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target/i386: Implement mc->kvm_type() to get VM type

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KVM is introducing a new API to create confidential guests, which
will be used by TDX and SEV-SNP but is also available for SEV and
SEV-ES.  The API uses the VM type argument to KVM_CREATE_VM to
identify which confidential computing technology to use.

Since there are no other expected uses of VM types, delegate
mc->kvm_type() for x86 boards to the confidential-guest-support
object pointed to by ms->cgs.

For example, if a sev-guest object is specified to confidential-guest-support,
like,

  qemu -machine ...,confidential-guest-support=sev0 \
       -object sev-guest,id=sev0,...

it will check if a VM type KVM_X86_SEV_VM or KVM_X86_SEV_ES_VM
is supported, and if so use them together with the KVM_SEV_INIT2
function of the KVM_MEMORY_ENCRYPT_OP ioctl. If not, it will fall back to
KVM_SEV_INIT and KVM_SEV_ES_INIT.

This is a preparatory work towards TDX and SEV-SNP support, but it
will also enable support for VMSA features such as DebugSwap, which
are only available via KVM_SEV_INIT2.

Co-developed-by: Xiaoyao Li <xiaoyao.li@intel.com>
Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2024-03-19 15:29:33 +01:00
parent d82e9c843d
commit ee88612df1
4 changed files with 76 additions and 0 deletions
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11
hw/i386/x86.c
View file

@ -1381,6 +1381,16 @@ static void machine_set_sgx_epc(Object *obj, Visitor *v, const char *name,
qapi_free_SgxEPCList(list);
}
static int x86_kvm_type(MachineState *ms, const char *vm_type)
{
/*
* No x86 machine has a kvm-type property. If one is added that has
* it, it should call kvm_get_vm_type() directly or not use it at all.
*/
assert(vm_type == NULL);
return kvm_enabled() ? kvm_get_vm_type(ms) : 0;
}
static void x86_machine_initfn(Object *obj)
{
X86MachineState *x86ms = X86_MACHINE(obj);
@ -1405,6 +1415,7 @@ static void x86_machine_class_init(ObjectClass *oc, void *data)
mc->cpu_index_to_instance_props = x86_cpu_index_to_props;
mc->get_default_cpu_node_id = x86_get_default_cpu_node_id;
mc->possible_cpu_arch_ids = x86_possible_cpu_arch_ids;
mc->kvm_type = x86_kvm_type;
x86mc->save_tsc_khz = true;
x86mc->fwcfg_dma_enabled = true;
nc->nmi_monitor_handler = x86_nmi;