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From: David Gibson <david@gibson.dropbear.id.au>
To: brijesh.singh@amd.com, pair@us.ibm.com, dgilbert@redhat.com,
	pasic@linux.ibm.com, qemu-devel@nongnu.org
Cc: cohuck@redhat.com,
	Richard Henderson <richard.henderson@linaro.org>,
	Marcelo Tosatti <mtosatti@redhat.com>,
	David Hildenbrand <david@redhat.com>,
	borntraeger@de.ibm.com,
	Marcel Apfelbaum <marcel.apfelbaum@gmail.com>,
	Paolo Bonzini <pbonzini@redhat.com>,
	mst@redhat.com, jun.nakajima@intel.com, thuth@redhat.com,
	pragyansri.pathi@intel.com, kvm@vger.kernel.org,
	Eduardo Habkost <ehabkost@redhat.com>,
	qemu-s390x@nongnu.org, qemu-ppc@nongnu.org,
	frankja@linux.ibm.com, Greg Kurz <groug@kaod.org>,
	mdroth@linux.vnet.ibm.com,
	David Gibson <david@gibson.dropbear.id.au>,
	berrange@redhat.com, andi.kleen@intel.com
Subject: [PATCH v7 05/13] confidential guest support: Rework the "memory-encryption" property
Date: Thu, 14 Jan 2021 10:58:03 +1100	[thread overview]
Message-ID: <20210113235811.1909610-6-david@gibson.dropbear.id.au> (raw)
In-Reply-To: <20210113235811.1909610-1-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 "confidential-guest-support" 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: Greg Kurz <groug@kaod.org>
---
 accel/kvm/kvm-all.c  |  5 +++--
 accel/kvm/sev-stub.c |  5 +++--
 hw/core/machine.c    | 43 +++++++++++++++++++++++++++++++++++++------
 include/hw/boards.h  |  2 +-
 include/sysemu/sev.h |  2 +-
 target/i386/sev.c    | 32 ++------------------------------
 6 files changed, 47 insertions(+), 42 deletions(-)

diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c
index 260ed73ffe..28ab126f70 100644
--- a/accel/kvm/kvm-all.c
+++ b/accel/kvm/kvm-all.c
@@ -2181,8 +2181,9 @@ static int kvm_init(MachineState *ms)
      * if memory encryption object is specified then initialize the memory
      * encryption context.
      */
-    if (ms->memory_encryption) {
-        ret = sev_guest_init(ms->memory_encryption);
+    if (ms->cgs) {
+        /* FIXME handle mechanisms other than SEV */
+        ret = sev_kvm_init(ms->cgs);
         if (ret < 0) {
             goto err;
         }
diff --git a/accel/kvm/sev-stub.c b/accel/kvm/sev-stub.c
index 5db9ab8f00..3d4787ae4a 100644
--- a/accel/kvm/sev-stub.c
+++ b/accel/kvm/sev-stub.c
@@ -15,7 +15,8 @@
 #include "qemu-common.h"
 #include "sysemu/sev.h"
 
-int sev_guest_init(const char *id)
+int sev_kvm_init(ConfidentialGuestSupport *cgs)
 {
-    return -1;
+    /* SEV can't be selected if it's not compiled */
+    g_assert_not_reached();
 }
diff --git a/hw/core/machine.c b/hw/core/machine.c
index 8909117d80..94194ab82d 100644
--- a/hw/core/machine.c
+++ b/hw/core/machine.c
@@ -32,6 +32,7 @@
 #include "hw/mem/nvdimm.h"
 #include "migration/global_state.h"
 #include "migration/vmstate.h"
+#include "exec/confidential-guest-support.h"
 
 GlobalProperty hw_compat_5_2[] = {};
 const size_t hw_compat_5_2_len = G_N_ELEMENTS(hw_compat_5_2);
@@ -427,16 +428,37 @@ static char *machine_get_memory_encryption(Object *obj, Error **errp)
 {
     MachineState *ms = MACHINE(obj);
 
