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Tue, 14 Feb 2023 21:24:26 GMT Received: from hu-eberman-lv.qualcomm.com (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 15.2.986.36; Tue, 14 Feb 2023 13:24:25 -0800 From: Elliot Berman To: Alex Elder , Srinivas Kandagatla , Elliot Berman , Prakruthi Deepak Heragu CC: Murali Nalajala , Trilok Soni , Srivatsa Vaddagiri , Carl van Schaik , Dmitry Baryshkov , Bjorn Andersson , "Konrad Dybcio" , Arnd Bergmann , "Greg Kroah-Hartman" , Rob Herring , Krzysztof Kozlowski , Jonathan Corbet , Bagas Sanjaya , Catalin Marinas , Jassi Brar , , , , , Subject: [PATCH v10 12/26] gunyah: vm_mgr: Add/remove user memory regions Date: Tue, 14 Feb 2023 13:24:16 -0800 Message-ID: <20230214212417.3315422-1-quic_eberman@quicinc.com> X-Mailer: git-send-email 2.39.1 In-Reply-To: <20230214211229.3239350-1-quic_eberman@quicinc.com> References: <20230214211229.3239350-1-quic_eberman@quicinc.com> MIME-Version: 1.0 X-Originating-IP: [10.49.16.6] 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-ORIG-GUID: M3xnN_hAHgVPd3kXu-9fmJ6T5o_f977i X-Proofpoint-GUID: M3xnN_hAHgVPd3kXu-9fmJ6T5o_f977i X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.219,Aquarius:18.0.930,Hydra:6.0.562,FMLib:17.11.170.22 definitions=2023-02-14_15,2023-02-14_01,2023-02-09_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 mlxlogscore=999 mlxscore=0 spamscore=0 impostorscore=0 lowpriorityscore=0 malwarescore=0 priorityscore=1501 clxscore=1015 adultscore=0 bulkscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2212070000 definitions=main-2302140184 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230214_132436_999340_F27268C9 X-CRM114-Status: GOOD ( 35.15 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org When launching a virtual machine, Gunyah userspace allocates memory for the guest and informs Gunyah about these memory regions through SET_USER_MEMORY_REGION ioctl. Co-developed-by: Prakruthi Deepak Heragu Signed-off-by: Prakruthi Deepak Heragu Signed-off-by: Elliot Berman --- drivers/virt/gunyah/Makefile | 2 +- drivers/virt/gunyah/vm_mgr.c | 44 ++++++ drivers/virt/gunyah/vm_mgr.h | 25 ++++ drivers/virt/gunyah/vm_mgr_mm.c | 235 ++++++++++++++++++++++++++++++++ include/uapi/linux/gunyah.h | 33 +++++ 5 files changed, 338 insertions(+), 1 deletion(-) create mode 100644 drivers/virt/gunyah/vm_mgr_mm.c diff --git a/drivers/virt/gunyah/Makefile b/drivers/virt/gunyah/Makefile index 03951cf82023..ff8bc4925392 100644 --- a/drivers/virt/gunyah/Makefile +++ b/drivers/virt/gunyah/Makefile @@ -2,5 +2,5 @@ obj-$(CONFIG_GUNYAH) += gunyah.o -gunyah_rsc_mgr-y += rsc_mgr.o rsc_mgr_rpc.o vm_mgr.o +gunyah_rsc_mgr-y += rsc_mgr.o rsc_mgr_rpc.o vm_mgr.o vm_mgr_mm.o obj-$(CONFIG_GUNYAH) += gunyah_rsc_mgr.o diff --git a/drivers/virt/gunyah/vm_mgr.c b/drivers/virt/gunyah/vm_mgr.c index fd890a57172e..84102bac03cc 100644 --- a/drivers/virt/gunyah/vm_mgr.c +++ b/drivers/virt/gunyah/vm_mgr.c @@ -18,8 +18,16 @@ static void gh_vm_free(struct work_struct *work) { struct gh_vm *ghvm = container_of(work, struct gh_vm, free_work); + struct gh_vm_mem *mapping, *tmp; int ret; + mutex_lock(&ghvm->mm_lock); + list_for_each_entry_safe(mapping, tmp, &ghvm->memory_mappings, list) { + gh_vm_mem_reclaim(ghvm, mapping); + kfree(mapping); + } + mutex_unlock(&ghvm->mm_lock); + ret = gh_rm_dealloc_vmid(ghvm->rm, ghvm->vmid); if (ret) pr_warn("Failed