From patchwork Wed Oct 31 13:26:32 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Marc Orr X-Patchwork-Id: 10662677 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id EE47013BF for ; Wed, 31 Oct 2018 13:26:47 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id DC034284BD for ; Wed, 31 Oct 2018 13:26:47 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id CFC4928AA4; Wed, 31 Oct 2018 13:26:47 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.5 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI, USER_IN_DEF_DKIM_WL autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 0966C284BD for ; Wed, 31 Oct 2018 13:26:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729204AbeJaWYr (ORCPT ); Wed, 31 Oct 2018 18:24:47 -0400 Received: from mail-qk1-f202.google.com ([209.85.222.202]:43831 "EHLO mail-qk1-f202.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729100AbeJaWYq (ORCPT ); Wed, 31 Oct 2018 18:24:46 -0400 Received: by mail-qk1-f202.google.com with SMTP id z126so242934qka.10 for ; Wed, 31 Oct 2018 06:26:44 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=uuP0VVlUnqXp2dMHDoSAgZr4dF/qtgdpqgl8mRbBnkk=; b=F+NB1RxcQr2bTutSgJwdifRc4zUjLOl3TxTiJHutBqkRq9urjO1g/Ejfoj2m02VRRi mXa/kOSHDf/1S4KttEeQI3hW+yIRaWyYJPtEj/dd2aj7aAHrB26s2t7pkMRg48EnSci0 yqIfk90njcXNVQY1uiKJ68GfDVT5xiWF7pkMfgPTBRoaVTKiWJAhUyl1WlU2wL4toIIn JFjJ/iE4dnPv3Bx0Mt9D7bq70PkLz+bIg3jOY7BsGE/V5dK0Mv+LNlqAJSNn9tKRCUBF HaD5EDUQolCbdGjcBOeO52uO4hdoud3797xftSYdWIOQeDEFhmro/vIcS3OEMiXdi2eP 8F5A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=uuP0VVlUnqXp2dMHDoSAgZr4dF/qtgdpqgl8mRbBnkk=; b=neTh9XbToWkEGegiT304uZOCHvcC5DphManHef6R+H8aqCWahTsUScxQCfDrmyj6XW rkSwIPQGAPDZnWGV4GZNAHhU2vQpHQDbXrZHDOhDzJGNe9uqMI3ThTLBnA7HZm2E+Ged Gj3TYP6iRVRLXbGyIPl5I8BS8ekrQ6rzDN5zmF/iJtb8P7s8ReTUECxLapZAc9RomyHQ fu3VQipUsWCwa9Zmr4kKsQLi1A9Ywtng70Yx/BJ4XPRZ+S9mUPix2ZRyNi6/V80aAaOI NUmlrbjo8YZhSr7DW+D7t536sGENNMkTco/9ZTQvLvIPXvhXr1a3cvu1hzzJZjUX+0bz ugQg== X-Gm-Message-State: AGRZ1gKWvvyjWWKdQaxIDkb6Jy40iYUC0HT8yaaTIs65Dq1NE0n1LORf czq59eF59SsfIgbwUHs8maiGhv18TTVlcTME86Y2XY2dv6TlAIgUumT+0WgyGb46V3pXMyU4srs rznQEYiRFV8BZccf7Z7EtHrlus/pPbHAya2UHgC9W8Lvoo5EhDjlISJMmnNmI X-Google-Smtp-Source: AJdET5ctl87/dqXf6bdBRw29fQWrPDgKICEXJLDQF68l2QLKEa9Behs/YHIqguLELUiMZXKxyWi7agOifVkj X-Received: by 2002:a37:9a90:: with SMTP id c138mr2150620qke.36.1540992404300; Wed, 31 Oct 2018 06:26:44 -0700 (PDT) Date: Wed, 31 Oct 2018 06:26:32 -0700 In-Reply-To: <20181031132634.50440-1-marcorr@google.com> Message-Id: <20181031132634.50440-3-marcorr@google.com> Mime-Version: 1.0 References: <20181031132634.50440-1-marcorr@google.com> X-Mailer: git-send-email 2.19.1.568.g152ad8e336-goog Subject: [kvm PATCH v5 2/4] kvm: x86: Dynamically allocate guest_fpu From: Marc Orr To: kvm@vger.kernel.org, jmattson@google.com, rientjes@google.com, konrad.wilk@oracle.com, linux-mm@kvack.org, akpm@linux-foundation.org, pbonzini@redhat.com, rkrcmar@redhat.com, willy@infradead.org, sean.j.christopherson@intel.com, dave.hansen@linux.intel.com, kernellwp@gmail.com