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s=mimecast20190719; t=1709288237; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=L4tloGzTclE01aZgDWKwhvpvN6goYAyVoicNQ/4Whak=; b=V/EAFozpYAFDbrIi9j/umUSx5OL6wK+rcwYquGYoH1JXC2Cae5uxymWPpvNXmUboBmwGdj WB+YBrQbLhi899UQh2eynGSdOBUWp4v7ujvUSYuS5YYhBRe/J5KjSZAU7vwVYnfaJV/Mkj WNw1RIgjvP0u2IfGu9E0GQ4D4qNI9s4= X-MC-Unique: 0LGv2Pw8Pa683wrQIr3ktg-1 From: Gerd Hoffmann To: qemu-devel@nongnu.org Cc: Marcelo Tosatti , Paolo Bonzini , kvm@vger.kernel.org, Gerd Hoffmann Subject: [PATCH 1/1] kvm: add support for guest physical bits Date: Fri, 1 Mar 2024 11:17:13 +0100 Message-ID: <20240301101713.356759-2-kraxel@redhat.com> In-Reply-To: <20240301101713.356759-1-kraxel@redhat.com> References: <20240301101713.356759-1-kraxel@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.10 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.129.124; envelope-from=kraxel@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -21 X-Spam_score: -2.2 X-Spam_bar: -- X-Spam_report: (-2.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.096, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1709288291681100002 Content-Type: text/plain; charset="utf-8" query kvm for supported guest physical address bits using KVM_CAP_VM_GPA_BITS. Expose the value to the guest via cpuid (leaf 0x80000008, eax, bits 16-23). Signed-off-by: Gerd Hoffmann --- target/i386/cpu.h | 1 + target/i386/cpu.c | 1 + target/i386/kvm/kvm.c | 8 ++++++++ 3 files changed, 10 insertions(+) diff --git a/target/i386/cpu.h b/target/i386/cpu.h index 952174bb6f52..d427218827f6 100644 --- a/target/i386/cpu.h +++ b/target/i386/cpu.h @@ -2026,6 +2026,7 @@ struct ArchCPU { =20 /* Number of physical address bits supported */ uint32_t phys_bits; + uint32_t guest_phys_bits; =20 /* in order to simplify APIC support, we leave this pointer to the user */ diff --git a/target/i386/cpu.c b/target/i386/cpu.c index 2666ef380891..1a6cfc75951e 100644 --- a/target/i386/cpu.c +++ b/target/i386/cpu.c @@ -6570,6 +6570,7 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, = uint32_t count, if (env->features[FEAT_8000_0001_EDX] & CPUID_EXT2_LM) { /* 64 bit processor */ *eax |=3D (cpu_x86_virtual_addr_width(env) << 8); + *eax |=3D (cpu->guest_phys_bits << 16); } *ebx =3D env->features[FEAT_8000_0008_EBX]; if (cs->nr_cores * cs->nr_threads > 1) { diff --git a/target/i386/kvm/kvm.c b/target/i386/kvm/kvm.c index 42970ab046fa..e06c9d66bb01 100644 --- a/target/i386/kvm/kvm.c +++ b/target/i386/kvm/kvm.c @@ -1716,6 +1716,7 @@ int kvm_arch_init_vcpu(CPUState *cs) X86CPU *cpu =3D X86_CPU(cs); CPUX86State *env =3D &cpu->env; uint32_t limit, i, j, cpuid_i; + uint32_t guest_phys_bits; uint32_t unused; struct kvm_cpuid_entry2 *c; uint32_t signature[3]; @@ -1751,6 +1752,13 @@ int kvm_arch_init_vcpu(CPUState *cs) =20 env->apic_bus_freq =3D KVM_APIC_BUS_FREQUENCY; =20 + guest_phys_bits =3D kvm_check_extension(cs->kvm_state, KVM_CAP_VM_GPA_= BITS); + if (guest_phys_bits && + (cpu->guest_phys_bits =3D=3D 0 || + cpu->guest_phys_bits > guest_phys_bits)) { + cpu->guest_phys_bits =3D guest_phys_bits; + } + /* * kvm_hyperv_expand_features() is called here for the second time in = case * KVM_CAP_SYS_HYPERV_CPUID is not supported. While we can't possibly = handle --=20 2.44.0