From nobody Sun Feb 8 17:42:55 2026 Received: from mail-wm1-f74.google.com (mail-wm1-f74.google.com [209.85.128.74]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E3E4176415 for ; Tue, 20 Feb 2024 15:11:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.74 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708441909; cv=none; b=rsYbg5IQPaqzKDcw3b/NXH5/sGanjySuM2mawQyHnKS3I8oAhM6AR9qW8b1OvoMTgVn/aUgCLhg3Lku7CizYJzuuJYwuI0sRp/0hDq2xiW0kDI3yGCylb+j8IcWVO2zqL9wnAj7E5eAmjXFLvnwdE7MthzPKZcijOFLJjKkCWvI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708441909; c=relaxed/simple; bh=iAbfp5RMm6S0VsTLeL0qLihHKZbBLamOM0a8x66sOYk=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=qe6wi1L7P14TOowR6ZHzfYQFBE1uN6ixvAblIoTDhH7nh48lQaFivwhytnCMk0dtvUYuziQZ4GTE4s8tDcwDY93RXVpj87Jkm81VlBziWD6F5GaLHzZtMZFwePXpxN+4lCh5Bp6bJs5S53QC312ggDtspky04tHnvW1EGcEaeNo= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--sebastianene.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=SeB/23qB; arc=none smtp.client-ip=209.85.128.74 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--sebastianene.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="SeB/23qB" Received: by mail-wm1-f74.google.com with SMTP id 5b1f17b1804b1-40f01cf71ceso32331395e9.1 for ; Tue, 20 Feb 2024 07:11:47 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1708441906; x=1709046706; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=H7oP8Hepk3ownDnPLORI/cfTnoWlrJNhVmX40NRmmOs=; b=SeB/23qBiLQHIBwyrSbXj4AWgF3imIC5u4XC3L4VZjuNXwlzggVXLl0n9FvmRH0ALC WJpeQIfqU45qhciXLALfD7O8mwOkM2mQygj1QrTTYNQTtKt6XUSI6tVeocrCZCmMVj4m 1LhJDDTxL+KMmkIG/ndedDTfMdWUuKwgPu15M7ovN/7RPpgXeBwbw8DtoQ7B6ILA7BZE pym8pIgq+9sQKJJK6Dy3A0BMd2vZaHcO+OsOcGRRu+tDuQNmicsHT+wF06hE93UYIi94 irlp7VjGU5l10dAvKXrkA6+JWO2qOlIrEHc0fJgR2DqPOAjF1n0ojaLuwI+Lls5Uiot2 nHzQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1708441906; x=1709046706; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=H7oP8Hepk3ownDnPLORI/cfTnoWlrJNhVmX40NRmmOs=; b=v+IVTmH03VPMLZLsSQLI8/Yyw2V7KRqQ1i92wTBdBonuiBPR35YDj1MiB40jp0yQEk uq8H6/kn6wXHVQqvbDOn/60N95Yu8ANwEgLSLA8RPNpgxhiMeyiblbCdg5/jhZifU1zj ZSm/vUnHWJ2Zj1EsbusBOCNEgFiP25hgRVOSQ1saY+x/taAruLjtWooYoixLiT41qHN8 XILxGwW+Tm//D073SasfZtLGt4L5GRHD+d01/gtw34Yr39CpKD09Qg8IwAD9DHDisOKG n9CWjqV+//S4ajr/bDfR/NplktoRcNbIpiIfgAP/LilBi+Ann1Uq2eDNrMCrhfkBmYFb wwAw== X-Forwarded-Encrypted: i=1; AJvYcCUXQEHhgqJGvHFeO8fw83M4lGOeNWm4zZylUfBbvei6YdmrbcBrz5X1gfcgrreco4hjgu2AM4NPiob4JJZDKz92PZgISvDN+imHHmNx X-Gm-Message-State: AOJu0YwNYNiU2+okfiJkz+JBqNfZt1ikt53UjAZoEUGlimDqOhsQ7tSw Z88VEq+ZRI1ufxNd2TuH/vpuuMAXIF4NU6tk7Yyb+Vg8H75tsS7UDHJkVIQVLDpNH3YXokxEXWj +c0JzDxE1LUQCDL6HNcyfPkpgeA== X-Google-Smtp-Source: AGHT+IGB7BTGnDb3ZkCnAAs2rfcGHOBnu1LEeWRHD3gtXF/mQBI/OcbxgBVpxOTVwd/bVPF2OExz8lYc9i55R+XvxE0= X-Received: from sebkvm.c.googlers.com ([fda3:e722:ac3:cc00:28:9cb1:c0a8:cd5]) (user=sebastianene job=sendgmr) by 2002:a05:600c:a:b0:411:ea5e:6142 with SMTP id g10-20020a05600c000a00b00411ea5e6142mr115684wmc.2.1708441906396; Tue, 20 Feb 2024 07:11:46 -0800 (PST) Date: Tue, 20 Feb 2024 15:10:35 +0000 In-Reply-To: <20240220151035.327199-1-sebastianene@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20240220151035.327199-1-sebastianene@google.com> X-Mailer: git-send-email 2.44.0.rc0.258.g7320e95886-goog Message-ID: <20240220151035.327199-7-sebastianene@google.com> Subject: [PATCH v6 6/6] KVM: arm64: Expose guest stage-2 pagetable config to debugfs From: Sebastian Ene To: catalin.marinas@arm.com, gshan@redhat.com, james.morse@arm.com, mark.rutland@arm.com, maz@kernel.org, oliver.upton@linux.dev, rananta@google.com, ricarkol@google.com, ryan.roberts@arm.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, vdonnefort@google.com, Sebastian Ene 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 | 50 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 50 insertions(+) diff --git a/arch/arm64/kvm/ptdump.c b/arch/arm64/kvm/ptdump.c index 2c4e0c122d23..a68a22592e97 100644 --- a/arch/arm64/kvm/ptdump.c +++ b/arch/arm64/kvm/ptdump.c @@ -213,8 +213,58 @@ 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 *) +{ + 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", pgtable->start_level); + return 0; +} + +static int kvm_pgtable_debugfs_open(struct inode *m, struct file *file) +{ + struct kvm *kvm =3D m->i_private; + struct kvm_s2_mmu *mmu; + struct kvm_pgtable *pgtable; + int ret; + + if (!kvm_get_kvm_safe(kvm)) + return -ENOENT; + + mmu =3D &kvm->arch.mmu; + pgtable =3D 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 2.44.0.rc0.258.g7320e95886-goog