From: David Gibson <david@gibson.dropbear.id.au> To: pair@us.ibm.com, pbonzini@redhat.com, frankja@linux.ibm.com, brijesh.singh@amd.com, dgilbert@redhat.com, qemu-devel@nongnu.org Cc: Eduardo Habkost <ehabkost@redhat.com>, qemu-ppc@nongnu.org, rth@twiddle.net, thuth@redhat.com, berrange@redhat.com, mdroth@linux.vnet.ibm.com, Marcelo Tosatti <mtosatti@redhat.com>, "Michael S. Tsirkin" <mst@redhat.com>, Marcel Apfelbaum <marcel.apfelbaum@gmail.com>, david@redhat.com, Richard Henderson <richard.henderson@linaro.org>, borntraeger@de.ibm.com, David Gibson <david@gibson.dropbear.id.au>, cohuck@redhat.com, kvm@vger.kernel.org, qemu-s390x@nongnu.org, pasic@linux.ibm.com Subject: [for-6.0 v5 05/13] securable guest memory: Rework the "memory-encryption" property Date: Fri, 4 Dec 2020 16:44:07 +1100 [thread overview] Message-ID: <20201204054415.579042-6-david@gibson.dropbear.id.au> (raw) In-Reply-To: <20201204054415.579042-1-david@gibson.dropbear.id.au> Currently the "memory-encryption" property is only looked at once we get to kvm_init(). Although protection of guest memory from the hypervisor isn't something that could really ever work with TCG, it's not conceptually tied to the KVM accelerator. In addition, the way the string property is resolved to an object is almost identical to how a QOM link property is handled. So, create a new "securable-guest-memory" link property which sets this QOM interface link directly in the machine. For compatibility we keep the "memory-encryption" property, but now implemented in terms of the new property. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> --- accel/kvm/kvm-all.c | 22 ++++++---------------- hw/core/machine.c | 43 +++++++++++++++++++++++++++++++++++++------ include/hw/boards.h | 2 +- 3 files changed, 44 insertions(+), 23 deletions(-) diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c index 9e7cea64d6..92a49b328a 100644 --- a/accel/kvm/kvm-all.c +++ b/accel/kvm/kvm-all.c @@ -2207,24 +2207,14 @@ static int kvm_init(MachineState *ms) * if memory encryption object is specified then initialize the memory * encryption context. */ - if (ms->memory_encryption) { - Object *obj = object_resolve_path_component(object_get_objects_root(), - ms->memory_encryption); - - if (object_dynamic_cast(obj, TYPE_SECURABLE_GUEST_MEMORY)) { - SecurableGuestMemory *sgm = SECURABLE_GUEST_MEMORY(obj); - - /* FIXME handle mechanisms other than SEV */ - ret = sev_kvm_init(sgm); - if (ret < 0) { - goto err; - } - - kvm_state->sgm = sgm; - } else { - ret = -1; + if (ms->sgm) { + /* FIXME handle mechanisms other than SEV */ + ret = sev_kvm_init(ms->sgm); + if (ret < 0) { goto err; } + + kvm_state->sgm = ms->sgm; } ret = kvm_arch_init(ms, s); diff --git a/hw/core/machine.c b/hw/core/machine.c index cb0711508d..816ea3ae3e 100644 --- a/hw/core/machine.c +++ b/hw/core/machine.c @@ -27,6 +27,7 @@ #include "hw/pci/pci.h" #include "hw/mem/nvdimm.h" #include "migration/vmstate.h" +#include "exec/securable-guest-memory.h" GlobalProperty hw_compat_5_1[] = { { "vhost-scsi", "num_queues", "1"}, @@ -417,16 +418,37 @@ static char *machine_get_memory_encryption(Object *obj, Error **errp) { MachineState *ms = MACHINE(obj); - return g_strdup(ms->memory_encryption); + if (ms->sgm) { + return g_strdup(object_get_canonical_path_component(OBJECT(ms->sgm))); + } + + return NULL; } static void machine_set_memory_encryption(Object *obj, const char *value, Error **errp) { - MachineState *ms = MACHINE(obj); + Object *sgm = + object_resolve_path_component(object_get_objects_root(), value); + + if (!sgm) { + error_setg(errp, "No such memory encryption object '%s'", value); + return; + } - g_free(ms->memory_encryption); - ms->memory_encryption = g_strdup(value); + object_property_set_link(obj, "securable-guest-memory", sgm, errp); +} + +static void machine_check_securable_guest_memory(const Object *obj, + const char *name, + Object *new_target, + Error **errp) +{ + /* + * So far the only constraint is that the target has the + * TYPE_SECURABLE_GUEST_MEMORY interface, and that's checked by + * the QOM core + */ } static bool machine_get_nvdimm(Object *obj, Error **errp) @@ -833,6 +855,15 @@ static void machine_class_init(ObjectClass *oc, void *data) object_class_property_set_description(oc, "suppress-vmdesc", "Set on to disable self-describing migration"); + object_class_property_add_link(oc, "securable-guest-memory", + TYPE_SECURABLE_GUEST_MEMORY, + offsetof(MachineState, sgm), + machine_check_securable_guest_memory, + OBJ_PROP_LINK_STRONG); + object_class_property_set_description(oc, "securable-guest-memory", + "Set securable guest memory scheme to use"); + + /* For compatibility */ object_class_property_add_str(oc, "memory-encryption", machine_get_memory_encryption, machine_set_memory_encryption); object_class_property_set_description(oc, "memory-encryption", @@ -1123,9 +1154,9 @@ void machine_run_board_init(MachineState *machine) cc->deprecation_note); } - if (machine->memory_encryption) { + if (machine->sgm) { /* - * With memory encryption, the host can't see the real + * With securable guest memory, the host can't see the real * contents of RAM, so there's no point in it trying to merge * areas. */ diff --git a/include/hw/boards.h b/include/hw/boards.h index a49e3a6b44..2ea9790183 100644 --- a/include/hw/boards.h +++ b/include/hw/boards.h @@ -269,7 +269,7 @@ struct MachineState { bool iommu; bool suppress_vmdesc; bool enable_graphics; - char *memory_encryption; + SecurableGuestMemory *sgm; char *ram_memdev_id; /* * convenience alias to ram_memdev_id backend memory region -- 2.28.0
WARNING: multiple messages have this Message-ID (diff)
From: David Gibson <david@gibson.dropbear.id.au> To: pair@us.ibm.com, pbonzini@redhat.com, frankja@linux.ibm.com, brijesh.singh@amd.com, dgilbert@redhat.com, qemu-devel@nongnu.org Cc: thuth@redhat.com, cohuck@redhat.com, berrange@redhat.com, Eduardo Habkost <ehabkost@redhat.com>, kvm@vger.kernel.org, "Michael S. Tsirkin" <mst@redhat.com>, Richard Henderson <richard.henderson@linaro.org>, Marcelo Tosatti <mtosatti@redhat.com>, david@redhat.com, mdroth@linux.vnet.ibm.com, pasic@linux.ibm.com, borntraeger@de.ibm.com, qemu-s390x@nongnu.org, qemu-ppc@nongnu.org, David Gibson <david@gibson.dropbear.id.au>, rth@twiddle.net