Cc: Marc Orr Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Previously, the guest_fpu field was embedded in the kvm_vcpu_arch struct. Unfortunately, the field is quite large, (e.g., 4352 bytes on my current setup). This bloats the kvm_vcpu_arch struct for x86 into an order 3 memory allocation, which can become a problem on overcommitted machines. Thus, this patch moves the fpu state outside of the kvm_vcpu_arch struct. With this patch applied, the kvm_vcpu_arch struct is reduced to 15168 bytes for vmx on my setup when building the kernel with kvmconfig. Suggested-by: Dave Hansen Signed-off-by: Marc Orr --- arch/x86/include/asm/kvm_host.h | 3 ++- arch/x86/kvm/svm.c | 10 ++++++++ arch/x86/kvm/vmx.c | 10 ++++++++ arch/x86/kvm/x86.c | 45 +++++++++++++++++++++++---------- 4 files changed, 54 insertions(+), 14 deletions(-) diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index ebb1d7a755d4..c8a2a263f91f 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -610,7 +610,7 @@ struct kvm_vcpu_arch { * "guest_fpu" state here contains the guest FPU context, with the * host PRKU bits. */ - struct fpu guest_fpu; + struct fpu *guest_fpu; u64 xcr0; u64 guest_supported_xcr0; @@ -1194,6 +1194,7 @@ struct kvm_arch_async_pf { }; extern struct kvm_x86_ops *kvm_x86_ops; +extern struct kmem_cache *x86_fpu_cache; #define __KVM_HAVE_ARCH_VM_ALLOC static inline struct kvm *kvm_arch_alloc_vm(void) diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index f416f5c7f2ae..ac0c52ca22c6 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -2121,6 +2121,13 @@ static struct kvm_vcpu *svm_create_vcpu(struct kvm *kvm, unsigned int id) goto out; } + svm->vcpu.arch.guest_fpu = kmem_cache_zalloc(x86_fpu_cache, GFP_KERNEL); + if (!svm->vcpu.arch.guest_fpu) { + printk(KERN_ERR "kvm: failed to allocate vcpu's fpu\n"); + err = -ENOMEM; + goto free_partial_svm; + } + err = kvm_vcpu_init(&svm->vcpu, kvm, id); if (err) goto free_svm; @@ -2180,6 +2187,8 @@ static struct kvm_vcpu *svm_create_vcpu(struct kvm *kvm, unsigned int id) uninit: kvm_vcpu_uninit(&svm->vcpu); free_svm: + kmem_cache_free(x86_fpu_cache, svm->vcpu.arch.guest_fpu); +free_partial_svm: kmem_cache_free(kvm_vcpu_cache, svm); out: return ERR_PTR(err); @@ -2194,6 +2203,7 @@ static void svm_free_vcpu(struct kvm_vcpu *vcpu) __free_page(virt_to_page(svm->nested.hsave)); __free_pages(virt_to_page(svm->nested.msrpm), MSRPM_ALLOC_ORDER); kvm_vcpu_uninit(vcpu); + kmem_cache_free(x86_fpu_cache, svm->vcpu.arch.guest_fpu); kmem_cache_free(kvm_vcpu_cache, svm); /* * The vmcb page can be recycled, causing a false negative in diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index abeeb45d1c33..4078cf15a4b0 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -11476,6 +11476,7 @@ static void vmx_free_vcpu(struct kvm_vcpu *vcpu) free_loaded_vmcs(vmx->loaded_vmcs); kfree(vmx->guest_msrs); kvm_vcpu_uninit(vcpu); + kmem_cache_free(x86_fpu_cache, vmx->vcpu.arch.guest_fpu); kmem_cache_free(kvm_vcpu_cache, vmx); } @@ -11489,6 +11490,13 @@ static struct kvm_vcpu *vmx_create_vcpu(struct kvm *kvm, unsigned int id) if (!vmx) return ERR_PTR(-ENOMEM); + vmx->vcpu.arch.guest_fpu = kmem_cache_zalloc(x86_fpu_cache, GFP_KERNEL); + if (!vmx->vcpu.arch.guest_fpu) { + printk(KERN_ERR "kvm: failed to allocate vcpu's fpu\n"); + err = -ENOMEM; + goto free_partial_vcpu; + } + vmx->vpid = allocate_vpid(); err = kvm_vcpu_init(&vmx->vcpu, kvm, id); @@ -11576,6 +11584,8 @@ static struct kvm_vcpu *vmx_create_vcpu(struct kvm *kvm, unsigned int id) kvm_vcpu_uninit(&vmx->vcpu); free_vcpu: free_vpid(vmx->vpid); + kmem_cache_free(x86_fpu_cache, vmx->vcpu.arch.guest_fpu); +free_partial_vcpu: kmem_cache_free(kvm_vcpu_cache, vmx); return ERR_PTR(err); } diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index ff77514f7367..420516f0749a 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -213,6 +213,9 @@ struct kvm_stats_debugfs_item debugfs_entries[] = { u64 __read_mostly host_xcr0; +struct kmem_cache *x86_fpu_cache; +EXPORT_SYMBOL_GPL(x86_fpu_cache); + static int emulator_fix_hypercall(struct x86_emulate_ctxt *ctxt); static inline void kvm_async_pf_hash_reset(struct kvm_vcpu *vcpu) @@ -3635,7 +3638,7 @@ static int kvm_vcpu_ioctl_x86_set_debugregs(struct kvm_vcpu *vcpu, static void fill_xsave(u8 *dest, struct kvm_vcpu *vcpu) { - struct xregs_state *xsave = &vcpu->arch.guest_fpu.state.xsave; + struct xregs_state *xsave = &vcpu->arch.guest_fpu->state.xsave; u64 xstate_bv = xsave->header.xfeatures; u64 valid; @@ -3677,7 +3680,7 @@ static void fill_xsave(u8 *dest, struct kvm_vcpu *vcpu) static void load_xsave(struct kvm_vcpu *vcpu, u8 *src) { - struct xregs_state *xsave = &vcpu->arch.guest_fpu.state.xsave; + struct xregs_state *xsave = &vcpu->arch.guest_fpu->state.xsave; u64 xstate_bv = *(u64 *)(src + XSAVE_HDR_OFFSET); u64 valid; @@ -3725,7 +3728,7 @@ static void kvm_vcpu_ioctl_x86_get_xsave(struct kvm_vcpu *vcpu, fill_xsave((u8 *) guest_xsave->region, vcpu); } else { memcpy(guest_xsave->region, - &vcpu->arch.guest_fpu.state.fxsave, + &vcpu->arch.guest_fpu->state.fxsave, sizeof(struct fxregs_state)); *(u64 *)&guest_xsave->region[XSAVE_HDR_OFFSET / sizeof(u32)] = XFEATURE_MASK_FPSSE; @@ -3755,7 +3758,7 @@ static int kvm_vcpu_ioctl_x86_set_xsave(struct kvm_vcpu *vcpu, if (xstate_bv & ~XFEATURE_MASK_FPSSE || mxcsr & ~mxcsr_feature_mask) return -EINVAL; - memcpy(&vcpu->arch.guest_fpu.state.fxsave, + memcpy(&vcpu->arch.guest_fpu->state.fxsave, guest_xsave->region, sizeof(struct fxregs_state)); } return 0; @@ -6819,10 +6822,23 @@ int kvm_arch_init(void *opaque) } r = -ENOMEM; + x86_fpu_cache = kmem_cache_create_usercopy( + "x86_fpu", + sizeof(struct fpu), + __alignof__(struct fpu), + SLAB_ACCOUNT, + offsetof(struct fpu, state), + sizeof_field(struct fpu, state), + NULL); + if (!x86_fpu_cache) { + printk(KERN_ERR "kvm: failed to allocate cache for x86 fpu\n"); + goto out; + } + shared_msrs = alloc_percpu(struct kvm_shared_msrs); if (!shared_msrs) { printk(KERN_ERR "kvm: failed to allocate percpu kvm_shared_msrs\n"); - goto out; + goto out_free_x86_fpu_cache; } r = kvm_mmu_module_init(); @@ -6855,6 +6871,8 @@ int kvm_arch_init(void *opaque) out_free_percpu: free_percpu(shared_msrs); +out_free_x86_fpu_cache: + kmem_cache_destroy(x86_fpu_cache); out: return r; } @@ -6878,6 +6896,7 @@ void kvm_arch_exit(void) kvm_x86_ops = NULL; kvm_mmu_module_exit(); free_percpu(shared_msrs); + kmem_cache_destroy(x86_fpu_cache); } int kvm_vcpu_halt(struct kvm_vcpu *vcpu) @@ -8001,7 +8020,7 @@ static void kvm_load_guest_fpu(struct kvm_vcpu *vcpu) preempt_disable(); copy_fpregs_to_fpstate(¤t->thread.fpu); /* PKRU is separately restored in kvm_x86_ops->run. */ - __copy_kernel_to_fpregs(&vcpu->arch.guest_fpu.state, + __copy_kernel_to_fpregs(&vcpu->arch.guest_fpu->state, ~XFEATURE_MASK_PKRU); preempt_enable(); trace_kvm_fpu(1); @@ -8011,7 +8030,7 @@ static void kvm_load_guest_fpu(struct kvm_vcpu *vcpu) static void kvm_put_guest_fpu(struct kvm_vcpu *vcpu) { preempt_disable(); - copy_fpregs_to_fpstate(&vcpu->arch.guest_fpu); + copy_fpregs_to_fpstate(vcpu->arch.guest_fpu); copy_kernel_to_fpregs(¤t->thread.fpu.state); preempt_enable(); ++vcpu->stat.fpu_reload; @@ -8506,7 +8525,7 @@ int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) vcpu_load(vcpu); - fxsave = &vcpu->arch.guest_fpu.state.fxsave; + fxsave = &vcpu->arch.guest_fpu->state.fxsave; memcpy(fpu->fpr, fxsave->st_space, 128); fpu->fcw = fxsave->cwd; fpu->fsw = fxsave->swd; @@ -8526,7 +8545,7 @@ int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) vcpu_load(vcpu); - fxsave = &vcpu->arch.guest_fpu.state.fxsave; + fxsave = &vcpu->arch.guest_fpu->state.fxsave; memcpy(fxsave->st_space, fpu->fpr, 128); fxsave->cwd = fpu->fcw; @@ -8582,9 +8601,9 @@ static int sync_regs(struct kvm_vcpu *vcpu) static void fx_init(struct kvm_vcpu *vcpu) { - fpstate_init(&vcpu->arch.guest_fpu.state); + fpstate_init(&vcpu->arch.guest_fpu->state); if (boot_cpu_has(X86_FEATURE_XSAVES)) - vcpu->arch.guest_fpu.state.xsave.header.xcomp_bv = + vcpu->arch.guest_fpu->state.xsave.header.xcomp_bv = host_xcr0 | XSTATE_COMPACTION_ENABLED; /* @@ -8708,11 +8727,11 @@ void kvm_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event) */ if (init_event) kvm_put_guest_fpu(vcpu); - mpx_state_buffer = get_xsave_addr(&vcpu->arch.guest_fpu.state.xsave, + mpx_state_buffer = get_xsave_addr(&vcpu->arch.guest_fpu->state.xsave, XFEATURE_MASK_BNDREGS); if (mpx_state_buffer) memset(mpx_state_buffer, 0, sizeof(struct mpx_bndreg_state)); - mpx_state_buffer = get_xsave_addr(&vcpu->arch.guest_fpu.state.xsave, + mpx_state_buffer = get_xsave_addr(&vcpu->arch.guest_fpu->state.xsave, XFEATURE_MASK_BNDCSR); if (mpx_state_buffer) memset(mpx_state_buffer, 0, sizeof(struct mpx_bndcsr));