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AJvYcCU4dkQnk73icsX6k0b8UW2rN/JYFhNbOGsP7C5fWckBOSs9HgJoW8T3xkIEAhley6oIDbNXlwZQbk9/@lists.linux.dev X-Gm-Message-State: AOJu0YwZQb1H0DoyvPr9rtmZXnFPUyXH9BNTq/oFWnHxoqCYALI2B6Dj OmnAQB4S0OhV6vM/Yt4HcbZl2xlLmxH2ktZgliQ/LJU9ASuJ5W+h7i8xi0svXCFNSmU8sSIzxuB +RONxIw== X-Received: from pfrh12.prod.google.com ([2002:aa7:9f4c:0:b0:82a:6e03:a17f]) (user=seanjc job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6a00:3902:b0:82c:8c6a:682b with SMTP id d2e1a72fcca58-82d0da6a4efmr844869b3a.19.1775173562802; Thu, 02 Apr 2026 16:46:02 -0700 (PDT) Date: Thu, 2 Apr 2026 16:46:01 -0700 In-Reply-To: <4f0a5d5f7b743e3872547e14d02b894cd9f60550.camel@intel.com> Precedence: bulk X-Mailing-List: linux-coco@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260319005605.8965-1-yan.y.zhao@intel.com> <20260319005703.8983-1-yan.y.zhao@intel.com> <4f0a5d5f7b743e3872547e14d02b894cd9f60550.camel@intel.com> Message-ID: Subject: Re: [PATCH 1/2] x86/virt/tdx: Use PFN directly for mapping guest private memory From: Sean Christopherson To: Rick P Edgecombe Cc: "ackerleytng@google.com" , "pbonzini@redhat.com" , Yan Y Zhao , "dave.hansen@linux.intel.com" , "sagis@google.com" , Isaku Yamahata , "x86@kernel.org" , "kas@kernel.org" , "yilun.xu@linux.intel.com" , "bp@alien8.de" , "mingo@redhat.com" , "linux-kernel@vger.kernel.org" , Kai Huang , "kvm@vger.kernel.org" , "linux-coco@lists.linux.dev" , Xiaoyao Li , "tglx@kernel.org" , "binbin.wu@linux.intel.com" , Vishal Annapurve Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable On Thu, Apr 02, 2026, Rick P Edgecombe wrote: > On Thu, 2026-04-02 at 16:23 -0700, Ackerley Tng wrote: > > Yan Zhao writes: > >=20 > > >=20 > > > [...snip...] > > >=20 > > > -u64 tdh_mem_page_add(struct tdx_td *td, u64 gpa, struct page *page, = struct page *source, u64 *ext_err1, u64 *ext_err2) > > > +u64 tdh_mem_page_add(struct tdx_td *td, u64 gpa, kvm_pfn_t pfn, stru= ct page *source, > > > + =C2=A0=C2=A0=C2=A0=C2=A0 u64 *ext_err1, u64 *ext_err2) > > > =C2=A0 { > > > =C2=A0=C2=A0 struct tdx_module_args args =3D { > > > =C2=A0=C2=A0 .rcx =3D gpa, > > > =C2=A0=C2=A0 .rdx =3D tdx_tdr_pa(td), > > > - .r8 =3D page_to_phys(page), > > > + .r8 =3D PFN_PHYS(pfn), > > > =C2=A0=C2=A0 .r9 =3D page_to_phys(source), > >=20 > > Perhaps in some future patch, are we considering also passing pfn > > instead of struct page for source? Would we also update > > kvm_tdx->page_add_src to be a kvm_pfn_t? >=20 > Can you remind me, with the new API we were going to do an in-place add r= ight? > Then I'd wonder if we could maybe change tdh_mem_page_add() to only have = a > single pfn arg. No. In-place ADD will be supported, but it won't be mandatory. Practicall= y speaking, we can't make it mandatory unless we're willing to completely rip= out support for per-VM attributes (or at least, per-VM PRIVATE tracking). I su= ppose we could require in-place ADD when using per-gmem attributes, but I don't s= ee the point given that TDH_MEM_PAGE_ADD itself takes a source and dest.