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[129.215.164.122]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3a06d4a8150sm2199951f8f.7.2025.04.24.07.14.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 24 Apr 2025 07:14:26 -0700 (PDT) From: Karim Manaouil To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev Cc: Karim Manaouil , Alexander Graf , Alex Elder , Catalin Marinas , Fuad Tabba , Joey Gouly , Jonathan Corbet , Marc Zyngier , Mark Brown , Mark Rutland , Oliver Upton , Paolo Bonzini , Prakruthi Deepak Heragu , Quentin Perret , Rob Herring , Srinivas Kandagatla , Srivatsa Vaddagiri , Will Deacon , Haripranesh S , Carl van Schaik , Murali Nalajala , Sreenivasulu Chalamcharla , Trilok Soni , Stefan Schmidt Subject: [RFC PATCH 31/34] gunyah: allow userspace to set boot cpu context Date: Thu, 24 Apr 2025 15:13:38 +0100 Message-Id: <20250424141341.841734-32-karim.manaouil@linaro.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250424141341.841734-1-karim.manaouil@linaro.org> References: <20250424141341.841734-1-karim.manaouil@linaro.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Allow userspace hypervisor (e.g. Qemu) to set the context of the boot cpu. At the moment, only the program counter (PC) is needed. Signed-off-by: Karim Manaouil --- arch/arm64/kvm/gunyah.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/arch/arm64/kvm/gunyah.c b/arch/arm64/kvm/gunyah.c index e8037d636e8f..df922be2429e 100644 --- a/arch/arm64/kvm/gunyah.c +++ b/arch/arm64/kvm/gunyah.c @@ -1703,6 +1703,24 @@ static int gunyah_vm_rm_notification(struct notifier= _block *nb, } } =20 +/* + * We only need to set PC to start of kernel + */ +static int gunyah_vm_set_boot_ctx(struct gunyah_vm *ghvm) +{ + struct kvm_vcpu *vcpu =3D kvm_get_vcpu(&ghvm->kvm, 0); + u64 core_reg =3D KVM_REG_ARM64 | KVM_REG_SIZE_U64 | KVM_REG_ARM_CORE; + struct kvm_one_reg reg; + u64 *regaddr; + + reg.id =3D core_reg | KVM_REG_ARM_CORE_REG(regs.pc); + regaddr =3D core_reg_addr(vcpu, ®); + + /* We only need to set PC atm. regset is 1 */ + return gunyah_rm_vm_set_boot_context( + ghvm->rm, ghvm->vmid, 1, 0, *regaddr); +} + static void gunyah_vm_stop(struct gunyah_vm *ghvm) { int ret; @@ -1790,6 +1808,12 @@ static int gunyah_vm_start(struct gunyah_vm *ghvm) } ghvm->vm_status =3D GUNYAH_RM_VM_STATUS_READY; =20 + ret =3D gunyah_vm_set_boot_ctx(ghvm); + if (ret) { + pr_warn("Failed to setup boot context: %d\n", ret); + goto err; + } + ret =3D gunyah_rm_get_hyp_resources(ghvm->rm, ghvm->vmid, &resources); if (ret) { pr_warn("Failed to get hyp resources for VM: %d\n", ret); --=20 2.39.5