1 // Copyright 2020 The ChromiumOS Authors
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 use std::fs::OpenOptions;
6
7 use anyhow::bail;
8 use anyhow::Context;
9 use anyhow::Result;
10 use base::MemoryMappingBuilder;
11 use hypervisor::MemCacheType;
12 use hypervisor::Vm;
13 use resources::AddressRange;
14 use vm_memory::GuestAddress;
15
16 use crate::Pstore;
17
18 mod sys;
19
20 pub struct RamoopsRegion {
21 pub address: u64,
22 pub size: u32,
23 }
24
25 /// Creates a mmio memory region for pstore.
create_memory_region( vm: &mut impl Vm, region: AddressRange, pstore: &Pstore, ) -> Result<RamoopsRegion>26 pub fn create_memory_region(
27 vm: &mut impl Vm,
28 region: AddressRange,
29 pstore: &Pstore,
30 ) -> Result<RamoopsRegion> {
31 let region_size = region.len().context("failed to get region len")?;
32 if region_size < pstore.size.into() {
33 bail!("insufficient space for pstore {} {}", region, pstore.size);
34 }
35
36 let mut open_opts = OpenOptions::new();
37 open_opts.read(true).write(true).create(true);
38 sys::set_extra_open_opts(&mut open_opts);
39
40 let file = open_opts
41 .open(&pstore.path)
42 .context("failed to open pstore")?;
43 file.set_len(pstore.size as u64)
44 .context("failed to set pstore length")?;
45
46 let memory_mapping = MemoryMappingBuilder::new(pstore.size as usize)
47 .from_file(&file)
48 .build()
49 .context("failed to mmap pstore")?;
50
51 vm.add_memory_region(
52 GuestAddress(region.start),
53 Box::new(memory_mapping),
54 false,
55 false,
56 MemCacheType::CacheCoherent,
57 )
58 .context("failed to add pstore region")?;
59
60 Ok(RamoopsRegion {
61 address: region.start,
62 size: pstore.size,
63 })
64 }
65
add_ramoops_kernel_cmdline( cmdline: &mut kernel_cmdline::Cmdline, ramoops_region: &RamoopsRegion, ) -> std::result::Result<(), kernel_cmdline::Error>66 pub fn add_ramoops_kernel_cmdline(
67 cmdline: &mut kernel_cmdline::Cmdline,
68 ramoops_region: &RamoopsRegion,
69 ) -> std::result::Result<(), kernel_cmdline::Error> {
70 // It seems that default record_size is only 4096 byte even if crosvm allocates
71 // more memory. It means that one crash can only 4096 byte.
72 // Set record_size and console_size to 1/4 of allocated memory size.
73 // This configulation is same as the host.
74 let ramoops_opts = [
75 ("mem_address", ramoops_region.address),
76 ("mem_size", ramoops_region.size as u64),
77 ];
78 for (name, val) in &ramoops_opts {
79 cmdline.insert_str(format!("ramoops.{}={:#x}", name, val))?;
80 }
81 Ok(())
82 }
83