From patchwork Thu Nov 7 17:02:56 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Leonardo Bras X-Patchwork-Id: 1191318 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (no SPF record) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=kvm-ppc-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=linux.ibm.com Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 4788qy4hqYz9sRc for ; Fri, 8 Nov 2019 04:03:42 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389735AbfKGRDk (ORCPT ); Thu, 7 Nov 2019 12:03:40 -0500 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:33762 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727606AbfKGRDa (ORCPT ); Thu, 7 Nov 2019 12:03:30 -0500 Received: from pps.filterd (m0098414.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id xA7GsEfp042405; Thu, 7 Nov 2019 12:03:15 -0500 Received: from ppma01wdc.us.ibm.com (fd.55.37a9.ip4.static.sl-reverse.com [169.55.85.253]) by mx0b-001b2d01.pphosted.com with ESMTP id 2w4pgdjdh1-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 07 Nov 2019 12:03:13 -0500 Received: from pps.filterd (ppma01wdc.us.ibm.com [127.0.0.1]) by ppma01wdc.us.ibm.com (8.16.0.27/8.16.0.27) with SMTP id xA7H1cNu006927; Thu, 7 Nov 2019 17:03:09 GMT Received: from b01cxnp22033.gho.pok.ibm.com (b01cxnp22033.gho.pok.ibm.com [9.57.198.23]) by ppma01wdc.us.ibm.com with ESMTP id 2w41uka623-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 07 Nov 2019 17:03:09 +0000 Received: from b01ledav005.gho.pok.ibm.com (b01ledav005.gho.pok.ibm.com [9.57.199.110]) by b01cxnp22033.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id xA7H35GY43712900 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 7 Nov 2019 17:03:05 GMT Received: from b01ledav005.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 58153AE060; Thu, 7 Nov 2019 17:03:05 +0000 (GMT) Received: from b01ledav005.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 4353BAE05C; Thu, 7 Nov 2019 17:03:04 +0000 (GMT) Received: from LeoBras.br.ibm.com (unknown [9.18.235.40]) by b01ledav005.gho.pok.ibm.com (Postfix) with ESMTP; Thu, 7 Nov 2019 17:03:04 +0000 (GMT) From: Leonardo Bras To: kvm-ppc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org Cc: Leonardo Bras , Paul Mackerras , Benjamin Herrenschmidt , Michael Ellerman Subject: [PATCH v2 2/4] powerpc/kvm/book3s: Replace current->mm by kvm->mm Date: Thu, 7 Nov 2019 14:02:56 -0300 Message-Id: <20191107170258.36379-3-leonardo@linux.ibm.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20191107170258.36379-1-leonardo@linux.ibm.com> References: <20191107170258.36379-1-leonardo@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2019-11-07_05:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=665 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1910280000 definitions=main-1911070159 Sender: kvm-ppc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm-ppc@vger.kernel.org Given that in kvm_create_vm() there is: kvm->mm = current->mm; And that on every kvm_*_ioctl we have: if (kvm->mm != current->mm) return -EIO; I see no reason to keep using current->mm instead of kvm->mm. By doing so, we would reduce the use of 'global' variables on code, relying more in the contents of kvm struct. Signed-off-by: Leonardo Bras --- arch/powerpc/kvm/book3s_64_mmu_hv.c | 10 +++++----- arch/powerpc/kvm/book3s_64_vio.c | 10 ++++++---- arch/powerpc/kvm/book3s_hv.c | 10 +++++----- 3 files changed, 16 insertions(+), 14 deletions(-) diff --git a/arch/powerpc/kvm/book3s_64_mmu_hv.c b/arch/powerpc/kvm/book3s_64_mmu_hv.c index 9a75f0e1933b..43b3cdf011bd 100644 --- a/arch/powerpc/kvm/book3s_64_mmu_hv.c +++ b/arch/powerpc/kvm/book3s_64_mmu_hv.c @@ -296,7 +296,7 @@ static long kvmppc_virtmode_do_h_enter(struct kvm *kvm, unsigned long flags, /* Protect linux PTE lookup from page table destruction */ rcu_read_lock_sched(); /* this