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44a7e0aaf7
It is possible to start QEMU with a confidential-guest-support object
even in TCG mode. While there is already a check in qemu_machine_creation_done:
if (machine->cgs && !machine->cgs->ready) {
error_setg(errp, "accelerator does not support confidential guest %s",
object_get_typename(OBJECT(machine->cgs)));
exit(1);
}
the creation of RAMBlocks happens earlier, in qemu_init_board(), if
the command line does not override the default memory backend with
-M memdev. Then the RAMBlock will try to use guest_memfd (because
machine_require_guest_memfd correctly returns true; at least correctly
according to the current implementation) and trigger the assertion
failure for kvm_enabled(). This happend with a command line as
simple as the following:
qemu-system-x86_64 -m 512 -nographic -object sev-snp-guest,reduced-phys-bits=48,id=sev0 \
-M q35,kernel-irqchip=split,confidential-guest-support=sev0
qemu-system-x86_64: ../system/physmem.c:1871: ram_block_add: Assertion `kvm_enabled()' failed.
Cc: Xiaoyao Li <xiaoyao.li@intel.com>
Cc: qemu-stable@nongnu.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Pankaj Gupta <pankaj.gupta@amd.com>
Reviewed-by: Xiaoyao Li <xiaoyao.li@intel.com>
Link: https://lore.kernel.org/r/20250217120812.396522-1-pbonzini@redhat.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
(cherry picked from commit
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| .. | ||
| arch_init.c | ||
| async-teardown.c | ||
| balloon.c | ||
| bootdevice.c | ||
| cpu-timers.c | ||
| cpus.c | ||
| datadir.c | ||
| device_tree-stub.c | ||
| device_tree.c | ||
| dirtylimit.c | ||
| dma-helpers.c | ||
| globals.c | ||
| ioport.c | ||
| main.c | ||
| memory.c | ||
| memory_ldst.c.inc | ||
| memory_mapping.c | ||
| meson.build | ||
| physmem.c | ||
| qdev-monitor.c | ||
| qemu-seccomp.c | ||
| qtest.c | ||
| rtc.c | ||
| runstate-action.c | ||
| runstate-hmp-cmds.c | ||
| runstate.c | ||
| tpm-hmp-cmds.c | ||
| tpm.c | ||
| trace-events | ||
| trace.h | ||
| vl.c | ||
| watchpoint.c | ||