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qapi/qom,target/i386: sev-guest: Introduce kernel-hashes=on|off option

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Introduce new boolean 'kernel-hashes' option on the sev-guest object.
It will be used to to decide whether to add the hashes of
kernel/initrd/cmdline to SEV guest memory when booting with -kernel.
The default value is 'off'.

Signed-off-by: Dov Murik <dovmurik@linux.ibm.com>
Acked-by: Brijesh Singh <brijesh.singh@amd.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
This commit is contained in:
Dov Murik 2021-11-11 10:00:43 +00:00 committed by Daniel P. Berrangé
parent 0055ecca84
commit 55cdf56641
3 changed files with 31 additions and 2 deletions
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7
qapi/qom.json
View file

@ -769,6 +769,10 @@
# @reduced-phys-bits: number of bits in physical addresses that become
# unavailable when SEV is enabled
#
# @kernel-hashes: if true, add hashes of kernel/initrd/cmdline to a
# designated guest firmware page for measured boot
# with -kernel (default: false) (since 6.2)
#
# Since: 2.12
##
{ 'struct': 'SevGuestProperties',
@ -778,7 +782,8 @@
'*policy': 'uint32',
'*handle': 'uint32',
'*cbitpos': 'uint32',
'reduced-phys-bits': 'uint32' } }
'reduced-phys-bits': 'uint32',
'*kernel-hashes': 'bool' } }
##
# @ObjectType:

6
qemu-options.hx
View file

@ -5189,7 +5189,7 @@ SRST
-object secret,id=sec0,keyid=secmaster0,format=base64,\\
data=$SECRET,iv=$(<iv.b64)
``-object sev-guest,id=id,cbitpos=cbitpos,reduced-phys-bits=val,[sev-device=string,policy=policy,handle=handle,dh-cert-file=file,session-file=file]``
``-object sev-guest,id=id,cbitpos=cbitpos,reduced-phys-bits=val,[sev-device=string,policy=policy,handle=handle,dh-cert-file=file,session-file=file,kernel-hashes=on|off]``
Create a Secure Encrypted Virtualization (SEV) guest object,
which can be used to provide the guest memory encryption support
on AMD processors.
@ -5229,6 +5229,10 @@ SRST
session with the guest owner to negotiate keys used for
attestation. The file must be encoded in base64.
The ``kernel-hashes`` adds the hashes of given kernel/initrd/
cmdline to a designated guest firmware page for measured Linux
boot with -kernel. The default is off. (Since 6.2)
e.g to launch a SEV guest
.. parsed-literal::

20
target/i386/sev.c
View file

@ -62,6 +62,7 @@ struct SevGuestState {
char *session_file;
uint32_t cbitpos;
uint32_t reduced_phys_bits;
bool kernel_hashes;
/* runtime state */
uint32_t handle;
@ -327,6 +328,20 @@ sev_guest_set_sev_device(Object *obj, const char *value, Error **errp)
sev->sev_device = g_strdup(value);
}
static bool sev_guest_get_kernel_hashes(Object *obj, Error **errp)
{
SevGuestState *sev = SEV_GUEST(obj);
return sev->kernel_hashes;
}
static void sev_guest_set_kernel_hashes(Object *obj, bool value, Error **errp)
{
SevGuestState *sev = SEV_GUEST(obj);
sev->kernel_hashes = value;
}
static void
sev_guest_class_init(ObjectClass *oc, void *data)
{
@ -345,6 +360,11 @@ sev_guest_class_init(ObjectClass *oc, void *data)
sev_guest_set_session_file);
object_class_property_set_description(oc, "session-file",
"guest owners session parameters (encoded with base64)");
object_class_property_add_bool(oc, "kernel-hashes",
sev_guest_get_kernel_hashes,
sev_guest_set_kernel_hashes);
object_class_property_set_description(oc, "kernel-hashes",
"add kernel hashes to guest firmware for measured Linux boot");
}
static void