From patchwork Sat Dec 16 00:21:06 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Elliot Berman X-Patchwork-Id: 13495236 Received: from mx0b-0031df01.pphosted.com (mx0b-0031df01.pphosted.com [205.220.180.131]) (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 C43073527A; Sat, 16 Dec 2023 00:21:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=quicinc.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=quicinc.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=quicinc.com header.i=@quicinc.com header.b="E0uFamLU" Received: from pps.filterd (m0279870.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.24/8.17.1.24) with ESMTP id 3BFNnCBF026098; Sat, 16 Dec 2023 00:21:17 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; h= from:date:subject:mime-version:content-type :content-transfer-encoding:message-id:references:in-reply-to:to :cc; s=qcppdkim1; bh=8a59vkuZ6on+rnqsHsk3e+kiU8WVcrEgmmuTlTWOVYI =; b=E0uFamLUPsT3I/kre60qY9ToAxwgwpsLkrdZZ1eXWaTIY5IAsytUo/d8ivG RP3EwL4vpR1KyNhN0KMmM9OfhsBD6rNxkibbihcJpRa/XUSRar3BX8+VrTdY7Lkh E20iCmx7zi7Xh97HwF0lcf8fVXNfXx4G9SA7BC1VdY6dpNyC8UYOetO1lweNegWi QHb3iIIV/qnlKyfffLhMN1gjoknGtTyV9e6Z6YXvfH/Ma6SqPt5dDpuZBwwPPT+V sbYPx5D6wj6EqLifngDz8lBd/ZIoBiHQKIYADplyUfpm6tNEPZkTsuQBSELtXROj MZW/QkCPxh3Qi4e+s0N0Ac3azbQ== Received: from nasanppmta01.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3v0vv9ghjd-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Sat, 16 Dec 2023 00:21:17 +0000 (GMT) Received: from nasanex01b.na.qualcomm.com (nasanex01b.na.qualcomm.com [10.46.141.250]) by NASANPPMTA01.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTPS id 3BG0LGVS015677 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Sat, 16 Dec 2023 00:21:16 GMT Received: from [169.254.0.1] (10.49.16.6) by nasanex01b.na.qualcomm.com (10.46.141.250) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.40; Fri, 15 Dec 2023 16:21:15 -0800 From: Elliot Berman Date: Fri, 15 Dec 2023 16:21:06 -0800 Subject: [PATCH RFC v15 25/30] virt: gunyah: Enable demand paging Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-ID: <20231215-gunyah-v15-25-192a5d872a30@quicinc.com> References: <20231215-gunyah-v15-0-192a5d872a30@quicinc.com> In-Reply-To: <20231215-gunyah-v15-0-192a5d872a30@quicinc.com> To: Alex Elder , Srinivas Kandagatla , Murali Nalajal , Trilok Soni , Srivatsa Vaddagiri , Carl van Schaik , Philip Derrin , Prakruthi Deepak Heragu , Jonathan Corbet , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Catalin Marinas , Will Deacon , Konrad Dybcio , Bjorn Andersson , Dmitry Baryshkov , "Fuad Tabba" , Sean Christopherson CC: , , , , , Elliot Berman X-Mailer: b4 0.13-dev X-ClientProxiedBy: nalasex01a.na.qualcomm.com (10.47.209.196) To nasanex01b.na.qualcomm.com (10.46.141.250) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-GUID: i9H9U3HfAXjviR2sQmCMSiM37QlrkT9J X-Proofpoint-ORIG-GUID: i9H9U3HfAXjviR2sQmCMSiM37QlrkT9J X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.997,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-12-09_01,2023-12-07_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 impostorscore=0 phishscore=0 clxscore=1015 adultscore=0 malwarescore=0 priorityscore=1501 lowpriorityscore=0 suspectscore=0 mlxlogscore=633 mlxscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2311290000 definitions=main-2312160001 Tell resource manager to enable demand paging and wire vCPU faults to provide the backing folio when a guestmemfd is bound to the faulting access. Signed-off-by: Elliot Berman --- drivers/virt/gunyah/guest_memfd.c | 92 +++++++++++++++++++++++++++++++++++++++ drivers/virt/gunyah/gunyah_vcpu.c | 39 ++++++++++++++++- drivers/virt/gunyah/vm_mgr.c | 17 ++++++++ drivers/virt/gunyah/vm_mgr.h | 3 ++ include/linux/gunyah.h | 2 + 5 files changed, 152 insertions(+), 1 deletion(-) diff --git a/drivers/virt/gunyah/guest_memfd.c b/drivers/virt/gunyah/guest_memfd.c index 419ed617bd0b..206ce51c9a7d 100644 --- a/drivers/virt/gunyah/guest_memfd.c +++ b/drivers/virt/gunyah/guest_memfd.c @@ -732,3 +732,95 @@ int gunyah_gmem_reclaim_parcel(struct gunyah_vm *ghvm, up_read(&ghvm->mem_lock); return 0; } + +int gunyah_gmem_setup_demand_paging(struct gunyah_vm *ghvm) +{ + struct gunyah_rm_mem_entry *entries; + struct gunyah_gmem_binding *b; + unsigned long index = 0; + u32 count = 0, i; + int ret = 0; + + down_read(&ghvm->mem_lock); + mt_for_each(&ghvm->mem_layout, b, index, ULONG_MAX) + if (gunyah_guest_mem_is_lend(ghvm, b->flags)) + count++; + + if (!count) + goto out; + + entries = kcalloc(count, sizeof(*entries), GFP_KERNEL); + if (!entries) { + ret = -ENOMEM; + goto out; + } + + index = i = 0; + mt_for_each(&ghvm->mem_layout, b, index, ULONG_MAX) { + if (!gunyah_guest_mem_is_lend(ghvm, b->flags)) + continue; + entries[i].phys_addr = cpu_to_le64(gunyah_gfn_to_gpa(b->gfn)); + entries[i].size = cpu_to_le64(b->nr << PAGE_SHIFT); + if (++i == count) + break; + } + + ret = gunyah_rm_vm_set_demand_paging(ghvm->rm, ghvm->vmid, i, entries); + kfree(entries); +out: + up_read(&ghvm->mem_lock); + return ret; +} + +int gunyah_gmem_demand_page(struct gunyah_vm *ghvm, u64 gpa, bool write) +{ + unsigned long gfn = gunyah_gpa_to_gfn(gpa); + struct gunyah_gmem_binding *b; + struct folio *folio; + int ret; + + down_read(&ghvm->mem_lock); + b = mtree_load(&ghvm->mem_layout, gfn); + if (!b) { + up_read(&ghvm->mem_lock); + return -ENOENT; + } + + if (write && !(b->flags & GUNYAH_MEM_ALLOW_WRITE)) + return -EPERM; + + folio = gunyah_gmem_get_folio(b->inode, gunyah_gfn_to_off(b, gfn)); + if (IS_ERR(folio)) { + up_read(&ghvm->mem_lock); + pr_err_ratelimited( + "Failed to obtain memory for guest addr %016llx: %ld\n", + gpa, PTR_ERR(folio)); + return PTR_ERR(folio); + } + + if (gunyah_guest_mem_is_lend(ghvm, b->flags) && folio_mapped(folio)) { + ret = -EPERM; + goto out; + } + + gfn = gunyah_off_to_gfn(b, folio_index(folio)); + + ret = gunyah_vm_provide_folio(ghvm, folio, gfn, + !gunyah_guest_mem_is_lend(ghvm, b->flags), + !!(b->flags & GUNYAH_MEM_ALLOW_WRITE)); + if (ret) { + pr_err_ratelimited( + "Failed to provide folio for guest addr: %016llx: %d\n", + gpa, ret); + goto out; + } + + if (gunyah_guest_mem_is_lend(ghvm, b->flags)) + folio_set_private(folio); +out: + folio_unlock(folio); + folio_put(folio); + up_read(&ghvm->mem_lock); + return ret; +} +EXPORT_SYMBOL_GPL(gunyah_gmem_demand_page); diff --git a/drivers/virt/gunyah/gunyah_vcpu.c b/drivers/virt/gunyah/gunyah_vcpu.c index aa40f5977cbf..1952a1797430 100644 --- a/drivers/virt/gunyah/gunyah_vcpu.c +++ b/drivers/virt/gunyah/gunyah_vcpu.c @@ -91,6 +91,29 @@ static irqreturn_t gunyah_vcpu_irq_handler(int irq, void *data) return IRQ_HANDLED; } +static bool gunyah_handle_page_fault( + struct gunyah_vcpu *vcpu, u64 state_data[3], + const struct gunyah_hypercall_vcpu_run_resp *vcpu_run_resp) +{ + int ret = 0; + u64 addr = vcpu_run_resp->state_data[0]; + bool write = !!vcpu_run_resp->state_data[1]; + + ret = gunyah_gmem_demand_page(vcpu->ghvm, addr, write); + if (ret) { + if (ret != -ENOENT) + pr_warn_ratelimited( + "Failed to provide guest address for: %08llx: %d\n", + addr, ret); + + vcpu->vcpu_run->page_fault.resume_action = GUNYAH_VCPU_RESUME_FAULT; + vcpu->vcpu_run->page_fault.attempt = ret; + vcpu->vcpu_run->page_fault.phys_addr = addr; + vcpu->vcpu_run->exit_reason = GUNYAH_VCPU_EXIT_PAGE_FAULT; + } + return !!ret; +} + static bool gunyah_handle_mmio(struct gunyah_vcpu *vcpu, u64 state_data[3], const struct gunyah_hypercall_vcpu_run_resp *vcpu_run_resp) @@ -103,6 +126,12 @@ gunyah_handle_mmio(struct gunyah_vcpu *vcpu, u64 state_data[3], if (WARN_ON(len > sizeof(u64))) len = sizeof(u64); + if (!gunyah_gmem_demand_page(vcpu->ghvm, addr, + vcpu->vcpu_run->mmio.is_write)) { + state_data[1] = GUNYAH_ADDRSPACE_VMMIO_ACTION_RETRY; + return true; + } + if (vcpu_run_resp->state == GUNYAH_VCPU_ADDRSPACE_VMMIO_READ) { vcpu->vcpu_run->mmio.is_write = 0; /* Record that we need to give vCPU user's supplied value next gunyah_vcpu_run() */ @@ -120,7 +149,8 @@ gunyah_handle_mmio(struct gunyah_vcpu *vcpu, u64 state_data[3], vcpu->state = GUNYAH_VCPU_MMIO_WRITE; } - vcpu->vcpu_run->mmio.phys_addr = addr; + vcpu->vcpu_run->mmio.resume_action = 0; + vcpu->mmio_addr = vcpu->vcpu_run->mmio.phys_addr = addr; vcpu->vcpu_run->mmio.len = len; vcpu->vcpu_run->exit_reason = GUNYAH_VCPU_EXIT_MMIO; @@ -144,6 +174,8 @@ static int gunyah_handle_mmio_resume(struct gunyah_vcpu *vcpu, u64 state_data[3] state_data[1] = GUNYAH_ADDRSPACE_VMMIO_ACTION_FAULT; break; case GUNYAH_VCPU_RESUME_RETRY: + gunyah_gmem_demand_page(vcpu->ghvm, vcpu->mmio_addr, + vcpu->state == GUNYAH_VCPU_MMIO_WRITE); state_data[1] = GUNYAH_ADDRSPACE_VMMIO_ACTION_RETRY; break; default: @@ -300,6 +332,11 @@ static int gunyah_vcpu_run(struct gunyah_vcpu *vcpu) &vcpu_run_resp)) goto out; break; + case GUNYAH_VCPU_ADDRSPACE_PAGE_FAULT: + if (gunyah_handle_page_fault(vcpu, resume_data, + &vcpu_run_resp)) + goto out; + break; default: pr_warn_ratelimited( "Unknown vCPU state: %llx\n", diff --git a/drivers/virt/gunyah/vm_mgr.c b/drivers/virt/gunyah/vm_mgr.c index 8f8d962c9f8c..0bb2b6a461a5 100644 --- a/drivers/virt/gunyah/vm_mgr.c +++ b/drivers/virt/gunyah/vm_mgr.c @@ -653,6 +653,23 @@ static int gunyah_vm_start(struct gunyah_vm *ghvm) goto err; } + ret = gunyah_gmem_setup_demand_paging(ghvm); + if (ret) { + dev_warn(ghvm->parent, + "Failed to set up gmem demand paging: %d\n", ret); + goto err; + } + + ret = gunyah_rm_vm_set_address_layout( + ghvm->rm, ghvm->vmid, GUNYAH_RM_RANGE_ID_IMAGE, + ghvm->dtb.parcel_start << PAGE_SHIFT, + ghvm->dtb.parcel_pages << PAGE_SHIFT); + if (ret) { + dev_warn(ghvm->parent, + "Failed to set location of DTB mem parcel: %d\n", ret); + goto err; + } + ret = gunyah_rm_vm_init(ghvm->rm, ghvm->vmid); if (ret) { ghvm->vm_status = GUNYAH_RM_VM_STATUS_INIT_FAILED; diff --git a/drivers/virt/gunyah/vm_mgr.h b/drivers/virt/gunyah/vm_mgr.h index 357414e67d72..088ed9c55376 100644 --- a/drivers/virt/gunyah/vm_mgr.h +++ b/drivers/virt/gunyah/vm_mgr.h @@ -98,4 +98,7 @@ int gunyah_gmem_reclaim_parcel(struct gunyah_vm *ghvm, struct gunyah_rm_mem_parcel *parcel, u64 gfn, u64 nr); +int gunyah_gmem_setup_demand_paging(struct gunyah_vm *ghvm); +int gunyah_gmem_demand_page(struct gunyah_vm *ghvm, u64 gpa, bool write); + #endif diff --git a/include/linux/gunyah.h b/include/linux/gunyah.h index ae9be5eef7a9..ed461acb9e1b 100644 --- a/include/linux/gunyah.h +++ b/include/linux/gunyah.h @@ -223,6 +223,8 @@ struct gunyah_hypercall_vcpu_run_resp { GUNYAH_VCPU_ADDRSPACE_VMMIO_READ = 4, /* VCPU has returned for MMIO WRITE */ GUNYAH_VCPU_ADDRSPACE_VMMIO_WRITE = 5, + /* Host needs to satisfy a page fault */ + GUNYAH_VCPU_ADDRSPACE_PAGE_FAULT = 7, /* clang-format on */ } state; u64 sized_state;