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Sun, 02 Mar 2025 20:48:53 -0800 (PST) X-Google-Smtp-Source: AGHT+IF0bFqBHp5vrV5kno/u9pdc5LbTz/krk4wxyP++znTwdfie+ZMz0iB8kF9GwoMI70Qf1wWKBg== X-Received: by 2002:a17:90b:3e84:b0:2ee:8031:cdbc with SMTP id 98e67ed59e1d1-2febac046a6mr14181169a91.23.1740977333178; Sun, 02 Mar 2025 20:48:53 -0800 (PST) Received: from [192.168.68.55] ([180.233.125.164]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2235050d7c1sm68704355ad.198.2025.03.02.20.48.46 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 02 Mar 2025 20:48:52 -0800 (PST) Message-ID: Date: Mon, 3 Mar 2025 14:48:44 +1000 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v7 09/45] kvm: arm64: Expose debug HW register numbers for Realm To: Steven Price , kvm@vger.kernel.org, kvmarm@lists.linux.dev Cc: Suzuki K Poulose , Catalin Marinas , Marc Zyngier , Will Deacon , James Morse , Oliver Upton , Zenghui Yu , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Joey Gouly , Alexandru Elisei , Christoffer Dall , Fuad Tabba , linux-coco@lists.linux.dev, Ganapatrao Kulkarni , Shanker Donthineni , Alper Gun , "Aneesh Kumar K . V" References: <20250213161426.102987-1-steven.price@arm.com> <20250213161426.102987-10-steven.price@arm.com> Content-Language: en-US From: Gavin Shan In-Reply-To: <20250213161426.102987-10-steven.price@arm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 2/14/25 2:13 AM, Steven Price wrote: > From: Suzuki K Poulose > > Expose VM specific Debug HW register numbers. > > Signed-off-by: Suzuki K Poulose > Signed-off-by: Steven Price > --- > arch/arm64/kvm/arm.c | 24 +++++++++++++++++++++--- > 1 file changed, 21 insertions(+), 3 deletions(-) > Documentation/virt/kvm/api.rst needs to be updated accordingly. > diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c > index b8fa82be251c..df6eb5e9ca96 100644 > --- a/arch/arm64/kvm/arm.c > +++ b/arch/arm64/kvm/arm.c > @@ -78,6 +78,22 @@ bool is_kvm_arm_initialised(void) > return kvm_arm_initialised; > } > > +static u32 kvm_arm_get_num_brps(struct kvm *kvm) > +{ > + if (!kvm_is_realm(kvm)) > + return get_num_brps(); > + /* Realm guest is not debuggable. */ > + return 0; > +} > + > +static u32 kvm_arm_get_num_wrps(struct kvm *kvm) > +{ > + if (!kvm_is_realm(kvm)) > + return get_num_wrps(); > + /* Realm guest is not debuggable. */ > + return 0; > +} > + The above two comments "Realm guest is not debuggable." can be dropped since the code is self-explanatory, and those two functions are unnecessary to be kept in that way, for example: case KVM_CAP_GUEST_DEBUG_HW_BPS: return kvm_is_realm(kvm) ? 0 : get_num_brps(); case KVM_CAP_GUEST_DEBUG_HW_WRPS: return kvm_is_realm(kvm) ? 0 : get_num_wrps(); > int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu) > { > return kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE; > @@ -323,7 +339,6 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) > case KVM_CAP_ARM_IRQ_LINE_LAYOUT_2: > case KVM_CAP_ARM_NISV_TO_USER: > case KVM_CAP_ARM_INJECT_EXT_DABT: > - case KVM_CAP_SET_GUEST_DEBUG: > case KVM_CAP_VCPU_ATTRIBUTES: > case KVM_CAP_PTP_KVM: > case KVM_CAP_ARM_SYSTEM_SUSPEND: > @@ -331,6 +346,9 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) > case KVM_CAP_COUNTER_OFFSET: > r = 1; > break; > + case KVM_CAP_SET_GUEST_DEBUG: > + r = !kvm_is_realm(kvm); > + break; > case KVM_CAP_SET_GUEST_DEBUG2: > return KVM_GUESTDBG_VALID_MASK; > case KVM_CAP_ARM_SET_DEVICE_ADDR: > @@ -376,10 +394,10 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) > r = cpus_have_final_cap(ARM64_HAS_32BIT_EL1); > break; > case KVM_CAP_GUEST_DEBUG_HW_BPS: > - r = get_num_brps(); > + r = kvm_arm_get_num_brps(kvm); > break; > case KVM_CAP_GUEST_DEBUG_HW_WPS: > - r = get_num_wrps(); > + r = kvm_arm_get_num_wrps(kvm); > break; > case KVM_CAP_ARM_PMU_V3: > r = kvm_arm_support_pmu_v3(); Thanks, Gavin