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test-runner: Fix the has_virt flag usage

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Use the same machine type regardless of has_virt: q35 with accelerators
list set to kvm:tcg, this will use KVM if available and fall back to TCG
if not available so there's no point checking has_virt.  We can't
reliably know if KVM is usable anyway: even if the CPU has the
virtualization extensions, the support might not be enabled in the QEMU
build or there may be no kernel module or we may be calling a different
qemu executable than the one supporting KVM.

Set CPU type to "host" if KVM available and "max" otherwise because
"host" is not supported without KVM.  We actually want to emulate the
host CPU as closely as possible so that host executables can run even if
optimized for the specific CPU.  "max" seems to be the new way (since
Feb only) to request "host" cpu without KVM.  It seems that the idea is
for "max" to become same as "host" if KVM is enabled so at some point we
will want to switch to using "max" in both cases.

The "level=9" flag seems to have been an error, there's no CPU with
cpuid max level of 9 and I can't see the purpose of setting the cpuid
level other than the host cpu's level.

-enable-kvm is redundant with accel=kvm:tcg in current qemu.

Again I'm not able to test this patch on a cpu that would be affected
by it but I hope this fixes some situations which are currently broken
anyway.
This commit is contained in:
Andrew Zaborowski 2017-05-14 04:40:23 +02:00 committed by Denis Kenzior
parent a74c34024a
commit 7b45ad220d
1 changed files with 3 additions and 12 deletions
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15
tools/test-runner.c
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@ -213,7 +213,7 @@ static void prepare_sandbox(void)
static char *const qemu_argv[] = {
"",
"-machine", "",
"-machine", "type=q35,accel=kvm:tcg",
"-nodefaults",
"-nodefconfig",
"-no-user-config",
@ -315,21 +315,12 @@ static void start_qemu(void)
argv[0] = (char *) qemu_binary;
if (has_virt)
argv[2] = "type=q35,accel=kvm:tcg";
else
argv[2] = "type=q35";
argv[pos++] = "-kernel";
argv[pos++] = (char *) kernel_image;
argv[pos++] = "-append";
argv[pos++] = (char *) cmdline;
if (has_virt) {
argv[pos++] = "-cpu";
argv[pos++] = "host,level=9";
argv[pos++] = "-enable-kvm";
}
argv[pos++] = "-cpu";
argv[pos++] = has_virt ? "host" : "max";
argv[pos] = NULL;