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AJvYcCV98sl+ypsHyIMyHJsmu6ClsPas1tAEgGERjYVUCuwVFGv2F6hjqwaTTEBZVAeXAmUan8c=@vger.kernel.org X-Gm-Message-State: AOJu0Yystxv5TgTmtsgV0x2JW06yzV+sURH8TdtY8TJgm13I5DaAX9nu mfumJ/DmayJFaGBq9BBYx/iRaBkH/EqaP06faXp8Na6NgUXuBrmPXEnTrYG7qi+QQNbifzBBuJ2 uJn8OndM8Z+MPzoJGu7MveiTZJ+bZhdo= X-Gm-Gg: ASbGncvHC/jxLNiW1w+aj4Jz/XoB5KdTWKK/FVJUiBL7+jcgkwt5sgX00i5sB9zUbWf Ojao6RKlg8hPwz8JdSlSQETOqdd9j/aaacBIcufYGYzWCLLVbiYHxnFh1h7Jd+XmEfypk7apUJu 2L6KcdbacWNVQjMmZe3hWKcNRLtcIdhhEDMsJgWW5G2VpBS8dF1xmZ6uqzPuGHsJDupVktw+c+i GJ1GEVYT8kILVM= X-Google-Smtp-Source: AGHT+IFv6qUpm4FAbD0oyWkx7SS3q8QYKfFqmrpcSWlil7RPcS1OOxDkzcdvcbnJOeWsCP4nayUex8a2XghIhScitvw= X-Received: by 2002:a17:90b:558f:b0:312:639:a064 with SMTP id 98e67ed59e1d1-31c4f5af641mr25885834a91.28.1752554988399; Mon, 14 Jul 2025 21:49:48 -0700 (PDT) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 References: <20250709033242.267892-1-Neeraj.Upadhyay@amd.com> <20250709033242.267892-20-Neeraj.Upadhyay@amd.com> In-Reply-To: <20250709033242.267892-20-Neeraj.Upadhyay@amd.com> From: Tianyu Lan Date: Tue, 15 Jul 2025 12:49:12 +0800 X-Gm-Features: Ac12FXzoXpwXjmo15hPC3yFWbIJ0OVO_lPU5_xp67Cj16Rh1xCD3AXZHPFo_q9Q Message-ID: Subject: Re: [RFC PATCH v8 19/35] x86/apic: Initialize Secure AVIC APIC backing page To: Neeraj Upadhyay Cc: linux-kernel@vger.kernel.org, bp@alien8.de, tglx@linutronix.de, mingo@redhat.com, dave.hansen@linux.intel.com, Thomas.Lendacky@amd.com, nikunj@amd.com, Santosh.Shukla@amd.com, Vasant.Hegde@amd.com, Suravee.Suthikulpanit@amd.com, David.Kaplan@amd.com, x86@kernel.org, hpa@zytor.com, peterz@infradead.org, seanjc@google.com, pbonzini@redhat.com, kvm@vger.kernel.org, kirill.shutemov@linux.intel.com, huibo.wang@amd.com, naveen.rao@amd.com, kai.huang@intel.com Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, Jul 9, 2025 at 11:40=E2=80=AFAM Neeraj Upadhyay wrote: > > With Secure AVIC, the APIC backing page is owned and managed by guest. > Allocate and initialize APIC backing page for all guest CPUs. > > The NPT entry for a vCPU's APIC backing page must always be present > when the vCPU is running, in order for Secure AVIC to function. A > VMEXIT_BUSY is returned on VMRUN and the vCPU cannot be resumed if > the NPT entry for the APIC backing page is not present. To handle this, > notify GPA of the vCPU's APIC backing page to the hypervisor by using the > SVM_VMGEXIT_SECURE_AVIC GHCB protocol event. Before executing VMRUN, > the hypervisor makes use of this information to make sure the APIC backin= g > page is mapped in NPT. > > Co-developed-by: Kishon Vijay Abraham I > Signed-off-by: Kishon Vijay Abraham I > Signed-off-by: Neeraj Upadhyay > --- > Changes since v7: > - No change. Reviewed-by: Tianyu Lan --=20 Thanks Tianyu Lan