Subject: [for-6.0 v5 05/13] securable guest memory: Rework the "memory-encryption" property Date: Fri, 4 Dec 2020 16:44:07 +1100 [thread overview] Message-ID: <20201204054415.579042-6-david@gibson.dropbear.id.au> (raw) In-Reply-To: <20201204054415.579042-1-david@gibson.dropbear.id.au> Currently the "memory-encryption" property is only looked at once we get to kvm_init(). Although protection of guest memory from the hypervisor isn't something that could really ever work with TCG, it's not conceptually tied to the KVM accelerator. In addition, the way the string property is resolved to an object is almost identical to how a QOM link property is handled. So, create a new "securable-guest-memory" link property which sets this QOM interface link directly in the machine. For compatibility we keep the "memory-encryption" property, but now implemented in terms of the new property. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> --- accel/kvm/kvm-all.c | 22 ++++++---------------- hw/core/machine.c | 43 +++++++++++++++++++++++++++++++++++++------ include/hw/boards.h | 2 +- 3 files changed, 44 insertions(+), 23 deletions(-) diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c index 9e7cea64d6..92a49b328a 100644 --- a/accel/kvm/kvm-all.c +++ b/accel/kvm/kvm-all.c @@ -2207,24 +2207,14 @@ static int kvm_init(MachineState *ms) * if memory encryption object is specified then initialize the memory * encryption context. */ - if (ms->memory_encryption) { - Object *obj = object_resolve_path_component(object_get_objects_root(), - ms->memory_encryption); - - if (object_dynamic_cast(obj, TYPE_SECURABLE_GUEST_MEMORY)) { - SecurableGuestMemory *sgm = SECURABLE_GUEST_MEMORY(obj); - - /* FIXME handle mechanisms other than SEV */ - ret = sev_kvm_init(sgm); - if (ret < 0) { - goto err; - } - - kvm_state->sgm = sgm; - } else { - ret = -1; + if (ms->sgm) { + /* FIXME handle mechanisms other than SEV */ + ret = sev_kvm_init(ms->sgm); + if (ret < 0) { goto err; } + + kvm_state->sgm = ms->sgm; } ret = kvm_arch_init(ms, s); diff --git a/hw/core/machine.c b/hw/core/machine.c index cb0711508d..816ea3ae3e 100644 --- a/hw/core/machine.c +++ b/hw/core/machine.c @@ -27,6 +27,7 @@ #include "hw/pci/pci.h" #include "hw/mem/nvdimm.h" #include "migration/vmstate.h" +#include "exec/securable-guest-memory.h" GlobalProperty hw_compat_5_1[] = { { "vhost-scsi", "num_queues", "1"}, @@ -417,16 +418,37 @@ static char *machine_get_memory_encryption(Object *obj, Error **errp) { MachineState *ms = MACHINE(obj); - return g_strdup(ms->memory_encryption); + if (ms->sgm) { + return g_strdup(object_get_canonical_path_component(OBJECT(ms->sgm))); + } + + return NULL; } static void machine_set_memory_encryption(Object *obj, const char *value, Error **errp) { - MachineState *ms = MACHINE(obj); + Object *sgm = + object_resolve_path_component(object_get_objects_root(), value); + + if (!sgm) { + error_setg(errp, "No such memory encryption object '%s'", value); + return; + } - g_free(ms->memory_encryption); - ms->memory_encryption = g_strdup(value); + object_property_set_link(obj, "securable-guest-memory", sgm, errp); +} + +static