disables preemption too */ ret = kvmppc_do_h_enter(kvm, flags, pte_index, pteh, ptel, - current->mm->pgd, false, pte_idx_ret); + kvm->mm->pgd, false, pte_idx_ret); rcu_read_unlock_sched(); if (ret == H_TOO_HARD) { /* this can't happen */ @@ -592,8 +592,8 @@ int kvmppc_book3s_hv_page_fault(struct kvm_run *run, struct kvm_vcpu *vcpu, npages = get_user_pages_fast(hva, 1, writing ? FOLL_WRITE : 0, pages); if (npages < 1) { /* Check if it's an I/O mapping */ - down_read(¤t->mm->mmap_sem); - vma = find_vma(current->mm, hva); + down_read(&kvm->mm->mmap_sem); + vma = find_vma(kvm->mm, hva); if (vma && vma->vm_start <= hva && hva + psize <= vma->vm_end && (vma->vm_flags & VM_PFNMAP)) { pfn = vma->vm_pgoff + @@ -602,7 +602,7 @@ int kvmppc_book3s_hv_page_fault(struct kvm_run *run, struct kvm_vcpu *vcpu, is_ci = pte_ci(__pte((pgprot_val(vma->vm_page_prot)))); write_ok = vma->vm_flags & VM_WRITE; } - up_read(¤t->mm->mmap_sem); + up_read(&kvm->mm->mmap_sem); if (!pfn) goto out_put; } else { @@ -621,7 +621,7 @@ int kvmppc_book3s_hv_page_fault(struct kvm_run *run, struct kvm_vcpu *vcpu, * hugepage split and collapse. */ local_irq_save(flags); - ptep = find_current_mm_pte(current->mm->pgd, + ptep = find_current_mm_pte(kvm->mm->pgd, hva, NULL, NULL); if (ptep) { pte = kvmppc_read_update_linux_pte(ptep, 1); diff --git a/arch/powerpc/kvm/book3s_64_vio.c b/arch/powerpc/kvm/book3s_64_vio.c index a402ead833b6..308aa3a639a5 100644 --- a/arch/powerpc/kvm/book3s_64_vio.c +++ b/arch/powerpc/kvm/book3s_64_vio.c @@ -253,10 +253,11 @@ static int kvm_spapr_tce_release(struct inode *inode, struct file *filp) } } + account_locked_vm(kvm->mm, + kvmppc_stt_pages(kvmppc_tce_pages(stt->size)), false); + kvm_put_kvm(stt->kvm); - account_locked_vm(current->mm, - kvmppc_stt_pages(kvmppc_tce_pages(stt->size)), false); call_rcu(&stt->rcu, release_spapr_tce_table); return 0; @@ -272,6 +273,7 @@ long kvm_vm_ioctl_create_spapr_tce(struct kvm *kvm, { struct kvmppc_spapr_tce_table *stt = NULL; struct kvmppc_spapr_tce_table *siter; + struct mm_struct *mm = kvm->mm; unsigned long npages, size = args->size; int ret = -ENOMEM; @@ -280,7 +282,7 @@ long kvm_vm_ioctl_create_spapr_tce(struct kvm *kvm, return -EINVAL; npages = kvmppc_tce_pages(size); - ret = account_locked_vm(current->mm, kvmppc_stt_pages(npages), true); + ret = account_locked_vm(mm, kvmppc_stt_pages(npages), true); if (ret) return ret; @@ -325,7 +327,7 @@ long kvm_vm_ioctl_create_spapr_tce(struct kvm *kvm, kvm_put_kvm(kvm); kfree(stt); fail_acct: - account_locked_vm(current->mm, kvmppc_stt_pages(npages), false); + account_locked_vm(mm, kvmppc_stt_pages(npages), false); return ret; } diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c index 709cf1fd4cf4..679008c511e4 100644 --- a/arch/powerpc/kvm/book3s_hv.c +++ b/arch/powerpc/kvm/book3s_hv.c @@ -4280,7 +4280,7 @@ static int kvmppc_vcpu_run_hv(struct kvm_run *run, struct kvm_vcpu *vcpu) user_vrsave = mfspr(SPRN_VRSAVE); vcpu->arch.wqp = &vcpu->arch.vcore->wq; - vcpu->arch.pgdir = current->mm->pgd; + vcpu->arch.pgdir = kvm->mm->pgd; vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST; do { @@ -4612,14 +4612,14 @@ static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu) /* Look up the VMA for the start of this memory slot */ hva = memslot->userspace_addr; - down_read(¤t->mm->mmap_sem); - vma = find_vma(current->mm, hva); + down_read(&kvm->mm->mmap_sem); + vma = find_vma(kvm->mm, hva); if (!vma || vma->vm_start > hva || (vma->vm_flags & VM_IO)) goto up_out; psize = vma_kernel_pagesize(vma); - up_read(¤t->mm->mmap_sem); + up_read(&kvm->mm->mmap_sem); /* We can handle 4k, 64k or 16M pages in the VRMA */ if (psize >= 0x1000000) @@ -4652,7 +4652,7 @@ static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu) return err; up_out: - up_read(¤t->mm->mmap_sem); + up_read(&kvm->mm->mmap_sem); goto out_srcu; }