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AJvYcCVuEa8gJrTeUaflB7ZhkOhnqcIELa22953BWGrbD+52FP2OBolB2s2L1BMBDoGrZ+MKPUizycvTvBJoeSzPhuekC+c/LjdrfrbAOjos X-Gm-Message-State: AOJu0YxEAzLpFZt4it/vjFEGVuq1aOjHM7rU2g0rfuQrMDVCfsWLd4lj t+FZvkjtR9i3d2sjA6YHFgqpBIMN4Zt0EHO5uAjUdoXeIA9XsHme+eHlElVjOEDjE6Q1Pz6x7R7 rtCRElsXka7Gbo9lLQDQAo9IsVg== X-Google-Smtp-Source: AGHT+IFGgP1UpKc1nFsMN2cnAW/WNRr3YojR2uI15QJjFmnongfC+MYnDiKQo3s4RWZo8/KjRQyeYn/x04TBgYlZR34= X-Received: from sebkvm.c.googlers.com ([fda3:e722:ac3:cc00:28:9cb1:c0a8:cd5]) (user=sebastianene job=sendgmr) by 2002:a05:6000:1e81:b0:366:ea7c:bed1 with SMTP id ffacd0b85a97d-371943164fbmr3636f8f.1.1723811968492; Fri, 16 Aug 2024 05:39:28 -0700 (PDT) Date: Fri, 16 Aug 2024 12:39:06 +0000 In-Reply-To: <20240816123906.3683425-1-sebastianene@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20240816123906.3683425-1-sebastianene@google.com> X-Mailer: git-send-email 2.46.0.184.g6999bdac58-goog Message-ID: <20240816123906.3683425-7-sebastianene@google.com> Subject: [PATCH v8 6/6] KVM: arm64: Expose guest stage-2 pagetable config to debugfs From: Sebastian Ene To: akpm@linux-foundation.org, alexghiti@rivosinc.com, ankita@nvidia.com, ardb@kernel.org, catalin.marinas@arm.com, christophe.leroy@csgroup.eu, james.morse@arm.com, vdonnefort@google.com, mark.rutland@arm.com, maz@kernel.org, oliver.upton@linux.dev, rananta@google.com, ryan.roberts@arm.com, sebastianene@google.com, shahuang@redhat.com, suzuki.poulose@arm.com, will@kernel.org, yuzenghui@huawei.com Cc: kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, kernel-team@android.com Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Make the start level and the IPA bits properties available in the virtual machine debugfs directory. Make sure that the KVM structure doesn't disappear behind our back and keep a reference to the KVM struct while these files are opened. Signed-off-by: Sebastian Ene --- arch/arm64/kvm/ptdump.c | 48 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 48 insertions(+) diff --git a/arch/arm64/kvm/ptdump.c b/arch/arm64/kvm/ptdump.c index 79be07ec3c3c..b0d55ea3fb2a 100644 --- a/arch/arm64/kvm/ptdump.c +++ b/arch/arm64/kvm/ptdump.c @@ -207,8 +207,56 @@ static const struct file_operations kvm_ptdump_guest_f= ops =3D { .release =3D kvm_ptdump_guest_close, }; =20 +static int kvm_pgtable_debugfs_show(struct seq_file *m, void *unused) +{ + const struct file *file =3D m->file; + struct kvm_pgtable *pgtable =3D m->private; + + if (!strcmp(file_dentry(file)->d_iname, "ipa_range")) + seq_printf(m, "%2u\n", pgtable->ia_bits); + else if (!strcmp(file_dentry(file)->d_iname, "stage2_levels")) + seq_printf(m, "%1d\n", KVM_PGTABLE_LAST_LEVEL - pgtable->start_level + 1= ); + return 0; +} + +static int kvm_pgtable_debugfs_open(struct inode *m, struct file *file) +{ + struct kvm *kvm =3D m->i_private; + struct kvm_pgtable *pgtable; + int ret; + + if (!kvm_get_kvm_safe(kvm)) + return -ENOENT; + + pgtable =3D kvm->arch.mmu.pgt; + + ret =3D single_open(file, kvm_pgtable_debugfs_show, pgtable); + if (ret < 0) + kvm_put_kvm(kvm); + return ret; +} + +static int kvm_pgtable_debugfs_close(struct inode *m, struct file *file) +{ + struct kvm *kvm =3D m->i_private; + + kvm_put_kvm(kvm); + return single_release(m, file); +} + +static const struct file_operations kvm_pgtable_debugfs_fops =3D { + .open =3D kvm_pgtable_debugfs_open, + .read =3D seq_read, + .llseek =3D seq_lseek, + .release =3D kvm_pgtable_debugfs_close, +}; + void kvm_ptdump_guest_register(struct kvm *kvm) { debugfs_create_file("stage2_page_tables", 0400, kvm->debugfs_dentry, kvm, &kvm_ptdump_guest_fops); + debugfs_create_file("ipa_range", 0400, kvm->debugfs_dentry, kvm, + &kvm_pgtable_debugfs_fops); + debugfs_create_file("stage2_levels", 0400, kvm->debugfs_dentry, + kvm, &kvm_pgtable_debugfs_fops); } --=20 2.46.0.184.g6999bdac58-goog