void machine_check_securable_guest_memory(const Object *obj, + const char *name, + Object *new_target, + Error **errp) +{ + /* + * So far the only constraint is that the target has the + * TYPE_SECURABLE_GUEST_MEMORY interface, and that's checked by + * the QOM core + */ } static bool machine_get_nvdimm(Object *obj, Error **errp) @@ -833,6 +855,15 @@ static void machine_class_init(ObjectClass *oc, void *data) object_class_property_set_description(oc, "suppress-vmdesc", "Set on to disable self-describing migration"); + object_class_property_add_link(oc, "securable-guest-memory", + TYPE_SECURABLE_GUEST_MEMORY, + offsetof(MachineState, sgm), + machine_check_securable_guest_memory, + OBJ_PROP_LINK_STRONG); + object_class_property_set_description(oc, "securable-guest-memory", + "Set securable guest memory scheme to use"); + + /* For compatibility */ object_class_property_add_str(oc, "memory-encryption", machine_get_memory_encryption, machine_set_memory_encryption); object_class_property_set_description(oc, "memory-encryption", @@ -1123,9 +1154,9 @@ void machine_run_board_init(MachineState *machine) cc->deprecation_note); } - if (machine->memory_encryption) { + if (machine->sgm) { /* - * With memory encryption, the host can't see the real + * With securable guest memory, the host can't see the real * contents of RAM, so there's no point in it trying to merge * areas. */ diff --git a/include/hw/boards.h b/include/hw/boards.h index a49e3a6b44..2ea9790183 100644 --- a/include/hw/boards.h +++ b/include/hw/boards.h @@ -269,7 +269,7 @@ struct MachineState { bool iommu; bool suppress_vmdesc; bool enable_graphics; - char *memory_encryption; + SecurableGuestMemory *sgm; char *ram_memdev_id; /* * convenience alias to ram_memdev_id backend memory region -- 2.28.0
next prev parent reply other threads:[~2020-12-04 5:46 UTC|newest] Thread overview: 186+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-12-04 5:44 [for-6.0 v5 00/13] Generalize memory encryption models David Gibson 2020-12-04 5:44 ` David Gibson 2020-12-04 5:44 ` [for-6.0 v5 01/13] qom: Allow optional sugar props David Gibson 2020-12-04 5:44 ` David Gibson 2020-12-04 12:57 ` Cornelia Huck 2020-12-04 12:57 ` Cornelia Huck 2020-12-14 21:25 ` Eduardo Habkost 2020-12-14 21:25 ` Eduardo Habkost 2021-01-11 18:04 ` Philippe Mathieu-Daudé 2021-01-11 18:04 ` Philippe Mathieu-Daudé 2020-12-04 5:44 ` [for-6.0 v5 02/13] securable guest memory: Introduce new securable guest memory base class David Gibson 2020-12-04 5:44 ` David Gibson 2020-12-04 5:44 ` [for-6.0 v5 03/13] securable guest memory: Handle memory encryption via interface David Gibson 2020-12-04 5:44 ` David Gibson 2020-12-04 13:10 ` Cornelia Huck 2020-12-04 13:10 ` Cornelia Huck 2021-01-08 4:03 ` David Gibson 2021-01-08 4:03 ` David Gibson 2021-01-12 3:49 ` David Gibson 2021-01-12 3:49 ` David Gibson 2020-12-04 5:44 ` [for-6.0 v5 04/13] securable guest memory: Move side effect out of machine_set_memory_encryption() David Gibson 2020-12-04 5:44 ` David Gibson 2020-12-04 5:44 ` David Gibson [this message] 2020-12-04 5:44 ` [for-6.0 v5 05/13] securable guest memory: Rework