Ignore vsock tests on Linux aarch64

Apparently AWS Graviton containers don't support it.  socket() retunrs
EAFNOSUPPORT in that environment.

Also, be more selective about skipping tests under QEMU

Instead of skipping them on architectures where we happen to use QEMU,
only skip them when QEMU is actually being used.

.cirrus.yml

@@ -48,6 +48,7 @@ task:
     RUST_TEST_THREADS: 1            # QEMU works best with 1 thread
     HOME: /tmp/home
     PATH: $HOME/.cargo/bin:$PATH
+    RUSTFLAGS: --cfg qemu
   matrix:
     - name: Linux arm gnueabi
       env:
@@ -94,7 +95,7 @@ task:
     - cross test --target $TARGET
   before_cache_script: rm -rf $CARGO_HOME/registry/index
 
-# Tasks for Linux amd64 builds
+# Tasks for Linux native builds
 task:
   matrix:
     - name: Rust Stable
@@ -106,6 +107,7 @@ task:
       arm_container:
         image: rust:1.46
       env:
+        RUSTFLAGS: --cfg graviton
         TARGET: aarch64-unknown-linux-gnu
     - name: Linux x86_64
       container:

Cross.toml

@@ -1,2 +1,5 @@
 [build.env]
-passthrough = ["RUST_TEST_THREADS"]
+passthrough = [
+	"RUSTFLAGS",
+	"RUST_TEST_THREADS"
+]

test/sys/test_socket.rs

@@ -288,9 +288,9 @@ mod recvfrom {
         use nix::sys::socket::sockopt::{UdpGroSegment, UdpGsoSegment};
 
         #[test]
-        // Disable the test on emulated platforms because it fails in Cirrus-CI.  Lack of QEMU
-        // support is suspected.
-        #[cfg_attr(not(any(target_arch = "x86_64", target_arch="i686")), ignore)]
+        // Disable the test under emulation because it fails in Cirrus-CI.  Lack
+        // of QEMU support is suspected.
+        #[cfg_attr(qemu, ignore)]
         pub fn gso() {
             require_kernel_version!(udp_offload::gso, ">= 4.18");
 
@@ -342,9 +342,9 @@ mod recvfrom {
         }
 
         #[test]
-        // Disable the test on emulated platforms because it fails in Cirrus-CI.  Lack of QEMU
-        // support is suspected.
-        #[cfg_attr(not(any(target_arch = "x86_64", target_arch="i686")), ignore)]
+        // Disable the test on emulated platforms because it fails in Cirrus-CI.
+        // Lack of QEMU support is suspected.
+        #[cfg_attr(qemu, ignore)]
         pub fn gro() {
             require_kernel_version!(udp_offload::gro, ">= 5.3");
 
@@ -583,7 +583,7 @@ pub fn test_recvmsg_ebadf() {
 
 // Disable the test on emulated platforms due to a bug in QEMU versions <
 // 2.12.0.  https://bugs.launchpad.net/qemu/+bug/1701808
-#[cfg_attr(not(any(target_arch = "x86_64", target_arch="i686")), ignore)]
+#[cfg_attr(qemu, ignore)]
 #[test]
 pub fn test_scm_rights() {
     use nix::sys::uio::IoVec;
@@ -637,8 +637,8 @@ pub fn test_scm_rights() {
 }
 
 // Disable the test on emulated platforms due to not enabled support of AF_ALG in QEMU from rust cross
-#[cfg_attr(not(any(target_arch = "x86_64", target_arch = "i686")), ignore)]
 #[cfg(any(target_os = "linux", target_os= "android"))]
+#[cfg_attr(qemu, ignore)]
 #[test]
 pub fn test_af_alg_cipher() {
     use libc;
@@ -705,9 +705,10 @@ pub fn test_af_alg_cipher() {
     assert_eq!(decrypted, payload);
 }
 
