On 04/12/2019 12.32, Janosch Frank wrote: > 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.
Ok, but then the exit()s need to go away, I assume? Thomas
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