[PATCH rfcv4 07/13] qemu: force special parameters enabled for TDX guest
TDX guest requires some special parameters to boot, currently:
"kernel_irqchip=split"
"pmu!=on"
"smm!=on"
"-bios"
If not specified explicitly, QEMU should configure this option implicitly
when start a TDX guest.
Signed-off-by: Zhenzhong Duan <zhenzhong.duan(a)intel.com>
---
src/qemu/qemu_validate.c | 32 ++++++++++++++++++++++++++++++++
1 file changed, 32 insertions(+)
diff --git a/src/qemu/qemu_validate.c b/src/qemu/qemu_validate.c
index db8493be68..8a3a64227e 100644
--- a/src/qemu/qemu_validate.c
+++ b/src/qemu/qemu_validate.c
@@ -1333,6 +1333,38 @@ qemuValidateDomainDef(const virDomainDef *def,
_("Only bit0(debug) and bit28(sept-ve-disable) are
supported intel TDX launch security policy"));
return -1;
}
+ if (def->features[VIR_DOMAIN_FEATURE_IOAPIC] == VIR_DOMAIN_IOAPIC_KVM) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+ _("Intel TDX launch security needs split kernel
irqchip"));
+ return -1;
+ }
+ /* Current KVM doesn't support PMU for TD guest. It returns
+ * error if TD is created with PMU bit being set in attributes.
+ * By default, QEMU disable PMU for TD guest.
+ */
+ if (def->features[VIR_DOMAIN_FEATURE_PMU] == VIR_TRISTATE_SWITCH_ON) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+ _("Intel TDX launch security is not supported with
PMU enabled"));
+ return -1;
+ }
+ /* TDX doesn't support SMM and VMM cannot emulate SMM for TDX VMs
+ * because VMM cannot manipulate TDX VM's memory.
+ * By default, QEMU disable SMM for TD guest.
+ */
+ if (def->features[VIR_DOMAIN_FEATURE_SMM] == VIR_TRISTATE_SWITCH_ON) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+ _("Intel TDX launch security is not supported with
SMM enabled"));
+ return -1;
+ }
+ /* TDVF(OVMF) needs to run at private memory for TD guest. TDX cannot
+ * support pflash device since it doesn't support read-only private
memory.
+ * Thus load TDVF(OVMF) with -bios option for TDs.
+ */
+ if (def->os.loader && def->os.loader->type ==
VIR_DOMAIN_LOADER_TYPE_PFLASH) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+ _("Intel TDX launch security is not supported with
pflash loader"));
+ return -1;
+ }
break;
case VIR_DOMAIN_LAUNCH_SECURITY_NONE:
case VIR_DOMAIN_LAUNCH_SECURITY_LAST:
--
2.34.1