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tools: Secure guest check on s390 in virt-host-validate

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Add checking in virt-host-validate for secure guest support
on s390 for IBM Secure Execution.

Signed-off-by: Boris Fiuczynski <fiuczy@linux.ibm.com>
Tested-by: Viktor Mihajlovski <mihajlov@linux.ibm.com>
Reviewed-by: Paulo de Rezende Pinatti <ppinatti@linux.ibm.com>
Reviewed-by: Bjoern Walk <bwalk@linux.ibm.com>
Reviewed-by: Erik Skultety <eskultet@redhat.com>
This commit is contained in:
Boris Fiuczynski 2020-06-15 10:28:09 +02:00 committed by Erik Skultety
parent 657365e74f
commit 0254ceab82
3 changed files with 70 additions and 2 deletions
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64
tools/virt-host-validate-common.c
View File

@ -40,7 +40,8 @@ VIR_ENUM_IMPL(virHostValidateCPUFlag,
VIR_HOST_VALIDATE_CPU_FLAG_LAST,
"vmx",
"svm",
"sie");
"sie",
"158");
static bool quiet;
@ -210,7 +211,8 @@ virBitmapPtr virHostValidateGetCPUFlags(void)
* on the architecture, so check possible prefixes */
if (!STRPREFIX(line, "flags") &&
!STRPREFIX(line, "Features") &&
!STRPREFIX(line, "features"))
!STRPREFIX(line, "features") &&
!STRPREFIX(line, "facilities"))
continue;
/* fgets() includes the trailing newline in the output buffer,
@ -439,3 +441,61 @@ bool virHostKernelModuleIsLoaded(const char *module)
return ret;
}
int virHostValidateSecureGuests(const char *hvname,
virHostValidateLevel level)
{
virBitmapPtr flags;
bool hasFac158 = false;
virArch arch = virArchFromHost();
g_autofree char *cmdline = NULL;
static const char *kIBMValues[] = {"y", "Y", "on", "ON", "oN", "On", "1"};
flags = virHostValidateGetCPUFlags();
if (flags && virBitmapIsBitSet(flags, VIR_HOST_VALIDATE_CPU_FLAG_FACILITY_158))
hasFac158 = true;
virBitmapFree(flags);
virHostMsgCheck(hvname, "%s", _("for secure guest support"));
if (ARCH_IS_S390(arch)) {
if (hasFac158) {
if (!virFileIsDir("/sys/firmware/uv")) {
virHostMsgFail(level, "IBM Secure Execution not supported by "
"the currently used kernel");
return 0;
}
if (virFileReadValueString(&cmdline, "/proc/cmdline") < 0)
return -1;
/* 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,
G_N_ELEMENTS(kIBMValues),
VIR_KERNEL_CMDLINE_FLAGS_SEARCH_FIRST |
VIR_KERNEL_CMDLINE_FLAGS_CMP_PREFIX)) {
virHostMsgPass();
return 1;
} else {
virHostMsgFail(level,
"IBM Secure Execution appears to be disabled "
"in kernel. Add prot_virt=1 to kernel cmdline "
"arguments");
}
} else {
virHostMsgFail(level, "Hardware or firmware does not provide "
"support for IBM Secure Execution");
}
} else {
virHostMsgFail(level,
"Unknown if this platform has Secure Guest support");
return -1;
}
return 0;
}

4
tools/virt-host-validate-common.h
View File

@ -37,6 +37,7 @@ typedef enum {
VIR_HOST_VALIDATE_CPU_FLAG_VMX = 0,
VIR_HOST_VALIDATE_CPU_FLAG_SVM,
VIR_HOST_VALIDATE_CPU_FLAG_SIE,
VIR_HOST_VALIDATE_CPU_FLAG_FACILITY_158,
VIR_HOST_VALIDATE_CPU_FLAG_LAST,
} virHostValidateCPUFlag;
@ -83,4 +84,7 @@ int virHostValidateCGroupControllers(const char *hvname,
int virHostValidateIOMMU(const char *hvname,
virHostValidateLevel level);
int virHostValidateSecureGuests(const char *hvname,
virHostValidateLevel level);
bool virHostKernelModuleIsLoaded(const char *module);

4
tools/virt-host-validate-qemu.c
View File

@ -127,5 +127,9 @@ int virHostValidateQEMU(void)
VIR_HOST_VALIDATE_WARN) < 0)
ret = -1;
if (virHostValidateSecureGuests("QEMU",
VIR_HOST_VALIDATE_WARN) < 0)
ret = -1;
return ret;
}