-// Disable the test on emulated platforms due to not enabled support of AF_ALG in QEMU from rust cross
-#[cfg_attr(not(any(target_arch = "x86_64", target_arch = "i686")), ignore)]
+// Disable the test on emulated platforms due to not enabled support of AF_ALG
+// in QEMU from rust cross
 #[cfg(any(target_os = "linux", target_os= "android"))]
+#[cfg_attr(qemu, ignore)]
 #[test]
 pub fn test_af_alg_aead() {
     use libc::{ALG_OP_DECRYPT, ALG_OP_ENCRYPT};
@@ -910,7 +911,7 @@ pub fn test_sendmsg_ipv6packetinfo() {
 /// Tests that passing multiple fds using a single `ControlMessage` works.
 // Disable the test on emulated platforms due to a bug in QEMU versions <
 // 2.12.0.  https://bugs.launchpad.net/qemu/+bug/1701808
-#[cfg_attr(not(any(target_arch = "x86_64", target_arch="i686")), ignore)]
+#[cfg_attr(qemu, ignore)]
 #[test]
 fn test_scm_rights_single_cmsg_multiple_fds() {
     use std::os::unix::net::UnixDatagram;
@@ -1057,9 +1058,9 @@ fn test_scm_credentials() {
 /// Ensure that we can send `SCM_CREDENTIALS` and `SCM_RIGHTS` with a single
 /// `sendmsg` call.
 #[cfg(any(target_os = "android", target_os = "linux"))]
-// qemu's handling of multiple cmsgs is bugged, ignore tests on non-x86
+// qemu's handling of multiple cmsgs is bugged, ignore tests under emulation
 // see https://bugs.launchpad.net/qemu/+bug/1781280
-#[cfg_attr(not(any(target_arch = "x86_64", target_arch = "x86")), ignore)]
+#[cfg_attr(qemu, ignore)]
 #[test]
 fn test_scm_credentials_and_rights() {
     use libc;
@@ -1071,9 +1072,9 @@ fn test_scm_credentials_and_rights() {
 /// Ensure that passing a an oversized control message buffer to recvmsg
 /// still works.
 #[cfg(any(target_os = "android", target_os = "linux"))]
-// qemu's handling of multiple cmsgs is bugged, ignore tests on non-x86
+// qemu's handling of multiple cmsgs is bugged, ignore tests under emulation
 // see https://bugs.launchpad.net/qemu/+bug/1781280
-#[cfg_attr(not(any(target_arch = "x86_64", target_arch = "x86")), ignore)]
+#[cfg_attr(qemu, ignore)]
 #[test]
 fn test_too_large_cmsgspace() {
     let space = vec![0u8; 1024];
@@ -1262,10 +1263,13 @@ fn loopback_address(family: AddressFamily) -> Option<nix::ifaddrs::InterfaceAddr
     target_os = "netbsd",
 ))]
 // qemu doesn't seem to be emulating this correctly in these architectures
-#[cfg_attr(any(
-    target_arch = "mips",
-    target_arch = "mips64",
-    target_arch = "powerpc64",
+#[cfg_attr(all(
+    qemu,
+    any(
+        target_arch = "mips",
+        target_arch = "mips64",
+        target_arch = "powerpc64",
+    )
 ), ignore)]
 #[test]
 pub fn test_recv_ipv4pktinfo() {
@@ -1352,10 +1356,13 @@ pub fn test_recv_ipv4pktinfo() {
     target_os = "openbsd",
 ))]
 // qemu doesn't seem to be emulating this correctly in these architectures
-#[cfg_attr(any(
-    target_arch = "mips",
-    target_arch = "mips64",
-    target_arch = "powerpc64",
+#[cfg_attr(all(
+    qemu,
+    any(
+        target_arch = "mips",
+        target_arch = "mips64",
+        target_arch = "powerpc64",
+    )
 ), ignore)]
 #[test]
 pub fn test_recvif() {
@@ -1463,10 +1470,13 @@ pub fn test_recvif() {
     target_os = "openbsd",
 ))]
 // qemu doesn't seem to be emulating this correctly in these architectures
-#[cfg_attr(any(
-    target_arch = "mips",
-    target_arch = "mips64",
-    target_arch = "powerpc64",
+#[cfg_attr(all(
+    qemu,
+    any(
+        target_arch = "mips",
+        target_arch = "mips64",
+        target_arch = "powerpc64",
+    )
 ), ignore)]
 #[test]
 pub fn test_recv_ipv6pktinfo() {
@@ -1544,6 +1554,7 @@ pub fn test_recv_ipv6pktinfo() {
 }
 
 #[cfg(any(target_os = "android", target_os = "linux"))]
+#[cfg_attr(graviton, ignore = "Not supported by the CI environment")]
 #[test]
 pub fn test_vsock() {
     use libc;
@@ -1588,9 +1599,9 @@ pub fn test_vsock() {
     thr.join().unwrap();
 }
 
