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| author | Jakub Staron <jstaron@google.com> | 2019-04-24 10:55:25 -0700 |
|---|---|---|
| committer | Commit Bot <commit-bot@chromium.org> | 2019-06-05 07:28:54 +0000 |
| commit | a3411eaac1ad3d51d5282d1462d6764ad539ce13 (patch) | |
| tree | 7a9898280f1cd8c78dcdfac6893189ed42419d76 /sys_util | |
| parent | 127453d7eccdb6a903d0855fabb8f0935be90882 (diff) | |
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crosvm: virtio-pmem device
Adds support for virtio-pmem device as an alternative for virtio-blk. Exposing disk image to guest as virtio-blk device results in both guest and host independently caching the disk I/O. Using virtio-pmem device allows to mount disk image as direct access (DAX) in the guest and thus bypass the guest cache. This will reduce memory foodprint of the VMs. BUG=None TEST=cargo test TEST=Boot patched termina kernel in crosvm; mount virtio-pmem device as DAX and run xfstests. Change-Id: I935fc8fc7527f79e5169f07ec7927e4ea4fa6027 Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/1605517 Tested-by: kokoro <noreply+kokoro@google.com> Reviewed-by: Zach Reizner <zachr@chromium.org> Commit-Queue: Jakub StaroĊ <jstaron@google.com>
Diffstat (limited to 'sys_util')
| -rw-r--r-- | sys_util/src/mmap.rs | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/sys_util/src/mmap.rs b/sys_util/src/mmap.rs index 9f573e4..3d1e577 100644 --- a/sys_util/src/mmap.rs +++ b/sys_util/src/mmap.rs @@ -82,6 +82,12 @@ impl Protection { Protection(libc::PROT_READ | libc::PROT_WRITE) } + /// Returns Protection allowing read access. + #[inline(always)] + pub fn read() -> Protection { + Protection(libc::PROT_READ) + } + /// Set read events. #[inline(always)] pub fn set_read(self) -> Protection { |