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AJvYcCUH/zZ0m0gDUGsAbyUj7jr6KoRjBShXGYq1/h8TmjzsusMyenIlq5X+Y/5vOxl2XRn313jGlqRz8gxc3qI=@vger.kernel.org X-Gm-Message-State: AOJu0Yyf4o3FbIuZ7k9H+iu76sKOBK3Zv+czUnbTV1DoaMxHeBI4YB/D IHiYRvJxwkQXEgj7SA+SZpr09Dh80UMQ1ztp4numJnKNSTOaTl311vAMwPupqmxEeOt7/bVKNOz Rn5Q5/zh/LktA32v+2geGrg== X-Received: from wrbgx14.prod.google.com ([2002:a05:6000:470e:b0:432:c17a:bedb]) (user=vdonnefort job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6000:2508:b0:435:932e:f932 with SMTP id ffacd0b85a97d-435c9a9bce1mr6750834f8f.7.1769424285177; Mon, 26 Jan 2026 02:44:45 -0800 (PST) Date: Mon, 26 Jan 2026 10:44:10 +0000 In-Reply-To: <20260126104419.1649811-1-vdonnefort@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260126104419.1649811-1-vdonnefort@google.com> X-Mailer: git-send-email 2.52.0.457.g6b5491de43-goog Message-ID: <20260126104419.1649811-22-vdonnefort@google.com> Subject: [PATCH v10 21/30] KVM: arm64: Initialise hyp_nr_cpus for nVHE hyp From: Vincent Donnefort To: rostedt@goodmis.org, mhiramat@kernel.org, mathieu.desnoyers@efficios.com, linux-trace-kernel@vger.kernel.org, maz@kernel.org, oliver.upton@linux.dev, joey.gouly@arm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com Cc: kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, jstultz@google.com, qperret@google.com, will@kernel.org, aneesh.kumar@kernel.org, kernel-team@android.com, linux-kernel@vger.kernel.org, Vincent Donnefort Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Knowing the number of CPUs is necessary for determining the boundaries of per-cpu variables, which will be used for upcoming hypervisor tracing. hyp_nr_cpus which stores this value, is only initialised for the pKVM hypervisor. Make it accessible for the nVHE hypervisor as well. With the kernel now responsible for initialising hyp_nr_cpus, the nr_cpus parameter is no longer needed in __pkvm_init. Signed-off-by: Vincent Donnefort diff --git a/arch/arm64/include/asm/kvm_hyp.h b/arch/arm64/include/asm/kvm_= hyp.h index 76ce2b94bd97..4bf63025061e 100644 --- a/arch/arm64/include/asm/kvm_hyp.h +++ b/arch/arm64/include/asm/kvm_hyp.h @@ -129,8 +129,7 @@ void __noreturn __hyp_do_panic(struct kvm_cpu_context *= host_ctxt, u64 spsr, #ifdef __KVM_NVHE_HYPERVISOR__ void __pkvm_init_switch_pgd(phys_addr_t pgd, unsigned long sp, void (*fn)(void)); -int __pkvm_init(phys_addr_t phys, unsigned long size, unsigned long nr_cpu= s, - unsigned long *per_cpu_base, u32 hyp_va_bits); +int __pkvm_init(phys_addr_t phys, unsigned long size, unsigned long *per_c= pu_base, u32 hyp_va_bits); void __noreturn __host_enter(struct kvm_cpu_context *host_ctxt); #endif =20 @@ -147,5 +146,6 @@ extern u64 kvm_nvhe_sym(id_aa64smfr0_el1_sys_val); extern unsigned long kvm_nvhe_sym(__icache_flags); extern unsigned int kvm_nvhe_sym(kvm_arm_vmid_bits); extern unsigned int kvm_nvhe_sym(kvm_host_sve_max_vl); +extern unsigned long kvm_nvhe_sym(hyp_nr_cpus); =20 #endif /* __ARM64_KVM_HYP_H__ */ diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c index 620a465248d1..be1fd6c5f74c 