-// Disable the test on emulated platforms because it fails in Cirrus-CI.  Lack of QEMU
-// support is suspected.
-#[cfg_attr(not(any(target_arch = "x86_64")), ignore)]
+// Disable the test on emulated platforms because it fails in Cirrus-CI.  Lack
+// of QEMU support is suspected.
+#[cfg_attr(qemu, ignore)]
 #[cfg(all(target_os = "linux"))]
 #[test]
 fn test_recvmsg_timestampns() {
@@ -1639,9 +1650,9 @@ fn test_recvmsg_timestampns() {
     nix::unistd::close(in_socket).unwrap();
 }
 
-// Disable the test on emulated platforms because it fails in Cirrus-CI.  Lack of QEMU
-// support is suspected.
-#[cfg_attr(not(any(target_arch = "x86_64")), ignore)]
+// Disable the test on emulated platforms because it fails in Cirrus-CI.  Lack
+// of QEMU support is suspected.
+#[cfg_attr(qemu, ignore)]
 #[cfg(all(target_os = "linux"))]
 #[test]
 fn test_recvmmsg_timestampns() {
@@ -1696,9 +1707,9 @@ fn test_recvmmsg_timestampns() {
     nix::unistd::close(in_socket).unwrap();
 }
 
-// Disable the test on emulated platforms because it fails in Cirrus-CI.  Lack of QEMU
-// support is suspected.
-#[cfg_attr(not(any(target_arch = "x86_64")), ignore)]
+// Disable the test on emulated platforms because it fails in Cirrus-CI.  Lack
+// of QEMU support is suspected.
+#[cfg_attr(qemu, ignore)]
 #[cfg(any(target_os = "android", target_os = "fuchsia", target_os = "linux"))]
 #[test]
 fn test_recvmsg_rxq_ovfl() {

test/sys/test_uio.rs

@@ -205,8 +205,8 @@ fn test_preadv() {
 
 #[test]
 #[cfg(target_os = "linux")]
-// FIXME: qemu-user doesn't implement process_vm_readv/writev on most arches
-#[cfg_attr(not(any(target_arch = "x86", target_arch = "x86_64")), ignore)]
+// qemu-user doesn't implement process_vm_readv/writev on most arches
+#[cfg_attr(qemu, ignore)]
 fn test_process_vm_readv() {
     use nix::unistd::ForkResult::*;
     use nix::sys::signal::*;

test/test_fcntl.rs

@@ -236,14 +236,8 @@ mod linux_android {
     /// The from_offset should be updated by the call to reflect
     /// the 3 bytes read (6).
     #[test]
-    // QEMU does not support copy_file_range. Skip platforms that use QEMU in CI
-    #[cfg_attr(all(target_os = "linux", any(
-            target_arch = "aarch64",
-            target_arch = "arm",
-            target_arch = "mips",
-            target_arch = "mips64",
-            target_arch = "powerpc64"
-    )), ignore)]
+    // QEMU does not support copy_file_range. Skip under qemu
+    #[cfg_attr(qemu, ignore)]
     fn test_copy_file_range() {
         const CONTENTS: &[u8] = b"foobarbaz";
 

test/test_mq.rs

@@ -60,7 +60,11 @@ fn test_mq_getattr() {
 // FIXME: Fix failures for mips in QEMU
 #[test]
 #[cfg(not(any(target_os = "netbsd")))]
-#[cfg_attr(any(target_arch = "mips", target_arch = "mips64"), ignore)]
+#[cfg_attr(all(
+        qemu,
+        any(target_arch = "mips", target_arch = "mips64")
+    ), ignore
+)]
 fn test_mq_setattr() {
     use nix::mqueue::{mq_getattr, mq_setattr};
     const MSG_SIZE: mq_attr_member_t = 32;
@@ -97,7 +101,11 @@ fn test_mq_setattr() {
 // FIXME: Fix failures for mips in QEMU
 #[test]
 #[cfg(not(any(target_os = "netbsd")))]
-#[cfg_attr(any(target_arch = "mips", target_arch = "mips64"), ignore)]
+#[cfg_attr(all(
+        qemu,
+        any(target_arch = "mips", target_arch = "mips64")
+    ), ignore
+)]
 fn test_mq_set_nonblocking() {
     use nix::mqueue::{mq_getattr, mq_set_nonblock, mq_remove_nonblock};
     const MSG_SIZE: mq_attr_member_t = 32;