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vmm: Support configurable huge pages in MemoryManager

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Use the newly added hugepages_size option if provided by the user to
pick a huge page size when creating the memfd region. If none is
specified use the system default.

Sadly different huge pages cannot be tested by an integration test as
creating a pool of the non-default size cannot be done at runtime
(requires kernel to be booted with certain parameters.)

TETS=Manually tested with a kernel booted with both 1GiB and 2MiB huge
pages (hugepagesz=1G hugepages=1 hugepagesz=2M hugepages=512)

Fixes: #2230

Signed-off-by: Rob Bradford <robert.bradford@intel.com>
This commit is contained in:
Rob Bradford 2021-02-04 16:50:37 +00:00
parent b5fb744828
commit 7928a697dc
1 changed files with 23 additions and 1 deletions
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24
vmm/src/memory_manager.rs
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@ -131,6 +131,7 @@ pub struct MemoryManager {
snapshot: Mutex<Option<GuestMemoryLoadGuard<GuestMemoryMmap>>>,
shared: bool,
hugepages: bool,
hugepage_size: Option<u64>,
#[cfg(target_arch = "x86_64")]
sgx_epc_region: Option<SgxEpcRegion>,
user_provided_zones: bool,
@ -426,6 +427,7 @@ impl MemoryManager {
prefault,
zone.shared,
zone.hugepages,
zone.hugepage_size,
zone.host_numa_node,
)?;
@ -679,6 +681,7 @@ impl MemoryManager {
false,
zone.shared,
zone.hugepages,
zone.hugepage_size,
zone.host_numa_node,
)?;
@ -756,6 +759,7 @@ impl MemoryManager {
snapshot: Mutex::new(None),
shared: config.shared,
hugepages: config.hugepages,
hugepage_size: config.hugepage_size,
#[cfg(target_arch = "x86_64")]
sgx_epc_region: None,
user_provided_zones,
@ -928,6 +932,7 @@ impl MemoryManager {
prefault: bool,
shared: bool,
hugepages: bool,
hugepage_size: Option<u64>,
host_numa_node: Option<u32>,
) -> Result<Arc<GuestRegionMmap>, Error> {
let (f, f_off) = match backing_file {
@ -962,7 +967,23 @@ impl MemoryManager {
let fd = Self::memfd_create(
&ffi::CString::new("ch_ram").unwrap(),
if hugepages {
libc::MFD_HUGETLB | libc::MAP_HUGE_2MB as u32
libc::MFD_HUGETLB
| if let Some(hugepage_size) = hugepage_size {
/*
* From the Linux kernel:
* Several system calls take a flag to request "hugetlb" huge pages.
* Without further specification, these system calls will use the
* system's default huge page size. If a system supports multiple
* huge page sizes, the desired huge page size can be specified in
* bits [26:31] of the flag arguments. The value in these 6 bits
* will encode the log2 of the huge page size.
*/
hugepage_size.trailing_zeros() << 26
} else {
// Use the system default huge page size
0
}
} else {
0
},
@ -1100,6 +1121,7 @@ impl MemoryManager {
false,
self.shared,
self.hugepages,
self.hugepage_size,
None,
)?;