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Re: [RFC v2 11/18] guest memory protection: Handle memory encrption via
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From: |
David Gibson |
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Subject: |
Re: [RFC v2 11/18] guest memory protection: Handle memory encrption via interface |
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Date: |
Thu, 4 Jun 2020 13:27:51 +1000 |
On Mon, May 25, 2020 at 12:26:55PM +0200, Greg Kurz wrote:
>
> s/encrption/encryption
Fixed.
> On Thu, 21 May 2020 13:42:57 +1000
> David Gibson <david@gibson.dropbear.id.au> wrote:
>
> > At the moment AMD SEV sets a special function pointer, plus an opaque
> > handle in KVMState to let things know how to encrypt guest memory.
> >
> > Now that we have a QOM interface for handling things related to guest
> > memory protection, use a QOM method on that interface, rather than a bare
> > function pointer for this.
> >
> > Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
> > ---
> > accel/kvm/kvm-all.c | 23 +++----
> > accel/kvm/sev-stub.c | 5 --
> > include/exec/guest-memory-protection.h | 2 +
> > include/sysemu/sev.h | 6 +-
> > target/i386/sev.c | 84 ++++++++++++++------------
> > 5 files changed, 63 insertions(+), 57 deletions(-)
> >
> > diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c
> > index d06cc04079..40997de38c 100644
> > --- a/accel/kvm/kvm-all.c
> > +++ b/accel/kvm/kvm-all.c
> > @@ -45,6 +45,7 @@
> > #include "qapi/qapi-types-common.h"
> > #include "qapi/qapi-visit-common.h"
> > #include "sysemu/reset.h"
> > +#include "exec/guest-memory-protection.h"
> >
> > #include "hw/boards.h"
> >
> > @@ -119,8 +120,7 @@ struct KVMState
> > QLIST_HEAD(, KVMParkedVcpu) kvm_parked_vcpus;
> >
> > /* memory encryption */
> > - void *memcrypt_handle;
> > - int (*memcrypt_encrypt_data)(void *handle, uint8_t *ptr, uint64_t len);
> > + GuestMemoryProtection *guest_memory_protection;
> >
> > /* For "info mtree -f" to tell if an MR is registered in KVM */
> > int nr_as;
> > @@ -172,7 +172,7 @@ int kvm_get_max_memslots(void)
> >
> > bool kvm_memcrypt_enabled(void)
> > {
> > - if (kvm_state && kvm_state->memcrypt_handle) {
> > + if (kvm_state && kvm_state->guest_memory_protection) {
> > return true;
> > }
> >
> > @@ -181,10 +181,13 @@ bool kvm_memcrypt_enabled(void)
> >
> > int kvm_memcrypt_encrypt_data(uint8_t *ptr, uint64_t len)
> > {
> > - if (kvm_state->memcrypt_handle &&
> > - kvm_state->memcrypt_encrypt_data) {
> > - return kvm_state->memcrypt_encrypt_data(kvm_state->memcrypt_handle,
> > - ptr, len);
> > + GuestMemoryProtection *gmpo = kvm_state->guest_memory_protection;
> > +
> > + if (gmpo) {
> > + GuestMemoryProtectionClass *gmpc =
> > + GUEST_MEMORY_PROTECTION_GET_CLASS(gmpo);
> > +
> > + return gmpc->encrypt_data(gmpo, ptr, len);
> > }
> >
> > return 1;
> > @@ -2101,13 +2104,11 @@ static int kvm_init(MachineState *ms)
> > * encryption context.
