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[PATCH v2] libqtest: refuse QTEST_QEMU_BINARY=qemu-kvm

From: Stefan Hajnoczi
Subject: [PATCH v2] libqtest: refuse QTEST_QEMU_BINARY=qemu-kvm
Date: Mon, 12 Apr 2021 10:18:24 +0100

Some downstreams rename the QEMU binary to "qemu-kvm". This breaks
qtest_get_arch(), which attempts to parse the target architecture from
the QTEST_QEMU_BINARY environment variable.

Print an error instead of returning the architecture "kvm". Things fail
in weird ways when the architecture string is bogus.

Arguably qtests should always be run in a build directory instead of
against an installed QEMU. In any case, printing a clear error when this
happens is helpful.

Reported-by: Qin Wang <qinwang@rehdat.com>
Cc: Emanuele Giuseppe Esposito <eesposit@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
 tests/qtest/libqtest.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/tests/qtest/libqtest.c b/tests/qtest/libqtest.c
index 71e359efcd..7caf20f56b 100644
--- a/tests/qtest/libqtest.c
+++ b/tests/qtest/libqtest.c
@@ -910,6 +910,16 @@ const char *qtest_get_arch(void)
+    if (!strstr(qemu, "-system-")) {
+        fprintf(stderr, "QTEST_QEMU_BINARY must end with *-system-<arch> where 
+                        "'arch' is the target architecture (x86_64, aarch64, "
+                        "etc). If you are using qemu-kvm or another custom "
+                        "name, please create a symlink like ln -s "
+                        "path/to/qemu-kvm qemu-system-x86_64 and use that "
+                        "instead.\n");
+        abort();
+    }
     return end + 1;

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