-    return g_strdup(ms->memory_encryption);
+    if (ms->cgs) {
+        return g_strdup(object_get_canonical_path_component(OBJECT(ms->cgs)));
+    }
+
+    return NULL;
 }
 
 static void machine_set_memory_encryption(Object *obj, const char *value,
                                         Error **errp)
 {
-    MachineState *ms = MACHINE(obj);
+    Object *cgs =
+        object_resolve_path_component(object_get_objects_root(), value);
+
+    if (!cgs) {
+        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, "confidential-guest-support", cgs, errp);
+}
+
+static void machine_check_confidential_guest_support(const Object *obj,
+                                                     const char *name,
+                                                     Object *new_target,
+                                                     Error **errp)
+{
+    /*
+     * So far the only constraint is that the target has the
+     * TYPE_CONFIDENTIAL_GUEST_SUPPORT interface, and that's checked
+     * by the QOM core
+     */
 }
 
 static bool machine_get_nvdimm(Object *obj, Error **errp)
@@ -836,6 +858,15 @@ 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, "confidential-guest-support",
+                                   TYPE_CONFIDENTIAL_GUEST_SUPPORT,
+                                   offsetof(MachineState, cgs),
+                                   machine_check_confidential_guest_support,
+                                   OBJ_PROP_LINK_STRONG);
+    object_class_property_set_description(oc, "confidential-guest-support",
+                                          "Set confidential guest scheme to support");
+
+    /* 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",
@@ -1158,9 +1189,9 @@ void machine_run_board_init(MachineState *machine)
                     cc->deprecation_note);
     }
 
-    if (machine->memory_encryption) {
+    if (machine->cgs) {
         /*
-         * With memory encryption, the host can't see the real
+         * With confidential guests, 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 17b1f3f0b9..1acd662fa5 100644
--- a/include/hw/boards.h
+++ b/include/hw/boards.h
@@ -270,7 +270,7 @@ struct MachineState {
     bool iommu;
     bool suppress_vmdesc;
     bool enable_graphics;
-    char *memory_encryption;
+    ConfidentialGuestSupport *cgs;
     char *ram_memdev_id;
     /*
      * convenience alias to ram_memdev_id backend memory region
diff --git a/include/sysemu/sev.h b/include/sysemu/sev.h
index 7335e59867..3b5b1aacf1 100644
--- a/include/sysemu/sev.h
+++ b/include/sysemu/sev.h
@@ -16,7 +16,7 @@
 
 #include "sysemu/kvm.h"
 
-int sev_guest_init(const char *id);
+int sev_kvm_init(ConfidentialGuestSupport *cgs);
 int sev_encrypt_flash(uint8_t *ptr, uint64_t len, Error **errp);
 int sev_inject_launch_secret(const char *hdr, const char *secret,
                              uint64_t gpa, Error **errp);
diff --git a/target/i386/sev.c b/target/i386/sev.c
index 2a4b2187d6..5399a136ad 100644
--- a/target/i386/sev.c
+++ b/target/i386/sev.c
@@ -335,26 +335,6 @@ static const TypeInfo sev_guest_info = {
     }
 };
 
-static SevGuestState *
-lookup_sev_guest_info(const char *id)
-{
-    Object *obj;
-    SevGuestState *info;
-
-    obj = object_resolve_path_component(object_get_objects_root(), id);
-    if (!obj) {
-        return NULL;
-    }
-
-    info = (SevGuestState *)
-            object_dynamic_cast(obj, TYPE_SEV_GUEST);
-    if (!info) {
-        return NULL;
-    }
-
-    return info;
-}
-
 bool
 sev_enabled(void)
 {
@@ -682,10 +662,9 @@ sev_vm_state_change(void *opaque, int running, RunState state)
     }
 }
 
-int
-sev_guest_init(const char *id)
+int sev_kvm_init(ConfidentialGuestSupport *cgs)
 {
-    SevGuestState *sev;
+    SevGuestState *sev = SEV_GUEST(cgs);
     char *devname;
     int ret, fw_error;
     uint32_t ebx;
@@ -698,13 +677,6 @@ sev_guest_init(const char *id)
         return -1;
     }
 
