abc27d4241
The platform specific details of mechanisms for implementing confidential guest support may require setup at various points during initialization. Thus, it's not really feasible to have a single cgs initialization hook, but instead each mechanism needs its own initialization calls in arch or machine specific code. However, to make it harder to have a bug where a mechanism isn't properly initialized under some circumstances, we want to have a common place, late in boot, where we verify that cgs has been initialized if it was requested. This patch introduces a ready flag to the ConfidentialGuestSupport base type to accomplish this, which we verify in qemu_machine_creation_done(). Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: Greg Kurz <groug@kaod.org>
63 lines
2.2 KiB
C
63 lines
2.2 KiB
C
/*
|
|
* QEMU Confidential Guest support
|
|
* This interface describes the common pieces between various
|
|
* schemes for protecting guest memory or other state against a
|
|
* compromised hypervisor. This includes memory encryption (AMD's
|
|
* SEV and Intel's MKTME) or special protection modes (PEF on POWER,
|
|
* or PV on s390x).
|
|
*
|
|
* Copyright Red Hat.
|
|
*
|
|
* Authors:
|
|
* David Gibson <david@gibson.dropbear.id.au>
|
|
*
|
|
* This work is licensed under the terms of the GNU GPL, version 2 or
|
|
* later. See the COPYING file in the top-level directory.
|
|
*
|
|
*/
|
|
#ifndef QEMU_CONFIDENTIAL_GUEST_SUPPORT_H
|
|
#define QEMU_CONFIDENTIAL_GUEST_SUPPORT_H
|
|
|
|
#ifndef CONFIG_USER_ONLY
|
|
|
|
#include "qom/object.h"
|
|
|
|
#define TYPE_CONFIDENTIAL_GUEST_SUPPORT "confidential-guest-support"
|
|
OBJECT_DECLARE_SIMPLE_TYPE(ConfidentialGuestSupport, CONFIDENTIAL_GUEST_SUPPORT)
|
|
|
|
struct ConfidentialGuestSupport {
|
|
Object parent;
|
|
|
|
/*
|
|
* ready: flag set by CGS initialization code once it's ready to
|
|
* start executing instructions in a potentially-secure
|
|
* guest
|
|
*
|
|
* The definition here is a bit fuzzy, because this is essentially
|
|
* part of a self-sanity-check, rather than a strict mechanism.
|
|
*
|
|
* It's not feasible to have a single point in the common machine
|
|
* init path to configure confidential guest support, because
|
|
* different mechanisms have different interdependencies requiring
|
|
* initialization in different places, often in arch or machine
|
|
* type specific code. It's also usually not possible to check
|
|
* for invalid configurations until that initialization code.
|
|
* That means it would be very easy to have a bug allowing CGS
|
|
* init to be bypassed entirely in certain configurations.
|
|
*
|
|
* Silently ignoring a requested security feature would be bad, so
|
|
* to avoid that we check late in init that this 'ready' flag is
|
|
* set if CGS was requested. If the CGS init hasn't happened, and
|
|
* so 'ready' is not set, we'll abort.
|
|
*/
|
|
bool ready;
|
|
};
|
|
|
|
typedef struct ConfidentialGuestSupportClass {
|
|
ObjectClass parent;
|
|
} ConfidentialGuestSupportClass;
|
|
|
|
#endif /* !CONFIG_USER_ONLY */
|
|
|
|
#endif /* QEMU_CONFIDENTIAL_GUEST_SUPPORT_H */
|