On 12/4/19 11:48 AM, Thomas Huth wrote: > On 29/11/2019 10.47, Janosch Frank wrote: >> When a guest has saved a ipib of type 5 and call diagnose308 with >> subcode 10, we have to setup the protected processing environment via >> Ultravisor calls. The calls are done by KVM and are exposed via an API. >> >> The following steps are necessary: >> 1. Create a VM (register it with the Ultravisor) >> 2. Create secure CPUs for all of our current cpus >> 3. Forward the secure header to the Ultravisor (has all information on >> how to decrypt the image and VM information) >> 4. Protect image pages from the host and decrypt them >> 5. Verify the image integrity >> >> Only after step 5 a protected VM is allowed to run. >> >> Signed-off-by: Janosch Frank <[email protected]> >> --- > [...] >> +++ b/hw/s390x/pv.c >> @@ -0,0 +1,118 @@ >> +/* >> + * Secure execution functions >> + * >> + * Copyright IBM Corp. 2019 >> + * Author(s): >> + * Janosch Frank <[email protected]> >> + * >> + * This work is licensed under the terms of the GNU GPL, version 2 or (at >> + * your option) any later version. See the COPYING file in the top-level >> + * directory. >> + */ >> +#include "qemu/osdep.h" >> +#include <sys/ioctl.h> >> + >> +#include <linux/kvm.h> >> + >> +#include "qemu/error-report.h" >> +#include "sysemu/kvm.h" >> +#include "pv.h" >> + >> +static int s390_pv_cmd(uint32_t cmd, void *data) >> +{ >> + int rc; >> + struct kvm_pv_cmd pv_cmd = { >> + .cmd = cmd, >> + .data = (uint64_t)data, >> + }; >> + >> + rc = kvm_vm_ioctl(kvm_state, KVM_S390_PV_COMMAND, &pv_cmd); >> + if (rc) { >> + error_report("KVM PV command failed cmd: %d rc: %d", cmd, rc); >> + exit(1); >> + } >> + return rc; >> +} >> + >> +static int s390_pv_cmd_vcpu(CPUState *cs, uint32_t cmd, void *data) >> +{ >> + int rc; >> + struct kvm_pv_cmd pv_cmd = { >> + .cmd = cmd, >> + .data = (uint64_t)data, >> + }; >> + >> + rc = kvm_vcpu_ioctl(cs, KVM_S390_PV_COMMAND_VCPU, &pv_cmd); >> + if (rc) { >> + error_report("KVM PV VCPU command failed cmd: %d rc: %d", cmd, rc); >> + exit(1); >> + } >> + return rc; >> +} >> + >> +int s390_pv_vm_create(void) >> +{ >> + return s390_pv_cmd(KVM_PV_VM_CREATE, NULL); >> +} >> + >> +int s390_pv_vm_destroy(void) >> +{ >> + return s390_pv_cmd(KVM_PV_VM_DESTROY, NULL); >> +} >> + >> +int s390_pv_vcpu_create(CPUState *cs) >> +{ >> + return s390_pv_cmd_vcpu(cs, KVM_PV_VCPU_CREATE, NULL); >> +} >> + >> +int s390_pv_vcpu_destroy(CPUState *cs) >> +{ >> + S390CPU *cpu = S390_CPU(cs); >> + CPUS390XState *env = &cpu->env; >> + int rc; >> + >> + rc = s390_pv_cmd_vcpu(cs, KVM_PV_VCPU_DESTROY, NULL); >> + if (!rc) { >> + env->pv = false; >> + } >> + return rc; >> +} >> + >> +int s390_pv_set_sec_parms(uint64_t origin, uint64_t length) >> +{ >> + struct kvm_s390_pv_sec_parm args = { >> + .origin = origin, >> + .length = length, >> + }; >> + >> + return s390_pv_cmd(KVM_PV_VM_SET_SEC_PARMS, &args); >> +} >> + >> +/* >> + * Called for each component in the SE type IPL parameter block 0. >> + */ >> +int s390_pv_unpack(uint64_t addr, uint64_t size, uint64_t tweak) >> +{ >> + struct kvm_s390_pv_unp args = { >> + .addr = addr, >> + .size = size, >> + .tweak = tweak, >> + }; >> + >> + return s390_pv_cmd(KVM_PV_VM_UNPACK, &args); >> +} >> + >> +int s390_pv_perf_clear_reset(void) >> +{ >> + return s390_pv_cmd(KVM_PV_VM_PERF_CLEAR_RESET, NULL); >> +} >> + >> +int s390_pv_verify(void) >> +{ >> + return