-    sev = lookup_sev_guest_info(id);
-    if (!sev) {
-        error_report("%s: '%s' is not a valid '%s' object",
-                     __func__, id, TYPE_SEV_GUEST);
-        goto err;
-    }
-
     sev_guest = sev;
     sev->state = SEV_STATE_UNINIT;
 
-- 
2.29.2


  parent reply	other threads:[~2021-01-14  1:53 UTC|newest]

Thread overview: 45+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-13 23:57 [PATCH v7 00/13] Generalize memory encryption models David Gibson
2021-01-13 23:57 ` [PATCH v7 01/13] qom: Allow optional sugar props David Gibson
2021-01-13 23:58 ` [PATCH v7 02/13] confidential guest support: Introduce new confidential guest support class David Gibson
2021-01-14  9:34   ` Daniel P. Berrangé
2021-01-14 10:42     ` David Gibson
2021-01-18 18:51   ` Dr. David Alan Gilbert
2021-01-21  1:06     ` David Gibson
2021-01-21  9:08       ` Dr. David Alan Gilbert
2021-01-29  2:32         ` David Gibson
2021-01-13 23:58 ` [PATCH v7 03/13] sev: Remove false abstraction of flash encryption David Gibson
2021-01-15 12:54   ` Cornelia Huck
2021-01-18  2:59     ` David Gibson
2021-01-13 23:58 ` [PATCH v7 04/13] confidential guest support: Move side effect out of machine_set_memory_encryption() David Gibson
2021-01-15 12:56   ` Cornelia Huck
2021-01-13 23:58 ` David Gibson [this message]
2021-01-15 13:06   ` [PATCH v7 05/13] confidential guest support: Rework the "memory-encryption" property Cornelia Huck
2021-01-13 23:58 ` [PATCH v7 06/13] sev: Add Error ** to sev_kvm_init() David Gibson
2021-01-13 23:58 ` [PATCH v7 07/13] confidential guest support: Introduce cgs "ready" flag David Gibson
2021-01-14  8:55   ` Greg Kurz
2021-01-15 13:12   ` Cornelia Huck
2021-01-18 19:47   ` Dr. David Alan Gilbert
2021-01-19  8:16     ` Cornelia Huck
2021-02-02  1:41       ` David Gibson
2021-01-13 23:58 ` [PATCH v7 08/13] confidential guest support: Move SEV initialization into arch specific code David Gibson
2021-01-15 13:24   ` Cornelia Huck
2021-01-18  3:03     ` David Gibson
2021-01-18  8:03       ` Cornelia Huck
2021-01-29  3:12         ` David Gibson
2021-01-13 23:58 ` [PATCH v7 09/13] confidential guest support: Update documentation David Gibson
2021-01-14 10:07   ` Greg Kurz
2021-01-15 15:36   ` Cornelia Huck
2021-01-29  2:36     ` David Gibson
2021-01-13 23:58 ` [PATCH v7 10/13] spapr: Add PEF based confidential guest support David Gibson
2021-01-15 15:41   ` Cornelia Huck
2021-01-29  2:43     ` David Gibson
2021-01-13 23:58 ` [PATCH v7 11/13] spapr: PEF: prevent migration David Gibson
2021-01-13 23:58 ` [PATCH v7 12/13] confidential guest support: Alter virtio default properties for protected guests David Gibson
2021-01-13 23:58 ` [PATCH v7 13/13] s390: Recognize confidential-guest-support option David Gibson
2021-01-14  9:10   ` Christian Borntraeger
2021-01-14  9:19     ` Christian Borntraeger
2021-01-14  9:24       ` Christian Borntraeger
2021-01-15  0:13         ` David Gibson
2021-01-14 11:45     ` David Gibson
2021-01-15 16:36   ` Cornelia Huck
2021-01-18 17:06     ` Christian Borntraeger

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