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Mon, 30 Oct 2023 10:36:11 -0700 (PDT) X-Google-Smtp-Source: AGHT+IEboAELdFqaoOZREgnEhsC/lbRki6/0Jdh0l66f6RUru0wLk22AqSmUMVbSPZpU1ZFwEkh2hA== X-Received: by 2002:adf:ec4f:0:b0:32d:8357:42dd with SMTP id w15-20020adfec4f000000b0032d835742ddmr6883233wrn.68.1698687371568; Mon, 30 Oct 2023 10:36:11 -0700 (PDT) Received: from [192.168.1.174] ([151.81.68.207]) by smtp.googlemail.com with ESMTPSA id p14-20020a5d68ce000000b003253523d767sm8703507wrw.109.2023.10.30.10.36.08 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 30 Oct 2023 10:36:10 -0700 (PDT) Message-ID: Date: Mon, 30 Oct 2023 18:36:07 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v13 23/35] KVM: x86: Add support for "protected VMs" that can utilize private memory To: Sean Christopherson , Marc Zyngier , Oliver Upton , Huacai Chen , Michael Ellerman , Anup Patel , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexander Viro , Christian Brauner , "Matthew Wilcox (Oracle)" , Andrew Morton References: <20231027182217.3615211-1-seanjc@google.com> <20231027182217.3615211-24-seanjc@google.com> From: Paolo Bonzini Autocrypt: addr=pbonzini@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kvm@vger.kernel.org, David Hildenbrand , linux-kernel@vger.kernel.org, linux-mm@kvack.org, Chao Peng , linux-riscv@lists.infradead.org, Isaku Yamahata , Xiaoyao Li , Wang , Fuad Tabba , linux-arm-kernel@lists.infradead.org, Maciej Szmigiero , Michael Roth , Ackerley Tng , David Matlack , Vlastimil Babka , =?UTF-8?B?TWlja2HDq2wgU2FsYcO8?= =?UTF-8?Q?n?= , Isaku Yamahata , Quentin Perret , kvmarm@lists.linux.dev, linux-mips@vger.kernel.org, Jarkko Sakkinen , Yu Zhang , "Kirill A . Shutemov" , kvm-riscv@lists.infradead.org, linux-fsdevel@vger.kernel.org, Liam Merwick , Vishal A nnapurve , linuxppc-dev@lists.ozlabs.org, Xu Yilun , Anish Moorthy Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On 10/27/23 20:22, Sean Christopherson wrote: > Add a new x86 VM type, KVM_X86_SW_PROTECTED_VM, to serve as a development > and testing vehicle for Confidential (CoCo) VMs, and potentially to even > become a "real" product in the distant future, e.g. a la pKVM. > > The private memory support in KVM x86 is aimed at AMD's SEV-SNP and > Intel's TDX, but those technologies are extremely complex (understatement), > difficult to debug, don't support running as nested guests, and require > hardware that's isn't universally accessible. I.e. relying SEV-SNP or TDX > for maintaining guest private memory isn't a realistic option. > > At the very least, KVM_X86_SW_PROTECTED_VM will enable a variety of > selftests for guest_memfd and private memory support without requiring > unique hardware. > > Signed-off-by: Sean Christopherson Reviewed-by: Paolo Bonzini with one nit: > +--------------------- > + > +:Capability: KVM_CAP_MEMORY_ATTRIBUTES > +:Architectures: x86 > +:Type: system ioctl > + > +This capability returns a bitmap of support VM types. The 1-setting of bit @n s/support/supported/ Paolo