From patchwork Tue Sep 3 11:34:18 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ani Sinha X-Patchwork-Id: 1979990 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=HZfNjisC; dkim-atps=neutral Authentication-Results: legolas.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=patchwork.ozlabs.org) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by legolas.ozlabs.org (Postfix) with ESMTPS id 4WykMr6yYKz1yZ9 for ; Tue, 3 Sep 2024 21:45:44 +1000 (AEST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1slRyP-00042a-LY; Tue, 03 Sep 2024 07:45:26 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1slRyD-0003i7-Fi for qemu-devel@nongnu.org; Tue, 03 Sep 2024 07:45:15 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1slRy3-0006IG-A4 for qemu-devel@nongnu.org; Tue, 03 Sep 2024 07:45:11 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1725363841; 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; bh=r0as5Ez9pDXfQjAecZyDf6B3cpNpbSgXo6vc2nKXViw=; b=HZfNjisC9uINCGfHtfBaSqunNmgebalF3Bg0v39z5olcsz+DhjEfWLNBteN2OwufbjtOwm ZWSa5A4Xk4cHGzTrRSSvkCgW56dBd653DE23QCJRvJkxmctVLBzH+P4oERJLYZyT8EknKZ CwaSpLEKNNVq6ad+ATmcdx6cjaoo79s= Received: from mail-oa1-f71.google.com (mail-oa1-f71.google.com [209.85.160.71]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-444-qm8KctWOM0uIT8S33oW6vg-1; Tue, 03 Sep 2024 07:34:38 -0400 X-MC-Unique: qm8KctWOM0uIT8S33oW6vg-1 Received: by mail-oa1-f71.google.com with SMTP id 586e51a60fabf-278249679a1so261397fac.3 for ; Tue, 03 Sep 2024 04:34:38 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1725363277; x=1725968077; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=r0as5Ez9pDXfQjAecZyDf6B3cpNpbSgXo6vc2nKXViw=; b=eff4feRqvKkGUbNPQNUc+9QlyV7ERh1tISXDYnVb90sbM54DFKAgddDTLnyl/dzWlD ulP0aOt8tMxSWPOfc9r5YRtIJSsMpWEZxobAYMT5xzCiy/VKXSlhdZAt0DpA+vbhMarj XcVTTFxX/y2SfAi0bufb9IBhqUPOi2L0cz8VM7mAbZkB2dgflhW4xzi3L3CAqzmVkBtH jsK3y3Z5PBeEKI7UyxFykjCYqLrB6O8rcOQbBULzEJ24rCHH12Rlwc8uMSHB+WGL8Hx5 0Q7y8TB9udY+gO557MbXohcO50aXTZrLhFiJWyx4uHfKOhuyRaztFbk69d7Czal577G8 hsvQ== X-Forwarded-Encrypted: i=1; AJvYcCW6cjnadx147i3ZokgviGR/6UDE1Hyp12qK5S8N1UM1uXwWlzvnhgpu3ipmryXmKu+Yt1/YTgIP2Pjl@nongnu.org X-Gm-Message-State: AOJu0YyD3iF3o/N3rCjhPd/VPVjbaNvN54NsG+mEzd8XmeVIbk/YV0bp FaQ3QzepQWDNqUdrb/3bIhUMj76rEh7BD4aQR8YK8A07OGyGdpwL2PAac2ksCLDTheXaqp4sZ+D 93vaVmEPHk9pcWwpHIz5Kdqn/YG3S3fkDBknRe5spbRg2zdkkMe1L X-Received: by 2002:a05:6871:7609:b0:277:fb54:5a5 with SMTP id 586e51a60fabf-277fb550429mr3919667fac.38.1725363277511; Tue, 03 Sep 2024 04:34:37 -0700 (PDT) X-Google-Smtp-Source: AGHT+IFaGWLyBSAnXCK3P78dLgV5cAuVSi6AUh0JT2oC6Wwy7fDVKNusUJIynBQX8YSzwj/2SyJyBA== X-Received: by 2002:a05:6871:7609:b0:277:fb54:5a5 with SMTP id 586e51a60fabf-277fb550429mr3919648fac.38.1725363277128; Tue, 03 Sep 2024 04:34:37 -0700 (PDT) Received: from localhost.localdomain ([115.96.207.26]) by smtp.googlemail.com with ESMTPSA id d2e1a72fcca58-715e569e746sm8565257b3a.97.2024.09.03.04.34.