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -35,6 +35,7 @@ #include #include #include +#include #include #include #include @@ -2411,7 +2412,7 @@ static int __init do_pkvm_init(u32 hyp_va_bits) preempt_disable(); cpu_hyp_init_context(); ret =3D kvm_call_hyp_nvhe(__pkvm_init, hyp_mem_base, hyp_mem_size, - num_possible_cpus(), kern_hyp_va(per_cpu_base), + kern_hyp_va(per_cpu_base), hyp_va_bits); cpu_hyp_init_features(); =20 @@ -2620,6 +2621,8 @@ static int __init init_hyp_mode(void) kvm_nvhe_sym(kvm_arm_hyp_percpu_base)[cpu] =3D (unsigned long)page_addr; } =20 + kvm_nvhe_sym(hyp_nr_cpus) =3D num_possible_cpus(); + /* * Map the Hyp-code called directly from the host */ diff --git a/arch/arm64/kvm/hyp/include/nvhe/mem_protect.h b/arch/arm64/kvm= /hyp/include/nvhe/mem_protect.h index 5f9d56754e39..f8a7b8c04c49 100644 --- a/arch/arm64/kvm/hyp/include/nvhe/mem_protect.h +++ b/arch/arm64/kvm/hyp/include/nvhe/mem_protect.h @@ -30,8 +30,6 @@ enum pkvm_component_id { PKVM_ID_FFA, }; =20 -extern unsigned long hyp_nr_cpus; - int __pkvm_prot_finalize(void); int __pkvm_host_share_hyp(u64 pfn); int __pkvm_host_unshare_hyp(u64 pfn); diff --git a/arch/arm64/kvm/hyp/nvhe/hyp-main.c b/arch/arm64/kvm/hyp/nvhe/h= yp-main.c index 8ffbbce5e2ed..5559b622ea57 100644 --- a/arch/arm64/kvm/hyp/nvhe/hyp-main.c +++ b/arch/arm64/kvm/hyp/nvhe/hyp-main.c @@ -486,17 +486,15 @@ static void handle___pkvm_init(struct kvm_cpu_context= *host_ctxt) { DECLARE_REG(phys_addr_t, phys, host_ctxt, 1); DECLARE_REG(unsigned long, size, host_ctxt, 2); - DECLARE_REG(unsigned long, nr_cpus, host_ctxt, 3); - DECLARE_REG(unsigned long *, per_cpu_base, host_ctxt, 4); - DECLARE_REG(u32, hyp_va_bits, host_ctxt, 5); + DECLARE_REG(unsigned long *, per_cpu_base, host_ctxt, 3); + DECLARE_REG(u32, hyp_va_bits, host_ctxt, 4); =20 /* * __pkvm_init() will return only if an error occurred, otherwise it * will tail-call in __pkvm_init_finalise() which will have to deal * with the host context directly. */ - cpu_reg(host_ctxt, 1) =3D __pkvm_init(phys, size, nr_cpus, per_cpu_base, - hyp_va_bits); + cpu_reg(host_ctxt, 1) =3D __pkvm_init(phys, size, per_cpu_base, hyp_va_bi= ts); } =20 static void handle___pkvm_cpu_set_vector(struct kvm_cpu_context *host_ctxt) diff --git a/arch/arm64/kvm/hyp/nvhe/setup.c b/arch/arm64/kvm/hyp/nvhe/setu= p.c index 90bd014e952f..d8e5b563fd3d 100644 --- a/arch/arm64/kvm/hyp/nvhe/setup.c +++ b/arch/arm64/kvm/hyp/nvhe/setup.c @@ -341,8 +341,7 @@ void __noreturn __pkvm_init_finalise(void) __host_enter(host_ctxt); } =20 -int __pkvm_init(phys_addr_t phys, unsigned long size, unsigned long nr_cpu= s, - unsigned long *per_cpu_base, u32 hyp_va_bits) +int __pkvm_init(phys_addr_t phys, unsigned long size, unsigned long *per_c= pu_base, u32 hyp_va_bits) { struct kvm_nvhe_init_params *params; void *virt =3D hyp_phys_to_virt(phys); @@ -355,7 +354,6 @@ int __pkvm_init(phys_addr_t phys, unsigned long size, u= nsigned long nr_cpus, return -EINVAL; =20 hyp_spin_lock_init(&pkvm_pgd_lock); - hyp_nr_cpus =3D nr_cpus; =20 ret =3D divide_memory_pool(virt, size); if (ret) --=20 2.52.0.457.g6b5491de43-goog