> > */
> > if (ms->memory_encryption) {
> > - kvm_state->memcrypt_handle = sev_guest_init(ms->memory_encryption);
> > - if (!kvm_state->memcrypt_handle) {
> > + kvm_state->guest_memory_protection =
> > sev_guest_init(ms->memory_encryption);
> > + if (!kvm_state->guest_memory_protection) {
> > ret = -1;
> > goto err;
> > }
> > -
> > - kvm_state->memcrypt_encrypt_data = sev_encrypt_data;
> > }
> >
> > ret = kvm_arch_init(ms, s);
> > diff --git a/accel/kvm/sev-stub.c b/accel/kvm/sev-stub.c
> > index 4f97452585..4a5cc5569e 100644
> > --- a/accel/kvm/sev-stub.c
> > +++ b/accel/kvm/sev-stub.c
> > @@ -15,11 +15,6 @@
> > #include "qemu-common.h"
> > #include "sysemu/sev.h"
> >
> > -int sev_encrypt_data(void *handle, uint8_t *ptr, uint64_t len)
> > -{
> > - abort();
> > -}
> > -
> > void *sev_guest_init(const char *id)
> > {
> > return NULL;
>
> This requires some extra care:
>
> accel/kvm/sev-stub.c:18:7: error: conflicting types for ‘sev_guest_init’
> void *sev_guest_init(const char *id)
> ^~~~~~~~~~~~~~
> In file included from accel/kvm/sev-stub.c:16:0:
> include/sysemu/sev.h:21:24: note: previous declaration of ‘sev_guest_init’
> was here
> GuestMemoryProtection *sev_guest_init(const char *id);
> ^~~~~~~~~~~~~~
> rules.mak:69: recipe for target 'accel/kvm/sev-stub.o' failed
Oops, that's embarrassing - I forgot to do a build on ppc.
Fixed now.
> > diff --git a/include/exec/guest-memory-protection.h
> > b/include/exec/guest-memory-protection.h
> > index 38e9b01667..eb712a5804 100644
> > --- a/include/exec/guest-memory-protection.h
> > +++ b/include/exec/guest-memory-protection.h
> > @@ -30,6 +30,8 @@ typedef struct GuestMemoryProtection
> > GuestMemoryProtection;
> >
> > typedef struct GuestMemoryProtectionClass {
> > InterfaceClass parent;
> > +
> > + int (*encrypt_data)(GuestMemoryProtection *, uint8_t *, uint64_t);
> > } GuestMemoryProtectionClass;
> >
> > #endif /* QEMU_GUEST_MEMORY_PROTECTION_H */
> > diff --git a/include/sysemu/sev.h b/include/sysemu/sev.h
> > index 98c1ec8d38..7735a7942e 100644
> > --- a/include/sysemu/sev.h
> > +++ b/include/sysemu/sev.h
> > @@ -16,6 +16,8 @@
> >
> > #include "sysemu/kvm.h"
> >
> > -void *sev_guest_init(const char *id);
> > -int sev_encrypt_data(void *handle, uint8_t *ptr, uint64_t len);
> > +typedef struct GuestMemoryProtection GuestMemoryProtection;
> > +
> > +GuestMemoryProtection *sev_guest_init(const char *id);
> > +
> > #endif
> > diff --git a/target/i386/sev.c b/target/i386/sev.c
> > index d273174ad3..986c2fee51 100644
> > --- a/target/i386/sev.c
> > +++ b/target/i386/sev.c
> > @@ -28,6 +28,7 @@
> > #include "sysemu/runstate.h"
> > #include "trace.h"
> > #include "migration/blocker.h"
> > +#include "exec/guest-memory-protection.h"
> >
> > #define TYPE_SEV_GUEST "sev-guest"
> > #define SEV_GUEST(obj) \
> > @@ -281,26 +282,6 @@ sev_guest_set_sev_device(Object *obj, const char
> > *value, Error **errp)
> > sev->sev_device = g_strdup(value);
> > }
> >
> > -static void
> > -sev_guest_class_init(ObjectClass *oc, void *data)
> > -{
> > - object_class_property_add_str(oc, "sev-device",
> > - sev_guest_get_sev_device,
> > - sev_guest_set_sev_device);
> > - object_class_property_set_description(oc, "sev-device",
> > - "SEV device to use");
> > - object_class_property_add_str(oc, "dh-cert-file",
> > - sev_guest_get_dh_cert_file,
> > - sev_guest_set_dh_cert_file);
> > - object_class_property_set_description(oc, "dh-cert-file",