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 03 Sep 2024 04:34:36 -0700 (PDT) From: Ani Sinha To: Paolo Bonzini , Marcelo Tosatti Cc: Ani Sinha , kvm@vger.kernel.org, qemu-devel@nongnu.org Subject: [PATCH] kvm/i386: refactor kvm_arch_init and split it into smaller functions Date: Tue, 3 Sep 2024 17:04:18 +0530 Message-ID: <20240903113418.38475-1-anisinha@redhat.com> X-Mailer: git-send-email 2.42.0 MIME-Version: 1.0 Received-SPF: pass client-ip=170.10.129.124; envelope-from=anisinha@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=-0.142, 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_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=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+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org kvm_arch_init() enables a lot of vm capabilities. Refactor them into separate smaller functions. Energy MSR related operations also moved to its own function. There should be no functional impact. Signed-off-by: Ani Sinha --- target/i386/kvm/kvm.c | 337 ++++++++++++++++++++++++++---------------- 1 file changed, 211 insertions(+), 126 deletions(-) diff --git a/target/i386/kvm/kvm.c b/target/i386/kvm/kvm.c index 503e8d956e..574c62c21a 100644 --- a/target/i386/kvm/kvm.c +++ b/target/i386/kvm/kvm.c @@ -2997,10 +2997,197 @@ int kvm_arch_get_default_type(MachineState *ms) return 0; } +static int kvm_vm_enable_exception_payload(KVMState *s) +{ + int ret = 0; + has_exception_payload = kvm_check_extension(s, KVM_CAP_EXCEPTION_PAYLOAD); + if (has_exception_payload) { + ret = kvm_vm_enable_cap(s, KVM_CAP_EXCEPTION_PAYLOAD, 0, true); + if (ret < 0) { + error_report("kvm: Failed to enable exception payload cap: %s", + strerror(-ret)); + } + } + + return ret; +} + +static int kvm_vm_enable_triple_fault_event(KVMState *s) +{ + int ret = 0; + has_triple_fault_event = \ + kvm_check_extension(s, + KVM_CAP_X86_TRIPLE_FAULT_EVENT); + if (has_triple_fault_event) { + ret = kvm_vm_enable_cap(s, KVM_CAP_X86_TRIPLE_FAULT_EVENT, 0, true); + if (ret < 0) { + error_report("kvm: Failed to enable triple fault event cap: %s", + strerror(-ret)); + } + } + return ret; +} + +static int kvm_vm_set_identity_map_addr(KVMState *s, uint64_t *identity_base) +{ + /* + * On older Intel CPUs, KVM uses vm86 mode to emulate 16-bit code directly. + * In order to use vm86 mode, an EPT identity map and a TSS are needed. + * Since these must be part of guest physical memory, we need to allocate + * them, both by setting their start addresses in the kernel and by + * creating a corresponding e820 entry. We need 4 pages before the BIOS, + * so this value allows up to 16M BIOSes. + */ + *identity_base = 0xfeffc000; + return kvm_vm_ioctl(s, KVM_SET_IDENTITY_MAP_ADDR, identity_base); +} + +static int kvm_vm_set_nr_mmu_pages(KVMState *s) +{ + uint64_t shadow_mem; + int ret = 0; + shadow_mem = object_property_get_int(OBJECT(s), + "kvm-shadow-mem", + &error_abort); + if (shadow_mem != -1) { + shadow_mem /= 4096; + ret = kvm_vm_ioctl(s, KVM_SET_NR_MMU_PAGES, shadow_mem); + } + return ret; +} + +static int kvm_vm_set_tss_addr(KVMState *s, uint64_t identity_base) +{ + /* Set TSS base one page after EPT identity map. */ + return kvm_vm_ioctl(s, KVM_SET_TSS_ADDR, identity_base); +} + +static int kvm_vm_enable_disable_exits(KVMState *s) +{ + int disable_exits = kvm_check_extension(s, KVM_CAP_X86_DISABLE_EXITS); +/* Work around for kernel header with a typo. TODO: fix header and drop. */ +#if defined(KVM_X86_DISABLE_EXITS_HTL) && !defined(KVM_X86_DISABLE_EXITS_HLT) +#define KVM_X86_DISABLE_EXITS_HLT KVM_X86_DISABLE_EXITS_HTL +#endif + if (disable_exits) { + disable_exits &= (KVM_X86_DISABLE_EXITS_MWAIT | + KVM_X86_DISABLE_EXITS_HLT | + KVM_X86_DISABLE_EXITS_PAUSE | + KVM_X86_DISABLE_EXITS_CSTATE); + } + + return kvm_vm_enable_cap(s, KVM_CAP_X86_DISABLE_EXITS, 0, + disable_exits); +} + +static int kvm_vm_enable_bus_lock_exit(KVMState *s) +{ + int ret = 0; + ret = kvm_check_extension(s, KVM_CAP_X86_BUS_LOCK_EXIT); + if (!(ret & KVM_BUS_LOCK_DETECTION_EXIT)) { + error_report("kvm: bus lock detection unsupported"); + return -ENOTSUP; + } + ret = kvm_vm_enable_cap(s, KVM_CAP_X86_BUS_LOCK_EXIT, 0, + KVM_BUS_LOCK_DETECTION_EXIT); + if (ret < 0) { + error_report("kvm: Failed to enable bus lock detection cap: %s", + strerror(-ret)); + } + + return ret; +} + +static int kvm_vm_enable_notify_vmexit(KVMState *s) +{ + int ret = 0; + if (!kvm_check_extension(s, KVM_CAP_X86_NOTIFY_VMEXIT)) { + error_report("kvm: notify vmexit unsupported"); + return -ENOTSUP; + } + + if (s->notify_vmexit != NOTIFY_VMEXIT_OPTION_DISABLE) { + uint64_t notify_window_flags = + ((uint64_t)s->notify_window << 32) | + KVM_X86_NOTIFY_VMEXIT_ENABLED | + KVM_X86_NOTIFY_VMEXIT_USER; + ret = kvm_vm_enable_cap(s, KVM_CAP_X86_NOTIFY_VMEXIT, 0, + notify_window_flags); + if (ret < 0) { + error_report("kvm: Failed to enable notify vmexit cap: %s", + strerror(-ret)); + } + } + return ret; +} + +static int kvm_vm_enable_userspace_msr(KVMState *s) +{ + int ret; + + if (!kvm_vm_check_extension(s, KVM_CAP_X86_USER_SPACE_MSR)) { + error_report("kvm: userspace MSR not supported"); + return -ENOTSUP; + } + + ret = kvm_vm_enable_cap(s, KVM_CAP_X86_USER_SPACE_MSR, 0, + KVM_MSR_EXIT_REASON_FILTER); + if (ret < 0) { + error_report("Could not enable user space MSRs: %s", + strerror(-ret)); + exit(1); + } + + if (!kvm_filter_msr(s, MSR_CORE_THREAD_COUNT, + kvm_rdmsr_core_thread_count, NULL)) { + error_report("Could not install MSR_CORE_THREAD_COUNT handler!"); + exit(1); + } + + return 0; +} + +static void kvm_vm_enable_energy_msrs(KVMState *s) +{ + bool r; + if (s->msr_energy.enable == true) { + r = kvm_filter_msr(s, MSR_RAPL_POWER_UNIT, + kvm_rdmsr_rapl_power_unit, NULL); + if (!r) { + error_report("Could not install MSR_RAPL_POWER_UNIT \ + handler"); + exit(1); + } + + r = kvm_filter_msr(s, MSR_PKG_POWER_LIMIT, + kvm_rdmsr_pkg_power_limit, NULL); + if (!r) { + error_report("Could not install MSR_PKG_POWER_LIMIT \ + handler"); + exit(1); + } + + r = kvm_filter_msr(s, MSR_PKG_POWER_INFO, + kvm_rdmsr_pkg_power_info, NULL); + if (!r) { + error_report("Could not install MSR_PKG_POWER_INFO \ + handler"); + exit(1); + } + r = kvm_filter_msr(s, MSR_PKG_ENERGY_STATUS, + kvm_rdmsr_pkg_energy_status, NULL); + if (!r) { + error_report("Could not install MSR_PKG_ENERGY_STATUS \ + handler"); + exit(1); + } + } + return; +} + int kvm_arch_init(MachineState *ms, KVMState *s) { uint64_t identity_base = 0xfffbc000; - uint64_t shadow_mem; int ret; struct utsname utsname; Error *local_err = NULL; @@ -3030,24 +3217,14 @@ int kvm_arch_init(MachineState *ms, KVMState *s) hv_vpindex_settable = kvm_check_extension(s, KVM_CAP_HYPERV_VP_INDEX); - has_exception_payload = kvm_check_extension(s, KVM_CAP_EXCEPTION_PAYLOAD); - if (has_exception_payload) { - ret = kvm_vm_enable_cap(s, KVM_CAP_EXCEPTION_PAYLOAD, 0, true); - if (ret < 0) { - error_report("kvm: Failed to enable exception payload cap: %s", - strerror(-ret)); - return ret; - } + ret = kvm_vm_enable_exception_payload(s); + if (ret < 0) { + return ret; } - has_triple_fault_event = kvm_check_extension(s, KVM_CAP_X86_TRIPLE_FAULT_EVENT); - if (has_triple_fault_event) { - ret = kvm_vm_enable_cap(s, KVM_CAP_X86_TRIPLE_FAULT_EVENT, 0, true); - if (ret < 0) { - error_report("kvm: Failed to enable triple fault event cap: %s", - strerror(-ret)); - return ret; - } + ret = kvm_vm_enable_triple_fault_event(s); + if (ret < 0) { + return ret; } if (s->xen_version) { @@ -3078,22 +3255,12 @@ int kvm_arch_init(MachineState *ms, KVMState *s) uname(&utsname); lm_capable_kernel = strcmp(utsname.machine, "x86_64") == 0; - /* - * On older Intel CPUs, KVM uses vm86 mode to emulate 16-bit code directly. - * In order to use vm86 mode, an EPT identity map and a TSS are needed. - * Since these must be part of guest physical memory, we need to allocate - * them, both by setting their start addresses in the kernel and by - * creating a corresponding e820 entry. We need 4 pages before the BIOS, - * so this value allows up to 16M BIOSes. - */ - identity_base = 0xfeffc000; - ret = kvm_vm_ioctl(s, KVM_SET_IDENTITY_MAP_ADDR, &identity_base); + ret = kvm_vm_set_identity_map_addr(s, &identity_base); if (ret < 0) { return ret; } - /* Set TSS base one page after EPT identity map. */ - ret = kvm_vm_ioctl(s, KVM_SET_TSS_ADDR, identity_base + 0x1000); + ret = kvm_vm_set_tss_addr(s, identity_base + 0x1000); if (ret < 0) { return ret; } @@ -3101,13 +3268,9 @@ int kvm_arch_init(MachineState *ms, KVMState *s) /* Tell fw_cfg to notify the BIOS to reserve the range. */ e820_add_entry(identity_base, 0x4000, E820_RESERVED); - shadow_mem = object_property_get_int(OBJECT(s), "kvm-shadow-mem", &error_abort); - if (shadow_mem != -1) { - shadow_mem /= 4096; - ret = kvm_vm_ioctl(s, KVM_SET_NR_MMU_PAGES, shadow_mem); - if (ret < 0) { - return ret; - } + ret = kvm_vm_set_nr_mmu_pages(s); + if (ret < 0) { + return ret; } if (kvm_check_extension(s, KVM_CAP_X86_SMM) && @@ -3118,20 +3281,7 @@ int kvm_arch_init(MachineState *ms, KVMState *s) } if (enable_cpu_pm) { - int disable_exits = kvm_check_extension(s, KVM_CAP_X86_DISABLE_EXITS); -/* Work around for kernel header with a typo. TODO: fix header and drop. */ -#if defined(KVM_X86_DISABLE_EXITS_HTL) && !defined(KVM_X86_DISABLE_EXITS_HLT) -#define KVM_X86_DISABLE_EXITS_HLT KVM_X86_DISABLE_EXITS_HTL -#endif - if (disable_exits) { - disable_exits &= (KVM_X86_DISABLE_EXITS_MWAIT | - KVM_X86_DISABLE_EXITS_HLT | - KVM_X86_DISABLE_EXITS_PAUSE | - KVM_X86_DISABLE_EXITS_CSTATE); - } - - ret = kvm_vm_enable_cap(s, KVM_CAP_X86_DISABLE_EXITS, 0, - disable_exits); + ret = kvm_vm_enable_disable_exits(s); if (ret < 0) { error_report("kvm: guest stopping CPU not supported: %s", strerror(-ret)); @@ -3142,16 +3292,8 @@ int kvm_arch_init(MachineState *ms, KVMState *s) X86MachineState *x86ms = X86_MACHINE(ms); if (x86ms->bus_lock_ratelimit > 0) { - ret = kvm_check_extension(s, KVM_CAP_X86_BUS_LOCK_EXIT); - if (!