s390_pv_cmd(KVM_PV_VM_VERIFY, NULL); >> +} >> + >> +int s390_pv_unshare(void) >> +{ >> + return s390_pv_cmd(KVM_PV_VM_UNSHARE, NULL); >> +} >> diff --git a/hw/s390x/pv.h b/hw/s390x/pv.h >> new file mode 100644 >> index 0000000000..eb074e4bc9 >> --- /dev/null >> +++ b/hw/s390x/pv.h >> @@ -0,0 +1,26 @@ >> +/* >> + * Protected Virtualization header >> + * >> + * Copyright IBM Corp. 2019 >> + * Author(s): >> + * Janosch Frank <[email protected]> >> + * >> + * This work is licensed under the terms of the GNU GPL, version 2 or (at >> + * your option) any later version. See the COPYING file in the top-level >> + * directory. >> + */ >> + >> +#ifndef HW_S390_PV_H >> +#define HW_S390_PV_H >> + >> +int s390_pv_vm_create(void); >> +int s390_pv_vm_destroy(void); >> +int s390_pv_vcpu_destroy(CPUState *cs); >> +int s390_pv_vcpu_create(CPUState *cs); >> +int s390_pv_set_sec_parms(uint64_t origin, uint64_t length); >> +int s390_pv_unpack(uint64_t addr, uint64_t size, uint64_t tweak); >> +int s390_pv_perf_clear_reset(void); >> +int s390_pv_verify(void); >> +int s390_pv_unshare(void); > > I still think you should make all those functions returning "void" > instead of "int" - since errors results in an exit() in s390_pv_cmd() > and s390_pv_cmd_vcpu() anyway...
Hey Thomas,
I have requested an error code for diag 308 subcode 10 that tells the
VM, that we didn't succeed starting a secure guest. Once that is in
place, I'll need to check the return codes.
Although I'm a bit unsure how I should hook that up because of the
diag308/reset handler split.
>
>> +
>> +#endif /* HW_S390_PV_H */
>> diff --git a/hw/s390x/s390-virtio-ccw.c b/hw/s390x/s390-virtio-ccw.c
>> index c1d1440272..f9481ccace 100644
>> --- a/hw/s390x/s390-virtio-ccw.c
>> +++ b/hw/s390x/s390-virtio-ccw.c
>> @@ -41,6 +41,7 @@
>> #include "hw/qdev-properties.h"
>> #include "hw/s390x/tod.h"
>> #include "sysemu/sysemu.h"
>> +#include "hw/s390x/pv.h"
>>
>> S390CPU *s390_cpu_addr2state(uint16_t cpu_addr)
>> {
>> @@ -322,6 +323,7 @@ static void s390_machine_reset(MachineState *machine)
>> {
>> enum s390_reset reset_type;
>> CPUState *cs, *t;
>> + S390CPU *cpu;
>>
>> /* get the reset parameters, reset them once done */
>> s390_ipl_get_reset_request(&cs, &reset_type);
>> @@ -329,6 +331,8 @@ static void s390_machine_reset(MachineState *machine)
>> /* all CPUs are paused and synchronized at this point */
>> s390_cmma_reset();
>>
>> + cpu = S390_CPU(cs);
>> +
>> switch (reset_type) {
>> case S390_RESET_EXTERNAL:
>> case S390_RESET_REIPL:
>> @@ -357,6 +361,28 @@ static void s390_machine_reset(MachineState *machine)
>> run_on_cpu(cs, s390_do_cpu_initial_reset, RUN_ON_CPU_NULL);
>> run_on_cpu(cs, s390_do_cpu_load_normal, RUN_ON_CPU_NULL);
>> break;
>> + case S390_RESET_PV: /* Subcode 10 */
>> + subsystem_reset();
>> + s390_crypto_reset();
>> +
>> + CPU_FOREACH(t) {
>> + run_on_cpu(t, s390_do_cpu_full_reset, RUN_ON_CPU_NULL);
>> + }
>> +
>> + /* Create SE VM */
>> + s390_pv_vm_create();
>> + CPU_FOREACH(t) {
>> + s390_pv_vcpu_create(t);
>> + }
>> +
>> + /* Set SE header and unpack */
>> + s390_ipl_prepare_pv_header();
>> + /* Decrypt image */
>> + s390_ipl_pv_unpack();
>> + /* Verify integrity */
>> + s390_pv_verify();
>> + s390_cpu_set_state(S390_CPU_STATE_OPERATING, cpu);
>> + break;
>
> ... and here you completely ignore the return codes of all the new
> functions.
>
> Thomas
>
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