >