Re: [PATCH 03/15] s390x: protvirt: Add diag308 subcodes 8 - 10

[Cornelia Huck <cohuck@redhat.com>]

On Wed, 20 Nov 2019 06:43:22 -0500
Janosch Frank <frankja@linux.ibm.com> wrote:

> For diag308 subcodes 8 - 10 we have a new ipib of type 5. The ipib
> holds the address and length of the secure execution header, as well
> as a list of guest components.
> 
> Each component is a block of memory, for example kernel or initrd,
> which needs to be decrypted by the Ultravisor in order to run a
> protected VM. The secure execution header instructs the Ultravisor on
> how to handle the protected VM and its components.
> 
> Subcodes 8 and 9 are similiar to 5 and 6 and subcode 10 will finally
> start the protected guest.
> 
> Subcodes 8-10 are not valid in protected mode, we have to do a subcode
> 3 and then the 8 and 10 combination for a protected reboot.
> 
> Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
> ---
>  hw/s390x/ipl.c      | 48 ++++++++++++++++++++++++++++++++++++++++++---
>  hw/s390x/ipl.h      | 33 +++++++++++++++++++++++++++++++
>  target/s390x/diag.c | 26 ++++++++++++++++++++++--
>  3 files changed, 102 insertions(+), 5 deletions(-)
> 
> diff --git a/hw/s390x/ipl.c b/hw/s390x/ipl.c
> index ca544d64c5..a077926f36 100644
> --- a/hw/s390x/ipl.c
> +++ b/hw/s390x/ipl.c
> @@ -529,15 +529,56 @@ static bool is_virtio_scsi_device(IplParameterBlock *iplb)
>      return is_virtio_ccw_device_of_type(iplb, VIRTIO_ID_SCSI);
>  }
>  
> +int s390_ipl_pv_check_comp(IplParameterBlock *iplb)

s390_ipl_pv_check_components() ?

> +{
> +    int i;
> +    IPLBlockPV *ipib_pv = &iplb->pv;
> +
> +    if (ipib_pv->num_comp == 0) {
> +        return -EINVAL;
> +    }
> +
> +    for (i = 0; i < ipib_pv->num_comp; i++) {
> +
> +        /* Addr must be 4k aligned */
> +        if (ipib_pv->components[i].addr & ~TARGET_PAGE_MASK) {
> +            return -EINVAL;
> +        }
> +
> +        /* Tweak prefix is monotonously increasing with each component */
> +        if (i < ipib_pv->num_comp - 1 &&
> +            ipib_pv->components[i].tweak_pref >
> +            ipib_pv->components[i + 1].tweak_pref) {
> +            return -EINVAL;
> +        }
> +    }
> +    return 1;
> +}
> +

(...)

> @@ -185,4 +211,11 @@ static inline bool iplb_valid_fcp(IplParameterBlock *iplb)
>             iplb->pbt == S390_IPL_TYPE_FCP;
>  }
>  
> +static inline bool iplb_valid_se(IplParameterBlock *iplb)

iplb_valid_pv() ?

> +{
> +    return be32_to_cpu(iplb->len) >= S390_IPLB_MIN_PV_LEN &&
> +           iplb->pbt == S390_IPL_TYPE_PV;
> +}
> +
> +
>  #endif

(...)

> @@ -105,6 +110,7 @@ void handle_diag_308(CPUS390XState *env, uint64_t r1, uint64_t r3, uintptr_t ra)
>          s390_ipl_reset_request(cs, S390_RESET_REIPL);
>          break;
>      case DIAG308_SET:
> +    case DIAG308_PV_SET: /* Set SE parms */

PV parms?

('SE' makes me think of 'service element' :)

>          if (diag308_parm_check(env, r1, addr, ra, false)) {
>              return;
>          }
> @@ -117,7 +123,8 @@ void handle_diag_308(CPUS390XState *env, uint64_t r1, uint64_t r3, uintptr_t ra)
>  
>          cpu_physical_memory_read(addr, iplb, be32_to_cpu(iplb->len));
>  
> -        if (!iplb_valid_ccw(iplb) && !iplb_valid_fcp(iplb)) {
> +        if (!iplb_valid_ccw(iplb) && !iplb_valid_fcp(iplb) &&
> +            !(iplb_valid_se(iplb) && s390_ipl_pv_check_comp(iplb) >= 0)) {
>              env->regs[r1 + 1] = DIAG_308_RC_INVALID;
>              goto out;
>          }
> @@ -128,10 +135,15 @@ out:
>          g_free(iplb);
>          return;
>      case DIAG308_STORE:
> +    case DIAG308_PV_STORE: /* Get SE parms */

Same here.

>          if (diag308_parm_check(env, r1, addr, ra, true)) {
>              return;
>          }
> -        iplb = s390_ipl_get_iplb();
> +        if (subcode == DIAG308_PV_STORE) {
> +            iplb = s390_ipl_get_iplb_secure();
> +        } else {
> +            iplb = s390_ipl_get_iplb();
> +        }
>          if (iplb) {
>              cpu_physical_memory_write(addr, iplb, be32_to_cpu(iplb->len));
>              env->regs[r1 + 1] = DIAG_308_RC_OK;
> @@ -139,6 +151,16 @@ out:
>              env->regs[r1 + 1] = DIAG_308_RC_NO_CONF;
>          }
>          return;
> +        break;
> +    case DIAG308_PV_START: /* SE start */

Also here :)

> +        iplb = s390_ipl_get_iplb_secure();
> +        if (!iplb_valid_se(iplb)) {
> +            env->regs[r1 + 1] = DIAG_308_RC_NO_PV_CONF;
> +            return;
> +        }
> +
> +        s390_ipl_reset_request(cs, S390_RESET_PV);
> +        break;
>      default:
>          s390_program_interrupt(env, PGM_SPECIFICATION, ra);
>          break;

Did not spot anything else.