the "memory-encryption" property David Gibson 2021-01-11 18:09 ` Philippe Mathieu-Daudé 2021-01-11 18:09 ` Philippe Mathieu-Daudé 2020-12-04 5:44 ` [for-6.0 v5 06/13] securable guest memory: Decouple kvm_memcrypt_*() helpers from KVM David Gibson 2020-12-04 5:44 ` David Gibson 2021-01-11 18:13 ` Philippe Mathieu-Daudé 2021-01-11 18:13 ` Philippe Mathieu-Daudé 2021-01-12 3:03 ` David Gibson 2021-01-12 3:03 ` David Gibson 2020-12-04 5:44 ` [for-6.0 v5 07/13] sev: Add Error ** to sev_kvm_init() David Gibson 2020-12-04 5:44 ` David Gibson 2020-12-14 16:50 ` Cornelia Huck 2020-12-14 16:50 ` Cornelia Huck 2020-12-04 5:44 ` [for-6.0 v5 08/13] securable guest memory: Introduce sgm "ready" flag David Gibson 2020-12-04 5:44 ` David Gibson 2020-12-14 17:00 ` Cornelia Huck 2020-12-14 17:00 ` Cornelia Huck 2020-12-17 5:38 ` David Gibson 2020-12-17 5:38 ` David Gibson 2020-12-17 11:24 ` Cornelia Huck 2020-12-17 11:24 ` Cornelia Huck 2020-12-04 5:44 ` [for-6.0 v5 09/13] securable guest memory: Move SEV initialization into arch specific code David Gibson 2020-12-04 5:44 ` David Gibson 2020-12-04 5:44 ` [for-6.0 v5 10/13] spapr: Add PEF based securable guest memory David Gibson 2020-12-04 5:44 ` David Gibson 2021-01-05 23:34 ` Ram Pai 2021-01-05 23:34 ` Ram Pai 2021-01-08 0:34 ` David Gibson 2021-01-08 0:34 ` David Gibson 2020-12-04 5:44 ` [for-6.0 v5 11/13] spapr: PEF: prevent migration David Gibson 2020-12-04 5:44 ` David Gibson 2020-12-14 17:22 ` Cornelia Huck 2020-12-14 17:22 ` Cornelia Huck 2020-12-17 5:47 ` David Gibson 2020-12-17 5:47 ` David Gibson 2020-12-17 11:38 ` Cornelia Huck 2020-12-17 11:38 ` Cornelia Huck 2020-12-17 14:15 ` Greg Kurz 2020-12-17 14:15 ` Greg Kurz 2020-12-18 11:41 ` Cornelia Huck 2020-12-18 11:41 ` Cornelia Huck 2020-12-18 12:08 ` Dr. David Alan Gilbert 2020-12-18 12:08 ` Dr. David Alan Gilbert 2021-01-04 7:15 ` Ram Pai 2021-01-04 7:15 ` Ram Pai 2021-01-04 12:46 ` [EXTERNAL] " Halil Pasic 2021-01-04 12:46 ` Halil Pasic 2021-01-04 18:40 ` Ram Pai 2021-01-04 18:40 ` Ram Pai 2021-01-05 10:56 ` [EXTERNAL] " Halil Pasic 2021-01-05 10:56 ` Halil Pasic 2021-01-05 20:41 ` Ram Pai 2021-01-05 20:41 ` Ram Pai 2021-01-11 16:59 ` Cornelia Huck 2021-01-11 16:59 ` Cornelia Huck 2021-01-11 19:58 ` Ram Pai 2021-01-11 19:58 ` Ram Pai 2021-01-12 8:19 ` Cornelia Huck 2021-01-12 8:19 ` Cornelia Huck 2021-01-12 18:55 ` Ram Pai 2021-01-12 18:55 ` Ram Pai 2021-01-13 8:06 ` Cornelia Huck 2021-01-13 8:06 ` Cornelia Huck 2021-01-15 18:55 ` Ram Pai 2021-01-15 18:55 ` Ram Pai 2021-01-19 8:19 ` Cornelia Huck 2021-01-19 8:19 ` Cornelia Huck 2021-01-19 9:59 ` Daniel P. Berrangé 2021-01-19 9:59 ` Daniel P. Berrangé 2021-01-14 11:23 ` Daniel P. Berrangé 2021-01-14 11:23 ` Daniel P. Berrangé 2021-01-13 12:42 ` Dr. David Alan Gilbert 2021-01-13 12:42 ` Dr. David Alan Gilbert 2021-01-14 10:28 ` Christian Borntraeger 2021-01-14 10:28 ` Christian Borntraeger 2021-01-14 10:36 ` Dr. David Alan Gilbert 2021-01-14 10:36 ` Dr. David Alan Gilbert 2021-01-14 10:52 ` Christian Borntraeger 2021-01-14 10:52 ` Christian Borntraeger 2021-01-14 11:05 ` Cornelia Huck 2021-01-14 11:05 ` Cornelia Huck 2021-01-14 