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vm-virtio: Implement multi-mapping for virtio-fs

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The virtio-fs messages coming from the slave can contain multiple
mappings (up to 8) through one single request. By implementing such
feature, the virtio-fs implementation of cloud-hypervisor is optimal and
fully functional as it resolves a bug that was seen when running fio
testing without this patch.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
This commit is contained in:
Sebastien Boeuf 2020-01-07 17:18:02 +01:00
parent 143471b739
commit 84445aae93
2 changed files with 78 additions and 42 deletions
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2
vhost_rs/src/vhost_user/message.rs
View File

@ -631,7 +631,7 @@ bitflags! {
}
/// Max entries in one virtio-fs slave request.
const VHOST_USER_FS_SLAVE_ENTRIES: usize = 8;
pub const VHOST_USER_FS_SLAVE_ENTRIES: usize = 8;
/// Slave request message to update the MMIO window.
#[repr(packed)]

118
vm-virtio/src/vhost_user/fs.rs
View File

@ -21,6 +21,7 @@ use std::sync::{Arc, Mutex};
use std::thread;
use vhost_rs::vhost_user::message::{
VhostUserFSSlaveMsg, VhostUserProtocolFeatures, VhostUserVirtioFeatures,
VHOST_USER_FS_SLAVE_ENTRIES,
};
use vhost_rs::vhost_user::{
HandlerResult, Master, MasterReqHandler, VhostUserMaster, VhostUserMasterReqHandler,
@ -49,24 +50,35 @@ impl VhostUserMasterReqHandler for SlaveReqHandler {
fn fs_slave_map(&mut self, fs: &VhostUserFSSlaveMsg, fd: RawFd) -> HandlerResult<()> {
debug!("fs_slave_map");
let addr = self.mmap_cache_addr + fs.cache_offset[0];
let ret = unsafe {
libc::mmap(
addr as *mut libc::c_void,
fs.len[0] as usize,
fs.flags[0].bits() as i32,
libc::MAP_SHARED | libc::MAP_FIXED,
fd,
fs.fd_offset[0] as libc::off_t,
)
};
if ret == libc::MAP_FAILED {
return Err(io::Error::last_os_error());
}
for i in 0..VHOST_USER_FS_SLAVE_ENTRIES {
// Ignore if the length is 0.
if fs.len[i] == 0 {
continue;
}
let ret = unsafe { libc::close(fd) };
if ret == -1 {
return Err(io::Error::last_os_error());
if fs.cache_offset[i] > self.cache_size {
return Err(io::Error::new(io::ErrorKind::Other, "Wrong offset"));
}
let addr = self.mmap_cache_addr + fs.cache_offset[i];
let ret = unsafe {
libc::mmap(
addr as *mut libc::c_void,
fs.len[i] as usize,
fs.flags[i].bits() as i32,
libc::MAP_SHARED | libc::MAP_FIXED,
fd,
fs.fd_offset[i] as libc::off_t,
)
};
if ret == libc::MAP_FAILED {
return Err(io::Error::last_os_error());
}
let ret = unsafe { libc::close(fd) };
if ret == -1 {
return Err(io::Error::last_os_error());
}
}
Ok(())
@ -75,26 +87,38 @@ impl VhostUserMasterReqHandler for SlaveReqHandler {
fn fs_slave_unmap(&mut self, fs: &VhostUserFSSlaveMsg) -> HandlerResult<()> {
debug!("fs_slave_unmap");
let mut len = fs.len[0];
// Need to handle a special case where the slave ask for the unmapping
// of the entire mapping.
if len == 0xffff_ffff_ffff_ffff {
len = self.cache_size;
}
for i in 0..VHOST_USER_FS_SLAVE_ENTRIES {
let mut len = fs.len[i];
let addr = self.mmap_cache_addr + fs.cache_offset[0];
let ret = unsafe {
libc::mmap(
addr as *mut libc::c_void,
len as usize,
libc::PROT_NONE,
libc::MAP_ANONYMOUS | libc::MAP_PRIVATE | libc::MAP_FIXED,
-1,
0 as libc::off_t,
)
};
if ret == libc::MAP_FAILED {
return Err(io::Error::last_os_error());
// Ignore if the length is 0.
if len == 0 {
continue;
}
// Need to handle a special case where the slave ask for the unmapping
// of the entire mapping.
if len == 0xffff_ffff_ffff_ffff {
len = self.cache_size;
}
if fs.cache_offset[i] > self.cache_size {
return Err(io::Error::new(io::ErrorKind::Other, "Wrong offset"));
}
let addr = self.mmap_cache_addr + fs.cache_offset[i];
let ret = unsafe {
libc::mmap(
addr as *mut libc::c_void,
len as usize,
libc::PROT_NONE,
libc::MAP_ANONYMOUS | libc::MAP_PRIVATE | libc::MAP_FIXED,
-1,
0 as libc::off_t,
)
};
if ret == libc::MAP_FAILED {
return Err(io::Error::last_os_error());
}
}
Ok(())
@ -103,11 +127,23 @@ impl VhostUserMasterReqHandler for SlaveReqHandler {
fn fs_slave_sync(&mut self, fs: &VhostUserFSSlaveMsg) -> HandlerResult<()> {
debug!("fs_slave_sync");
let addr = self.mmap_cache_addr + fs.cache_offset[0];
let ret =
unsafe { libc::msync(addr as *mut libc::c_void, fs.len[0] as usize, libc::MS_SYNC) };
if ret == -1 {
return Err(io::Error::last_os_error());
for i in 0..VHOST_USER_FS_SLAVE_ENTRIES {
// Ignore if the length is 0.
if fs.len[i] == 0 {
continue;
}
if fs.cache_offset[i] > self.cache_size {
return Err(io::Error::new(io::ErrorKind::Other, "Wrong offset"));
}
let addr = self.mmap_cache_addr + fs.cache_offset[i];
let ret = unsafe {
libc::msync(addr as *mut libc::c_void, fs.len[i] as usize, libc::MS_SYNC)
};
if ret == -1 {
return Err(io::Error::last_os_error());
}
}
Ok(())