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virt-host-validate: Turn failure to read /proc/cmdline into an error

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When validating secure guests support on s390(x) we may read
/proc/cmdline and look for "prot_virt" argument. Reading the
kernel command line is done via virFileReadValueString() which
may fail. In such case caller won't see any error message. But we
can produce the same warning/error as if "prot_virt" argument
wasn't found.  Not only this lets users know about the problem,
it also terminates the "Checking for ...." line correctly.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
Reviewed-by: Fabiano Fidêncio <fabiano@fidencio.org>
This commit is contained in:
Michal Privoznik 2021-06-08 09:21:27 +02:00
parent 52d2571b58
commit 7ea5a80dc1
1 changed files with 2 additions and 4 deletions
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6
tools/virt-host-validate-common.c
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@ -470,14 +470,12 @@ int virHostValidateSecureGuests(const char *hvname,
return 0;
}
if (virFileReadValueString(&cmdline, "/proc/cmdline") < 0)
return VIR_HOST_VALIDATE_FAILURE(level);
/* we're prefix matching rather than equality matching here, because
* kernel would treat even something like prot_virt='yFOO' as
* enabled
*/
if (virKernelCmdlineMatchParam(cmdline, "prot_virt", kIBMValues,
if (virFileReadValueString(&cmdline, "/proc/cmdline") >= 0 &&
virKernelCmdlineMatchParam(cmdline, "prot_virt", kIBMValues,
G_N_ELEMENTS(kIBMValues),
VIR_KERNEL_CMDLINE_FLAGS_SEARCH_FIRST |
VIR_KERNEL_CMDLINE_FLAGS_CMP_PREFIX)) {