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Re: [Qemu-devel] [PATCH v3 10/14] target/i386: sev: add support to load
From: |
Dr. David Alan Gilbert |
Subject: |
Re: [Qemu-devel] [PATCH v3 10/14] target/i386: sev: add support to load incoming encrypted page |
Date: |
Tue, 13 Aug 2019 18:38:55 +0100 |
User-agent: |
Mutt/1.12.1 (2019-06-15) |
* Singh, Brijesh (address@hidden) wrote:
> The sev_load_incoming_page() provide the implementation to read the
> incoming guest private pages from the socket and load it into the guest
> memory. The routines uses the RECEIVE_START command to create the
> incoming encryption context on the first call then uses the
> RECEIEVE_UPDATE_DATA command to load the encrypted pages into the guest
> memory. After migration is completed, we issue the RECEIVE_FINISH command
> to transition the SEV guest to the runnable state so that it can be
> executed.
>
> Signed-off-by: Brijesh Singh <address@hidden>
OK, some comments about the return values of the functions would help,
but other than that.
Reviewed-by: Dr. David Alan Gilbert <address@hidden>
> ---
> accel/kvm/kvm-all.c | 6 ++
> accel/kvm/sev-stub.c | 5 ++
> include/sysemu/sev.h | 1 +
> target/i386/sev.c | 137 ++++++++++++++++++++++++++++++++++++++-
> target/i386/trace-events | 3 +
> 5 files changed, 151 insertions(+), 1 deletion(-)
>
> diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c
> index a5b0ae9363..ba0e7fa2be 100644
> --- a/accel/kvm/kvm-all.c
> +++ b/accel/kvm/kvm-all.c
> @@ -180,9 +180,15 @@ static int kvm_memcrypt_save_outgoing_page(QEMUFile *f,
> uint8_t *ptr,
> bytes_sent);
> }
>
> +static int kvm_memcrypt_load_incoming_page(QEMUFile *f, uint8_t *ptr)
> +{
> + return sev_load_incoming_page(kvm_state->memcrypt_handle, f, ptr);
> +}
> +
> static struct MachineMemoryEncryptionOps sev_memory_encryption_ops = {
> .save_setup = kvm_memcrypt_save_setup,
> .save_outgoing_page = kvm_memcrypt_save_outgoing_page,
> + .load_incoming_page = kvm_memcrypt_load_incoming_page,
> };
>
> int kvm_memcrypt_encrypt_data(uint8_t *ptr, uint64_t len)
> diff --git a/accel/kvm/sev-stub.c b/accel/kvm/sev-stub.c
> index 51b17b8141..1b6773ef72 100644
> --- a/accel/kvm/sev-stub.c
> +++ b/accel/kvm/sev-stub.c
> @@ -36,3 +36,8 @@ int sev_save_outgoing_page(void *handle, QEMUFile *f,
> uint8_t *ptr,
> {
> return 1;
> }
> +
> +int sev_load_incoming_page(void *handle, QEMUFile *f, uint8_t *ptr)
> +{
> + return 1;
> +}
> diff --git a/include/sysemu/sev.h b/include/sysemu/sev.h
> index f06fd203cd..e9371bd2dd 100644
> --- a/include/sysemu/sev.h
> +++ b/include/sysemu/sev.h
> @@ -22,4 +22,5 @@ int sev_save_setup(void *handle, const char *pdh, const
> char *plat_cert,
> const char *amd_cert);
> int sev_save_outgoing_page(void *handle, QEMUFile *f, uint8_t *ptr,
> uint32_t size, uint64_t *bytes_sent);
> +int sev_load_incoming_page(void *handle, QEMUFile *f, uint8_t *ptr);
> #endif
> diff --git a/target/i386/sev.c b/target/i386/sev.c
> index 1820c62a71..a689011991 100644
> --- a/target/i386/sev.c
> +++ b/target/i386/sev.c
> @@ -721,13 +721,34 @@ sev_launch_finish(SEVState *s)
> }
> }
>
> +static int
> +sev_receive_finish(SEVState *s)
> +{
> + int error, ret = 1;
> +
> + trace_kvm_sev_receive_finish();
> + ret = sev_ioctl(s->sev_fd, KVM_SEV_RECEIVE_FINISH, 0, &error);
> + if (ret) {
> + error_report("%s: RECEIVE_FINISH ret=%d fw_error=%d '%s'",
> + __func__, ret, error, fw_error_to_str(error));
> + goto err;
> + }
> +
> + sev_set_guest_state(SEV_STATE_RUNNING);
> +err:
> + return ret;
> +}
> +
> +
> static void
> sev_vm_state_change(void *opaque, int running, RunState state)
> {
> SEVState *s = opaque;
>
> if (running) {
> - if (!sev_check_state(SEV_STATE_RUNNING)) {
> + if (sev_check_state(SEV_STATE_RECEIVE_UPDATE)) {
> + sev_receive_finish(s);
> + } else if (!sev_check_state(SEV_STATE_RUNNING)) {
> sev_launch_finish(s);
> }
> }
> @@ -1097,6 +1118,120 @@ int sev_save_outgoing_page(void *handle, QEMUFile *f,
> uint8_t *ptr,
> return sev_send_update_data(s, f, ptr, sz, bytes_sent);
> }
>
> +static int
> +sev_receive_start(QSevGuestInfo *sev, QEMUFile *f)
> +{
> + int ret = 1;
> + int fw_error;
> + struct kvm_sev_receive_start start = { };
> + gchar *session = NULL, *pdh_cert = NULL;
> +
> + /* get SEV guest handle */
> + start.handle = object_property_get_int(OBJECT(sev), "handle",
> + &error_abort);
> +
> + /* get the source policy */
> + start.policy = qemu_get_be32(f);
> +
> + /* get source PDH key */
> + start.pdh_len = qemu_get_be32(f);
> + if (!check_blob_length(start.pdh_len)) {
> + return 1;
> + }
> +
> + pdh_cert = g_new(gchar, start.pdh_len);
> + qemu_get_buffer(f, (uint8_t *)pdh_cert, start.pdh_len);
> + start.pdh_uaddr = (uintptr_t)pdh_cert;
> +
> + /* get source session data */
> + start.session_len = qemu_get_be32(f);
> + if (!check_blob_length(start.session_len)) {
> + return 1;
> + }
> + session = g_new(gchar, start.session_len);
> + qemu_get_buffer(f, (uint8_t *)session, start.session_len);
> + start.session_uaddr = (uintptr_t)session;
> +
> + trace_kvm_sev_receive_start(start.policy, session, pdh_cert);
> +
> + ret = sev_ioctl(sev_state->sev_fd, KVM_SEV_RECEIVE_START,
> + &start, &fw_error);
> + if (ret < 0) {
> + error_report("Error RECEIVE_START ret=%d fw_error=%d '%s'",
> + ret, fw_error, fw_error_to_str(fw_error));
> + goto err;
> + }
> +
> + object_property_set_int(OBJECT(sev), start.handle, "handle",
> &error_abort);
> + sev_set_guest_state(SEV_STATE_RECEIVE_UPDATE);
> +err:
> + g_free(session);
> + g_free(pdh_cert);
> +
> + return ret;
> +}
> +
> +static int sev_receive_update_data(QEMUFile *f, uint8_t *ptr)
> +{
> + int ret = 1, fw_error = 0;
> + gchar *hdr = NULL, *trans = NULL;
> + struct kvm_sev_receive_update_data update = {};
> +
> + /* get packet header */
> + update.hdr_len = qemu_get_be32(f);
> + if (!check_blob_length(update.hdr_len)) {
> + return 1;
> + }
> +
> + hdr = g_new(gchar, update.hdr_len);
> + qemu_get_buffer(f, (uint8_t *)hdr, update.hdr_len);
> + update.hdr_uaddr = (uintptr_t)hdr;
> +
> + /* get transport buffer */
> + update.trans_len = qemu_get_be32(f);
> + if (!check_blob_length(update.trans_len)) {
> + goto err;
> + }
> +
> + trans = g_new(gchar, update.trans_len);
> + update.trans_uaddr = (uintptr_t)trans;
> + qemu_get_buffer(f, (uint8_t *)update.trans_uaddr, update.trans_len);
> +
> + update.guest_uaddr = (uintptr_t) ptr;
> + update.guest_len = update.trans_len;
> +
> + trace_kvm_sev_receive_update_data(trans, ptr, update.guest_len,
> + hdr, update.hdr_len);
> +
> + ret = sev_ioctl(sev_state->sev_fd, KVM_SEV_RECEIVE_UPDATE_DATA,
> + &update, &fw_error);
> + if (ret) {
> + error_report("Error RECEIVE_UPDATE_DATA ret=%d fw_error=%d '%s'",
> + ret, fw_error, fw_error_to_str(fw_error));
> + goto err;
> + }
> +err:
> + g_free(trans);
> + g_free(hdr);
> + return ret;
> +}
> +
> +int sev_load_incoming_page(void *handle, QEMUFile *f, uint8_t *ptr)
> +{
> + SEVState *s = (SEVState *)handle;
> +
> + /*
> + * If this is first buffer and SEV is not in recieiving state then
> + * use RECEIVE_START command to create a encryption context.
