linux-kernel - RE: [PATCH v16 059/116] KVM: TDX: Create initial guest memory

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Message-ID: <DS0PR11MB6373963DEA9B38DAAD38F7CBDCB4A@DS0PR11MB6373.namprd11.prod.outlook.com>
Date:   Mon, 20 Nov 2023 12:01:21 +0000
From:   "Wang, Wei W" <wei.w.wang@...el.com>
To:     Isaku Yamahata <isaku.yamahata@...ux.intel.com>
CC:     "Yamahata, Isaku" <isaku.yamahata@...el.com>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "isaku.yamahata@...il.com" <isaku.yamahata@...il.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        "Aktas, Erdem" <erdemaktas@...gle.com>,
        "Christopherson,, Sean" <seanjc@...gle.com>,
        "Shahar, Sagi" <sagis@...gle.com>,
        David Matlack <dmatlack@...gle.com>,
        "Huang, Kai" <kai.huang@...el.com>,
        Zhi Wang <zhi.wang.linux@...il.com>,
        "Chen, Bo2" <chen.bo@...el.com>,
        "Yuan, Hang" <hang.yuan@...el.com>,
        "Zhang, Tina" <tina.zhang@...el.com>,
        "gkirkpatrick@...gle.com" <gkirkpatrick@...gle.com>
Subject: RE: [PATCH v16 059/116] KVM: TDX: Create initial guest memory

On Saturday, November 18, 2023 4:15 AM, Isaku Yamahata wrote:
> Please refer to
> static int tdx_sept_set_private_spte(struct kvm *kvm, gfn_t gfn,
>                                      enum pg_level level, kvm_pfn_t pfn)
> 
> The guest memfd provides the page of gfn which is different from kvm_tdx-
> >source_pa. The function calls tdh_mem_page_add().
> 
> tdh_mem_page_add(kvm_tdx->tdr_pa, gpa, hpa, source_pa, &out);
> gpa: corresponds to the page from guest memfd
> source_pa: corresopnds to the page tdx_init_mem_region() pinned down.
> 
> tdh_mem_page_add() copies the page contents from source_pa to gpa and
> gives gpa to the TD guest. not source_pa.
> --
Yes, that's right, thanks.