(ret & KVM_BUS_LOCK_DETECTION_EXIT)) { - error_report("kvm: bus lock detection unsupported"); - return -ENOTSUP; - } - ret = kvm_vm_enable_cap(s, KVM_CAP_X86_BUS_LOCK_EXIT, 0, - KVM_BUS_LOCK_DETECTION_EXIT); + ret = kvm_vm_enable_bus_lock_exit(s); if (ret < 0) { - error_report("kvm: Failed to enable bus lock detection cap: %s", - strerror(-ret)); return ret; } ratelimit_init(&bus_lock_ratelimit_ctrl); @@ -3160,80 +3302,23 @@ int kvm_arch_init(MachineState *ms, KVMState *s) } } - if (s->notify_vmexit != NOTIFY_VMEXIT_OPTION_DISABLE && - kvm_check_extension(s, KVM_CAP_X86_NOTIFY_VMEXIT)) { - uint64_t notify_window_flags = - ((uint64_t)s->notify_window << 32) | - KVM_X86_NOTIFY_VMEXIT_ENABLED | - KVM_X86_NOTIFY_VMEXIT_USER; - ret = kvm_vm_enable_cap(s, KVM_CAP_X86_NOTIFY_VMEXIT, 0, - notify_window_flags); - if (ret < 0) { - error_report("kvm: Failed to enable notify vmexit cap: %s", - strerror(-ret)); - return ret; - } + ret = kvm_vm_enable_notify_vmexit(s); + if (ret < 0) { + return ret; } - if (kvm_vm_check_extension(s, KVM_CAP_X86_USER_SPACE_MSR)) { - bool r; - ret = kvm_vm_enable_cap(s, KVM_CAP_X86_USER_SPACE_MSR, 0, - KVM_MSR_EXIT_REASON_FILTER); - if (ret) { - error_report("Could not enable user space MSRs: %s", - strerror(-ret)); - exit(1); - } - - r = kvm_filter_msr(s, MSR_CORE_THREAD_COUNT, - kvm_rdmsr_core_thread_count, NULL); - if (!r) { - error_report("Could not install MSR_CORE_THREAD_COUNT handler: %s", - strerror(-ret)); - exit(1); + if (kvm_vm_check_extension(s, KVM_CAP_X86_USER_SPACE_MSR)) { + ret = kvm_vm_enable_userspace_msr(s); + if (ret < 0) { + return ret; } if (s->msr_energy.enable == true) { - r = kvm_filter_msr(s, MSR_RAPL_POWER_UNIT, - kvm_rdmsr_rapl_power_unit, NULL); - if (!r) { - error_report("Could not install MSR_RAPL_POWER_UNIT \ - handler: %s", - strerror(-ret)); - exit(1); - } - - r = kvm_filter_msr(s, MSR_PKG_POWER_LIMIT, - kvm_rdmsr_pkg_power_limit, NULL); - if (!r) { - error_report("Could not install MSR_PKG_POWER_LIMIT \ - handler: %s", - strerror(-ret)); - exit(1); - } - - r = kvm_filter_msr(s, MSR_PKG_POWER_INFO, - kvm_rdmsr_pkg_power_info, NULL); - if (!r) { - error_report("Could not install MSR_PKG_POWER_INFO \ - handler: %s", - strerror(-ret)); + kvm_vm_enable_energy_msrs(s); + if (kvm_msr_energy_thread_init(s, ms)) { + error_report("kvm : error RAPL feature requirement not met"); exit(1); } - r = kvm_filter_msr(s, MSR_PKG_ENERGY_STATUS, - kvm_rdmsr_pkg_energy_status, NULL); - if (!r) { - error_report("Could not install MSR_PKG_ENERGY_STATUS \ - handler: %s", - strerror(-ret)); - exit(1); - } - r = kvm_msr_energy_thread_init(s, ms); - if (r) { - error_report("kvm : error RAPL feature requirement not meet"); - exit(1); - } - } }