> + */
> + if (!sev_check_state(SEV_STATE_RECEIVE_UPDATE) &&
> + sev_receive_start(s->sev_info, f)) {
> + return 1;
> + }
> +
> + return sev_receive_update_data(f, ptr);
> +}
> +
> static void
> sev_register_types(void)
> {
> diff --git a/target/i386/trace-events b/target/i386/trace-events
> index b41516cf9f..609752cca7 100644
> --- a/target/i386/trace-events
> +++ b/target/i386/trace-events
> @@ -18,3 +18,6 @@ kvm_sev_launch_finish(void) ""
> kvm_sev_send_start(uint64_t pdh, int l1, uint64_t plat, int l2, uint64_t
> amd, int l3) "pdh 0x%" PRIx64 " len %d plat 0x%" PRIx64 " len %d amd 0x%"
> PRIx64 " len %d"
> kvm_sev_send_update_data(void *src, void *dst, int len) "guest %p trans %p
> len %d"
> kvm_sev_send_finish(void) ""
> +kvm_sev_receive_start(int policy, void *session, void *pdh) "policy 0x%x
> session %p pdh %p"
> +kvm_sev_receive_update_data(void *src, void *dst, int len, void *hdr, int
> hdr_len) "guest %p trans %p len %d hdr %p hdr_len %d"
> +kvm_sev_receive_finish(void) ""
> --
> 2.17.1
>
--
Dr. David Alan Gilbert / address@hidden / Manchester, UK
- Re: [Qemu-devel] [PATCH v3 05/14] hw/machine: add helper to query the memory encryption state, (continued)
- [Qemu-devel] [PATCH v3 02/14] doc: update AMD SEV to include Live migration flow, Singh, Brijesh, 2019/08/06
- [Qemu-devel] [PATCH v3 08/14] target/i386: sev: do not create launch context for an incoming guest, Singh, Brijesh, 2019/08/06
- [Qemu-devel] [PATCH v3 07/14] target/i386: sev: provide callback to setup outgoing context, Singh, Brijesh, 2019/08/06
- [Qemu-devel] [PATCH v3 06/14] hw/machine: introduce MachineMemoryEncryptionOps for encrypted VMs, Singh, Brijesh, 2019/08/06
- [Qemu-devel] [PATCH v3 10/14] target/i386: sev: add support to load incoming encrypted page, Singh, Brijesh, 2019/08/06
- Re: [Qemu-devel] [PATCH v3 10/14] target/i386: sev: add support to load incoming encrypted page,
Dr. David Alan Gilbert <=
- [Qemu-devel] [PATCH v3 09/14] target/i386: sev: add support to encrypt the outgoing page, Singh, Brijesh, 2019/08/06
- [Qemu-devel] [PATCH v3 13/14] migration/ram: add support to send encrypted pages, Singh, Brijesh, 2019/08/06
- [Qemu-devel] [PATCH v3 11/14] migration: add support to migrate page encryption bitmap, Singh, Brijesh, 2019/08/06
- [Qemu-devel] [PATCH v3 14/14] target/i386: sev: remove migration blocker, Singh, Brijesh, 2019/08/06
- [Qemu-devel] [PATCH v3 12/14] kvm: add support to sync the page encryption state bitmap, Singh, Brijesh, 2019/08/06