11:45 ` Dr. David Alan Gilbert 2021-01-14 11:45 ` Dr. David Alan Gilbert 2021-01-14 11:50 ` Christian Borntraeger 2021-01-14 11:50 ` Christian Borntraeger 2021-01-14 12:20 ` Daniel P. Berrangé 2021-01-14 12:20 ` Daniel P. Berrangé 2021-01-14 14:04 ` Cornelia Huck 2021-01-14 14:04 ` Cornelia Huck 2021-01-14 14:09 ` Christian Borntraeger 2021-01-14 14:09 ` Christian Borntraeger 2021-01-14 14:15 ` Daniel P. Berrangé 2021-01-14 14:15 ` Daniel P. Berrangé 2021-01-14 15:25 ` Christian Borntraeger 2021-01-14 15:25 ` Christian Borntraeger 2021-01-14 15:33 ` Daniel P. Berrangé 2021-01-14 15:33 ` Daniel P. Berrangé 2021-01-15 18:24 ` Ram Pai 2021-01-15 18:24 ` Ram Pai 2021-01-14 11:25 ` Daniel P. Berrangé 2021-01-14 11:25 ` Daniel P. Berrangé 2021-01-14 23:51 ` David Gibson 2021-01-14 23:51 ` David Gibson 2021-01-18 17:39 ` Dr. David Alan Gilbert 2021-01-18 17:39 ` Dr. David Alan Gilbert 2021-01-19 8:28 ` Christian Borntraeger 2021-01-19 8:28 ` Christian Borntraeger 2021-01-19 8:34 ` Cornelia Huck 2021-01-19 8:34 ` Cornelia Huck 2020-12-04 5:44 ` [for-6.0 v5 12/13] securable guest memory: Alter virtio default properties for protected guests David Gibson 2020-12-04 5:44 ` David Gibson 2020-12-04 8:10 ` Christian Borntraeger 2020-12-04 8:10 ` Christian Borntraeger 2020-12-04 8:17 ` Cornelia Huck 2020-12-04 8:17 ` Cornelia Huck 2020-12-04 8:29 ` Christian Borntraeger 2020-12-04 8:29 ` Christian Borntraeger 2020-12-04 14:43 ` Halil Pasic 2020-12-04 14:43 ` Halil Pasic 2020-12-08 1:54 ` David Gibson 2020-12-08 1:54 ` David Gibson 2020-12-08 8:16 ` Christian Borntraeger 2020-12-08 8:16 ` Christian Borntraeger 2020-12-08 10:28 ` Halil Pasic 2020-12-08 10:28 ` Halil Pasic 2020-12-08 12:50 ` Cornelia Huck 2020-12-08 12:50 ` Cornelia Huck 2020-12-17 5:53 ` David Gibson 2020-12-17 5:53 ` David Gibson 2020-12-04 17:04 ` Cornelia Huck 2020-12-04 17:04 ` Cornelia Huck 2020-12-04 5:44 ` [for-6.0 v5 13/13] s390: Recognize securable-guest-memory option David Gibson 2020-12-04 5:44 ` David Gibson 2020-12-15 11:45 ` Cornelia Huck 2020-12-15 11:45 ` Cornelia Huck 2020-12-17 5:54 ` David Gibson 2020-12-17 5:54 ` David Gibson 2020-12-04 8:06 ` [for-6.0 v5 00/13] Generalize memory encryption models Christian Borntraeger 2020-12-04 8:06 ` Christian Borntraeger 2020-12-04 13:02 ` Cornelia Huck 2020-12-04 13:02 ` Cornelia Huck 2020-12-04 13:07 ` Dr. David Alan Gilbert 2020-12-04 13:07 ` Dr. David Alan Gilbert 2020-12-04 13:12 ` Cornelia Huck 2020-12-04 13:12 ` Cornelia Huck 2020-12-08 2:57 ` David Gibson 2020-12-08 2:57 ` David Gibson 2020-12-08 12:43 ` Cornelia Huck 2020-12-08 12:43 ` Cornelia Huck 2020-12-17 6:21 ` David Gibson 2020-12-17 6:21 ` David Gibson 2020-12-17 11:43 ` Cornelia Huck 2020-12-17 11:43 ` Cornelia Huck 2020-12-04 13:25 ` Daniel P. Berrangé 2020-12-04 13:25 ` Daniel P. Berrangé 2020-12-04 13:51 ` Halil Pasic 2020-12-04 13:51 ` Halil Pasic 2020-12-08 2:54 ` David Gibson 2020-12-08 2:54 ` David Gibson 2020-12-04 9:50 ` Daniel P. Berrangé 2020-12-04 9:50 ` Daniel P. Berrangé 2021-01-12 3:02 ` David Gibson 2021-01-12 3:02 ` David Gibson
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