> > - "guest owners DH certificate (encoded with base64)");
> > - object_class_property_add_str(oc, "session-file",
> > - sev_guest_get_session_file,
> > - sev_guest_set_session_file);
> > - object_class_property_set_description(oc, "session-file",
> > - "guest owners session parameters (encoded with base64)");
> > -}
> > -
> > static void
> > sev_guest_instance_init(Object *obj)
> > {
> > @@ -319,20 +300,6 @@ sev_guest_instance_init(Object *obj)
> > OBJ_PROP_FLAG_READWRITE);
> > }
> >
> > -/* sev guest info */
> > -static const TypeInfo sev_guest_info = {
> > - .parent = TYPE_OBJECT,
> > - .name = TYPE_SEV_GUEST,
> > - .instance_size = sizeof(SevGuestState),
> > - .instance_finalize = sev_guest_finalize,
> > - .class_init = sev_guest_class_init,
> > - .instance_init = sev_guest_instance_init,
> > - .interfaces = (InterfaceInfo[]) {
> > - { TYPE_USER_CREATABLE },
> > - { }
> > - }
> > -};
> > -
> > static SevGuestState *
> > lookup_sev_guest_info(const char *id)
> > {
> > @@ -670,7 +637,7 @@ sev_vm_state_change(void *opaque, int running, RunState
> > state)
> > }
> > }
> >
> > -void *
> > +GuestMemoryProtection *
> > sev_guest_init(const char *id)
> > {
> > SevGuestState *sev;
> > @@ -748,16 +715,16 @@ sev_guest_init(const char *id)
> > qemu_add_machine_init_done_notifier(&sev_machine_done_notify);
> > qemu_add_vm_change_state_handler(sev_vm_state_change, sev);
> >
> > - return sev;
> > + return GUEST_MEMORY_PROTECTION(sev);
> > err:
> > sev_guest = NULL;
> > return NULL;
> > }
> >
> > -int
> > -sev_encrypt_data(void *handle, uint8_t *ptr, uint64_t len)
> > +static int
> > +sev_encrypt_data(GuestMemoryProtection *opaque, uint8_t *ptr, uint64_t len)
> > {
> > - SevGuestState *sev = handle;
> > + SevGuestState *sev = SEV_GUEST(opaque);
> >
> > assert(sev);
> >
> > @@ -769,6 +736,45 @@ sev_encrypt_data(void *handle, uint8_t *ptr, uint64_t
> > len)
> > return 0;
> > }
> >
> > +static void
> > +sev_guest_class_init(ObjectClass *oc, void *data)
> > +{
> > + GuestMemoryProtectionClass *gmpc = GUEST_MEMORY_PROTECTION_CLASS(oc);
> > +
> > + object_class_property_add_str(oc, "sev-device",
> > + sev_guest_get_sev_device,
> > + sev_guest_set_sev_device);
> > + object_class_property_set_description(oc, "sev-device",
> > + "SEV device to use");
> > + object_class_property_add_str(oc, "dh-cert-file",
> > + sev_guest_get_dh_cert_file,
> > + sev_guest_set_dh_cert_file);
> > + object_class_property_set_description(oc, "dh-cert-file",
> > + "guest owners DH certificate (encoded with base64)");
> > + object_class_property_add_str(oc, "session-file",
> > + sev_guest_get_session_file,
> > + sev_guest_set_session_file);
> > + object_class_property_set_description(oc, "session-file",
> > + "guest owners session parameters (encoded with base64)");
> > +
> > + gmpc->encrypt_data = sev_encrypt_data;
> > +}
> > +
> > +/* sev guest info */
> > +static const TypeInfo sev_guest_info = {
> > + .parent = TYPE_OBJECT,
> > + .name = TYPE_SEV_GUEST,
> > + .instance_size = sizeof(SevGuestState),
> > + .instance_finalize = sev_guest_finalize,
> > + .class_init = sev_guest_class_init,
> > + .instance_init = sev_guest_instance_init,
> > + .interfaces = (InterfaceInfo[]) {
> > + { TYPE_GUEST_MEMORY_PROTECTION },
> > + { TYPE_USER_CREATABLE },
> > + { }
> > + }
> > +};
> > +
> > static void
> > sev_register_types(void)
> > {
>
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
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