From patchwork Fri Mar 1 10:17:13 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gerd Hoffmann X-Patchwork-Id: 13578284 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C5B296A325 for ; Fri, 1 Mar 2024 10:17:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709288241; cv=none; b=u9LeV2aZlamUv4/1AHa7EY0eWfZIHrGLRO2YI5Kzu+KTcJLwNXF+ZMnRvRkArKKPA9yjiMXA5mcV1GgPwUKWZzy7ADR+BUIJ8TOA91ajPy6LVVVWjYCK5VDJtjJqff6lArifhig3Lh234bYuZlbnv1yau3VZL44hzKjc4GEB56g= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709288241; c=relaxed/simple; bh=Q5N5VgbHX3TyzlddZsaRmdtq+vL9Es8FKg6tBnOdhao=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=l2fe4+vpoCB/P4bFtXaSnK1AmNC045WAHogm1MnF0GaUuV/RreiGeKRkdnYLwWWfmhZn4JwOoh91vIlErtKhEj3ukh9I+WC+W5oKwYj3qzg6VFggcBsScQHTwIYUzy3h8C/YoNvRvhMtxnpz/Dtxti72lFLc2mjKduWK8Qz30L8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=DWA1XQes; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="DWA1XQes" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1709288238; 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=DWA1XQes43zqy8U4WOESvsHeng9GLZEeEjZ2dAJbjhAntQN1K2snUsSd8ZrMdckoViYx01 7l6/+rkWUXjVdJpcghWjGfphCcLwTH7qK54yi6U46PCDoQNtO9pgs5JCNVOOWjtd5UcxyW Yepv2fKv14YW+dMkDpowS6pUgbrF7Lg= Received: from mimecast-mx02.redhat.com (mx-ext.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-619-0LGv2Pw8Pa683wrQIr3ktg-1; Fri, 01 Mar 2024 05:17:15 -0500 X-MC-Unique: 0LGv2Pw8Pa683wrQIr3ktg-1 Received: from smtp.corp.redhat.com (int-mx10.intmail.prod.int.rdu2.redhat.com [10.11.54.10]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 57E6728EC113; Fri, 1 Mar 2024 10:17:15 +0000 (UTC) Received: from sirius.home.kraxel.org (unknown [10.39.192.121]) by smtp.corp.redhat.com (Postfix) with ESMTPS id F0073492BE2; Fri, 1 Mar 2024 10:17:14 +0000 (UTC) Received: by sirius.home.kraxel.org (Postfix, from userid 1000) id 0B6E3180148E; Fri, 1 Mar 2024 11:17:14 +0100 (CET) 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> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.10 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 { /* Number of physical address bits supported */ uint32_t phys_bits; + uint32_t guest_phys_bits; /* 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 |= (cpu_x86_virtual_addr_width(env) << 8); + *eax |= (cpu->guest_phys_bits << 16); } *ebx = 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 = X86_CPU(cs); CPUX86State *env = &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) env->apic_bus_freq = KVM_APIC_BUS_FREQUENCY; + guest_phys_bits = kvm_check_extension(cs->kvm_state, KVM_CAP_VM_GPA_BITS); + if (guest_phys_bits && + (cpu->guest_phys_bits == 0 || + cpu->guest_phys_bits > guest_phys_bits)) { + cpu->guest_phys_bits = 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