to deallocate vmid: %d\n", ret); @@ -48,11 +56,46 @@ static __must_check struct gh_vm *gh_vm_alloc(struct gh_rm *rm) ghvm->vmid = vmid; ghvm->rm = rm; + mutex_init(&ghvm->mm_lock); + INIT_LIST_HEAD(&ghvm->memory_mappings); INIT_WORK(&ghvm->free_work, gh_vm_free); return ghvm; } +static long gh_vm_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) +{ + struct gh_vm *ghvm = filp->private_data; + void __user *argp = (void __user *)arg; + long r; + + switch (cmd) { + case GH_VM_SET_USER_MEM_REGION: { + struct gh_userspace_memory_region region; + + if (copy_from_user(®ion, argp, sizeof(region))) + return -EFAULT; + + /* All other flag bits are reserved for future use */ + if (region.flags & ~(GH_MEM_ALLOW_READ | GH_MEM_ALLOW_WRITE | GH_MEM_ALLOW_EXEC | + GH_MEM_LENT)) + return -EINVAL; + + + if (region.memory_size) + r = gh_vm_mem_alloc(ghvm, ®ion); + else + r = gh_vm_mem_free(ghvm, region.label); + break; + } + default: + r = -ENOTTY; + break; + } + + return r; +} + static int gh_vm_release(struct inode *inode, struct file *filp) { struct gh_vm *ghvm = filp->private_data; @@ -65,6 +108,7 @@ static int gh_vm_release(struct inode *inode, struct file *filp) } static const struct file_operations gh_vm_fops = { + .unlocked_ioctl = gh_vm_ioctl, .release = gh_vm_release, .compat_ioctl = compat_ptr_ioctl, .llseek = noop_llseek, diff --git a/drivers/virt/gunyah/vm_mgr.h b/drivers/virt/gunyah/vm_mgr.h index 76954da706e9..97bc00c34878 100644 --- a/drivers/virt/gunyah/vm_mgr.h +++ b/drivers/virt/gunyah/vm_mgr.h @@ -7,16 +7,41 @@ #define _GH_PRIV_VM_MGR_H #include +#include +#include +#include #include long gh_dev_vm_mgr_ioctl(struct gh_rm *rm, unsigned int cmd, unsigned long arg); +enum gh_vm_mem_share_type { + VM_MEM_SHARE, + VM_MEM_LEND, +}; + +struct gh_vm_mem { + struct list_head list; + enum gh_vm_mem_share_type share_type; + struct gh_rm_mem_parcel parcel; + + __u64 guest_phys_addr; + struct page **pages; + unsigned long npages; +}; + struct gh_vm { u16 vmid; struct gh_rm *rm; struct work_struct free_work; + struct mutex mm_lock; + struct list_head memory_mappings; }; +int gh_vm_mem_alloc(struct gh_vm *ghvm, struct gh_userspace_memory_region *region); +void gh_vm_mem_reclaim(struct gh_vm *ghvm, struct gh_vm_mem *mapping); +int gh_vm_mem_free(struct gh_vm *ghvm, u32 label); +struct gh_vm_mem *gh_vm_mem_find(struct gh_vm *ghvm, u32 label); + #endif diff --git a/drivers/virt/gunyah/vm_mgr_mm.c b/drivers/virt/gunyah/vm_mgr_mm.c new file mode 100644 index 000000000000..03e71a36ea3b --- /dev/null +++ b/drivers/virt/gunyah/vm_mgr_mm.c @@ -0,0 +1,235 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2022-2023 Qualcomm Innovation Center, Inc. All rights reserved. + */ + +#define pr_fmt(fmt) "gh_vm_mgr: " fmt + +#include +#include + +#include + +#include "vm_mgr.h" + +static inline bool page_contiguous(phys_addr_t p, phys_addr_t t) +{ + return t - p == PAGE_SIZE; +} + +static struct gh_vm_mem *__gh_vm_mem_find(struct gh_vm *ghvm, u32 label) + __must_hold(&ghvm->mm_lock) +{ + struct gh_vm_mem *mapping; + + list_for_each_entry(mapping, &ghvm->memory_mappings, list) + if (mapping->parcel.label == label) + return mapping; + + return NULL; +} + +void gh_vm_mem_reclaim(struct gh_vm *ghvm, struct gh_vm_mem *mapping) + __must_hold(&ghvm->mm_lock) +{ + int i, ret = 0; + + if (mapping->parcel.mem_handle != GH_MEM_HANDLE_INVAL) { + ret = gh_rm_mem_reclaim(ghvm->rm, &mapping->parcel); + if (ret) + pr_warn("Failed to reclaim memory parcel for label %d: %d\n", + mapping->parcel.label, ret); + } + + if (!ret) + for (i = 0; i < mapping->npages; i++) + unpin_user_page(mapping->pages[i]); + + kfree(mapping->pages); + kfree(mapping->parcel.acl_entries); + kfree(mapping->parcel.mem_entries); + + list_del(&mapping->list); +} + +struct gh_vm_mem *gh_vm_mem_find(struct gh_vm *ghvm, u32 label) +{ + struct gh_vm_mem *mapping; + int ret; + + ret = mutex_lock_interruptible(&ghvm->mm_lock); + if (ret) + return ERR_PTR(ret); + mapping = __gh_vm_mem_find(ghvm, label); + mutex_unlock(&ghvm->mm_lock); + return mapping ? : ERR_PTR(-ENODEV); +} + +int gh_vm_mem_alloc(struct gh_vm *ghvm, struct gh_userspace_memory_region *region) +{ + struct gh_vm_mem *mapping, *tmp_mapping; + struct gh_rm_mem_entry *mem_entries; + phys_addr_t curr_page, prev_page; + struct gh_rm_mem_parcel *parcel; + int i, j, pinned, ret = 0; + size_t entry_size; + u16 vmid; + + if (!gh_api_has_feature(GH_API_FEATURE_MEMEXTENT)) + return -EOPNOTSUPP; + + if (!region->memory_size || !PAGE_ALIGNED(region->memory_size) || + !PAGE_ALIGNED(region->userspace_addr) || !PAGE_ALIGNED(region->guest_phys_addr)) + return -EINVAL; + + ret = mutex_lock_interruptible(&ghvm->mm_lock); + if (ret) + return ret; + mapping = __gh_vm_mem_find(ghvm, region->label); + if (mapping) { + mutex_unlock(&ghvm->mm_lock); + return -EEXIST; + } + + mapping = kzalloc(sizeof(*mapping), GFP_KERNEL); + if (!mapping) { + ret = -ENOMEM; + goto free_mapping; + } + + mapping->parcel.label = region->label; + mapping->guest_phys_addr = region->guest_phys_addr; + mapping->npages = region->memory_size >> PAGE_SHIFT; + parcel = &mapping->parcel; + parcel->mem_handle = GH_MEM_HANDLE_INVAL; /* to be filled later by mem_share/mem_lend */ + parcel->mem_type = GH_RM_MEM_TYPE_NORMAL; + + /* Check for overlap */ + list_for_each_entry(tmp_mapping, &ghvm->memory_mappings, list) { + if (!((mapping->guest_phys_addr + (mapping->npages << PAGE_SHIFT) <= + tmp_mapping->guest_phys_addr) || + (mapping->guest_phys_addr >= + tmp_mapping->guest_phys_addr + (tmp_mapping->npages << PAGE_SHIFT)))) { + ret = -EEXIST; + goto free_mapping; + } + } + + list_add(&mapping->list, &ghvm->memory_mappings); + + mapping->pages = kcalloc(mapping->npages, sizeof(*mapping->pages), GFP_KERNEL); + if (!mapping->pages) { + ret = -ENOMEM; + mapping->npages = 0; /* update npages for reclaim */ + goto reclaim; + } + + pinned = pin_user_pages_fast(region->userspace_addr, mapping->npages, + FOLL_WRITE | FOLL_LONGTERM, mapping->pages); + if (pinned < 0) { + ret = pinned; + mapping->npages = 0; /* update npages for reclaim */ + goto reclaim; + } else if (pinned != mapping->npages) { + ret = -EFAULT; + mapping->npages = pinned; /* update npages for reclaim */ + goto reclaim; + } + + if (region->flags & GH_MEM_LENT) { + parcel->n_acl_entries = 1; + mapping->share_type = VM_MEM_LEND; + } else { + parcel->n_acl_entries = 2; + mapping->share_type = VM_MEM_SHARE; + } + parcel->acl_entries = kcalloc(parcel->n_acl_entries, sizeof(*parcel->acl_entries), + GFP_KERNEL); + if (!parcel->acl_entries) { + ret = -ENOMEM; + goto reclaim; + } + + parcel->acl_entries[0].vmid = cpu_to_le16(ghvm->vmid); + if (region->flags & GH_MEM_ALLOW_READ) + parcel->acl_entries[0].perms |= GH_RM_ACL_R; + if (region->flags & GH_MEM_ALLOW_WRITE) + parcel->acl_entries[0].perms |= GH_RM_ACL_W; + if (region->flags & GH_MEM_ALLOW_EXEC) + parcel->acl_entries[0].perms |= GH_RM_ACL_X; + + if (mapping->share_type == VM_MEM_SHARE) { + ret = gh_rm_get_vmid(ghvm->rm, &vmid); + if (ret) + goto reclaim; + + parcel->acl_entries[1].vmid = cpu_to_le16(vmid); + /* Host assumed to have all these permissions. Gunyah will not + * grant new permissions if host actually had less than RWX + */ + parcel->acl_entries[1].perms |= GH_RM_ACL_R | GH_RM_ACL_W | GH_RM_ACL_X; + } + + mem_entries = kcalloc(mapping->npages, sizeof(*mem_entries), GFP_KERNEL); + if (!mem_entries) { + ret = -ENOMEM; + goto reclaim; + } + + /* reduce number of entries by combining contiguous pages into single memory entry */ + prev_page = page_to_phys(mapping->pages[0]); + mem_entries[0].ipa_base = cpu_to_le64(prev_page); + entry_size = PAGE_SIZE; + for (i = 1, j = 0; i < mapping->npages; i++) { + curr_page = page_to_phys(mapping->pages[i]); + if (page_contiguous(prev_page, curr_page)) { + entry_size += PAGE_SIZE; + } else { + mem_entries[j].size = cpu_to_le64(entry_size); + j++; + mem_entries[j].ipa_base = cpu_to_le64(curr_page); + entry_size = PAGE_SIZE; + } + + prev_page = curr_page; + } + mem_entries[j].size = cpu_to_le64(entry_size); + + parcel->n_mem_entries = j + 1; + parcel->mem_entries = kmemdup(mem_entries, sizeof(*mem_entries) * parcel->n_mem_entries, + GFP_KERNEL); + kfree(mem_entries); + if (!parcel->mem_entries) { + ret = -ENOMEM; + goto reclaim; + } + + mutex_unlock(&ghvm->mm_lock); + return 0; +reclaim: + gh_vm_mem_reclaim(ghvm, mapping); +free_mapping: + kfree(mapping); + mutex_unlock(&ghvm->mm_lock); + return ret; +} + +int gh_vm_mem_free(struct gh_vm *ghvm, u32 label) +{ + struct gh_vm_mem *mapping; + int ret; + + ret = mutex_lock_interruptible(&ghvm->mm_lock); + if (ret) + return ret; + + mapping = __gh_vm_mem_find(ghvm, label); + if (!mapping) + goto out; + + gh_vm_mem_reclaim(ghvm, mapping); + kfree(mapping); +out: + mutex_unlock(&ghvm->mm_lock); + return ret; +} diff --git a/include/uapi/linux/gunyah.h b/include/uapi/linux/gunyah.h index 10ba32d2b0a6..d85d12119a48 100644 --- a/include/uapi/linux/gunyah.h +++ b/include/uapi/linux/gunyah.h @@ -20,4 +20,37 @@ */ #define GH_CREATE_VM _IO(GH_IOCTL_TYPE, 0x0) /* Returns a Gunyah VM fd */ +/* + * ioctls for VM fds + */ + +/** + * struct gh_userspace_memory_region - Userspace memory descripion for GH_VM_SET_USER_MEM_REGION + * @label: Unique identifer to the region. + * @flags: Flags for memory parcel behavior + * @guest_phys_addr: Location of the memory region in guest's memory space (page-aligned) + * @memory_size: Size of the region (page-aligned) + * @userspace_addr: Location of the memory region in caller (userspace)'s memory + * + * See Documentation/virt/gunyah/vm-manager.rst for further details. + */ +struct gh_userspace_memory_region { + __u32 label; +#define GH_MEM_ALLOW_READ (1UL << 0) +#define GH_MEM_ALLOW_WRITE (1UL << 1) +#define GH_MEM_ALLOW_EXEC (1UL << 2) +/* + * The guest will be lent the memory instead of shared. + * In other words, the guest has exclusive access to the memory region and the host loses access. + */ +#define GH_MEM_LENT (1UL << 3) + __u32 flags; + __u64 guest_phys_addr; + __u64 memory_size; + __u64 userspace_addr; +}; + +#define GH_VM_SET_USER_MEM_REGION _IOW(GH_IOCTL_TYPE, 0x1, \ + struct gh_userspace_memory_region) + #endif