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Thu, 22 Feb 2024 15:16:40 -0800 From: Elliot Berman Date: Thu, 22 Feb 2024 15:16:48 -0800 Subject: [PATCH v17 25/35] virt: gunyah: guestmem: Initialize RM mem parcels from guestmem MIME-Version: 1.0 Message-ID: <20240222-gunyah-v17-25-1e9da6763d38@quicinc.com> References: <20240222-gunyah-v17-0-1e9da6763d38@quicinc.com> In-Reply-To: <20240222-gunyah-v17-0-1e9da6763d38@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 , "Andrew Morton" CC: , , , , , , Elliot Berman X-Mailer: b4 0.12.4 X-Originating-IP: [10.49.16.6] X-ClientProxiedBy: nalasex01c.na.qualcomm.com (10.47.97.35) 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: vR1aZuf4fzB2Ai69DQJ86JT63-NanqyJ X-Proofpoint-ORIG-GUID: vR1aZuf4fzB2Ai69DQJ86JT63-NanqyJ X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.1011,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2024-02-22_15,2024-02-22_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 suspectscore=0 malwarescore=0 impostorscore=0 priorityscore=1501 lowpriorityscore=0 spamscore=0 adultscore=0 mlxlogscore=999 clxscore=1015 bulkscore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2402120000 definitions=main-2402220179 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240222_231702_595997_DED5D429 X-CRM114-Status: GOOD ( 23.60 ) 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 Gunyah Resource Manager sets up a virtual machine based on a device tree which lives in guest memory. Resource manager requires this memory to be provided as a memory parcel for it to read and manipulate. Implement a function to construct a memory parcel from a guestmem binding. Signed-off-by: Elliot Berman --- drivers/virt/gunyah/guest_memfd.c | 207 ++++++++++++++++++++++++++++++++++++++ drivers/virt/gunyah/vm_mgr.h | 6 ++ 2 files changed, 213 insertions(+) diff --git a/drivers/virt/gunyah/guest_memfd.c b/drivers/virt/gunyah/guest_memfd.c index d6be8bf67d996..0c35ffa616d9c 100644 --- a/drivers/virt/gunyah/guest_memfd.c +++ b/drivers/virt/gunyah/guest_memfd.c @@ -684,3 +684,210 @@ int gunyah_gmem_modify_mapping(struct gunyah_vm *ghvm, fput(file); return ret; } + +int gunyah_gmem_share_parcel(struct gunyah_vm *ghvm, struct gunyah_rm_mem_parcel *parcel, + u64 *gfn, u64 *nr) +{ + struct folio *folio, *prev_folio; + unsigned long nr_entries, i, j, start, end; + struct gunyah_gmem_binding *b; + bool lend; + int ret; + + parcel->mem_handle = GUNYAH_MEM_HANDLE_INVAL; + + if (!*nr) + return -EINVAL; + + down_read(&ghvm->bindings_lock); + b = mtree_load(&ghvm->bindings, *gfn); + if (!b || *gfn > b->gfn + b->nr || *gfn < b->gfn) { + ret = -ENOENT; + goto unlock; + } + + /** + * Generally, indices can be based on gfn, guest_memfd offset, or + * offset into binding. start and end are based on offset into binding. + */ + start = *gfn - b->gfn; + + if (start + *nr > b->nr) { + ret = -ENOENT; + goto unlock; + } + + end = start + *nr; + lend = gunyah_guest_mem_is_lend(ghvm, b->flags); + + /** + * First, calculate the number of physically discontiguous regions + * the parcel covers. Each memory entry corresponds to one folio. + * In future, each memory entry could correspond to contiguous + * folios that are also adjacent in guest_memfd, but parcels + * are only being used for small amounts of memory for now, so + * this optimization is premature. + */ + nr_entries = 0; + prev_folio = NULL; + for (i = start + b->i_off; i < end + b->i_off;) { + folio = gunyah_gmem_get_folio(file_inode(b->file), i); /* A */ + if (!folio) { + ret = -ENOMEM; + goto out; + } + + if (lend) { + /* don't lend a folio that is mapped by host */ + if (!gunyah_folio_lend_safe(folio)) { + folio_unlock(folio); + folio_put(folio); + ret = -EPERM; + goto out; + } + folio_set_private(folio); + } + + nr_entries++; + i = folio_index(folio) + folio_nr_pages(folio); + } + end = i - b->i_off; + + parcel->mem_entries = + kcalloc(nr_entries, sizeof(*parcel->mem_entries), GFP_KERNEL); + if (!parcel->mem_entries) { + ret = -ENOMEM; + goto out; + } + + /** + * Walk through all the folios again, now filling the mem_entries array. + */ + j = 0; + prev_folio = NULL; + for (i = start + b->i_off; i < end + b->i_off; j++) { + folio = filemap_get_folio(file_inode(b->file)->i_mapping, i); /* B */ + if (WARN_ON(IS_ERR(folio))) { + ret = PTR_ERR(folio); + i = end + b->i_off; + goto out; + } + + parcel->mem_entries[j].size = cpu_to_le64(folio_size(folio)); + parcel->mem_entries[j].phys_addr = cpu_to_le64(PFN_PHYS(folio_pfn(folio))); + i = folio_index(folio) + folio_nr_pages(folio); + folio_put(folio); /* B */ + } + BUG_ON(j != nr_entries); + parcel->n_mem_entries = nr_entries; + + if (lend) + parcel->n_acl_entries = 1; + + parcel->acl_entries = kcalloc(parcel->n_acl_entries, + sizeof(*parcel->acl_entries), GFP_KERNEL); + if (!parcel->n_acl_entries) { + ret = -ENOMEM; + goto free_entries; + } + + parcel->acl_entries[0].vmid = cpu_to_le16(ghvm->vmid); + if (b->flags & GUNYAH_MEM_ALLOW_READ) + parcel->acl_entries[0].perms |= GUNYAH_RM_ACL_R; + if (b->flags & GUNYAH_MEM_ALLOW_WRITE) + parcel->acl_entries[0].perms |= GUNYAH_RM_ACL_W; + if (b->flags & GUNYAH_MEM_ALLOW_EXEC) + parcel->acl_entries[0].perms |= GUNYAH_RM_ACL_X; + + if (!lend) { + u16 host_vmid; + + ret = gunyah_rm_get_vmid(ghvm->rm, &host_vmid); + if (ret) + goto free_acl; + + parcel->acl_entries[1].vmid = cpu_to_le16(host_vmid); + parcel->acl_entries[1].perms = GUNYAH_RM_ACL_R | GUNYAH_RM_ACL_W | GUNYAH_RM_ACL_X; + } + + parcel->mem_handle = GUNYAH_MEM_HANDLE_INVAL; + folio = filemap_get_folio(file_inode(b->file)->i_mapping, start); /* C */ + *gfn = folio_index(folio) - b->i_off + b->gfn; + *nr = end - (folio_index(folio) - b->i_off); + folio_put(folio); /* C */ + + ret = gunyah_rm_mem_share(ghvm->rm, parcel); + goto out; +free_acl: + kfree(parcel->acl_entries); + parcel->acl_entries = NULL; +free_entries: + kfree(parcel->mem_entries); + parcel->mem_entries = NULL; + parcel->n_mem_entries = 0; +out: + /* unlock the folios */ + for (j = start + b->i_off; j < i;) { + folio = filemap_get_folio(file_inode(b->file)->i_mapping, j); /* D */ + if (WARN_ON(IS_ERR(folio))) + continue; + j = folio_index(folio) + folio_nr_pages(folio); + folio_unlock(folio); /* A */ + if (ret) { + if (folio_test_private(folio)) { + gunyah_folio_host_reclaim(folio); + folio_clear_private(folio); + } + folio_put(folio); /* A */ + } + folio_put(folio); /* D */ + /* matching folio_put for A is done at + * (1) gunyah_gmem_reclaim_parcel or + * (2) after gunyah_gmem_parcel_to_paged, gunyah_vm_reclaim_folio + */ + } +unlock: + up_read(&ghvm->bindings_lock); + return ret; +} + +int gunyah_gmem_reclaim_parcel(struct gunyah_vm *ghvm, + struct gunyah_rm_mem_parcel *parcel, u64 gfn, + u64 nr) +{ + struct gunyah_rm_mem_entry *entry; + struct folio *folio; + pgoff_t i; + int ret; + + if (parcel->mem_handle != GUNYAH_MEM_HANDLE_INVAL) { + ret = gunyah_rm_mem_reclaim(ghvm->rm, parcel); + if (ret) { + dev_err(ghvm->parent, "Failed to reclaim parcel: %d\n", + ret); + /* We can't reclaim the pages -- hold onto the pages + * forever because we don't know what state the memory + * is in + */ + return ret; + } + parcel->mem_handle = GUNYAH_MEM_HANDLE_INVAL; + + for (i = 0; i < parcel->n_mem_entries; i++) { + entry = &parcel->mem_entries[i]; + + folio = pfn_folio(PHYS_PFN(le64_to_cpu(entry->phys_addr))); + + if (folio_test_private(folio)) + gunyah_folio_host_reclaim(folio); + + folio_clear_private(folio); + folio_put(folio); /* A */ + } + + kfree(parcel->mem_entries); + kfree(parcel->acl_entries); + } + + return 0; +} diff --git a/drivers/virt/gunyah/vm_mgr.h b/drivers/virt/gunyah/vm_mgr.h index d9f101fc52632..b6bc66f018b09 100644 --- a/drivers/virt/gunyah/vm_mgr.h +++ b/drivers/virt/gunyah/vm_mgr.h @@ -181,5 +181,11 @@ int gunyah_gmem_modify_mapping(struct gunyah_vm *ghvm, struct gunyah_map_mem_args *args); struct gunyah_gmem_binding; void gunyah_gmem_remove_binding(struct gunyah_gmem_binding *binding); +int gunyah_gmem_share_parcel(struct gunyah_vm *ghvm, + struct gunyah_rm_mem_parcel *parcel, u64 *gfn, + u64 *nr); +int gunyah_gmem_reclaim_parcel(struct gunyah_vm *ghvm, + struct gunyah_rm_mem_parcel *parcel, u64 gfn, + u64 nr); #endif