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| author | Janosch Frank <frankja@linux.ibm.com> | 2022-05-17 19:36:24 +0300 |
|---|---|---|
| committer | Christian Borntraeger <borntraeger@linux.ibm.com> | 2022-06-01 17:57:14 +0300 |
| commit | 0460eb35b443f73f8a8e3be1ea87bd690a852e20 (patch) | |
| tree | 09114e8e47847cf99c7fcae4e1201fb87c094089 /arch/s390/kvm/kvm-s390.h | |
| parent | fe9a93e07ba4f29def2f8a4318b63e0c70a5c6c2 (diff) | |
| download | linux-0460eb35b443f73f8a8e3be1ea87bd690a852e20.tar.xz | |
KVM: s390: Add configuration dump functionality
Sometimes dumping inside of a VM fails, is unavailable or doesn't
yield the required data. For these occasions we dump the VM from the
outside, writing memory and cpu data to a file.
Up to now PV guests only supported dumping from the inside of the
guest through dumpers like KDUMP. A PV guest can be dumped from the
hypervisor but the data will be stale and / or encrypted.
To get the actual state of the PV VM we need the help of the
Ultravisor who safeguards the VM state. New UV calls have been added
to initialize the dump, dump storage state data, dump cpu data and
complete the dump process. We expose these calls in this patch via a
new UV ioctl command.
The sensitive parts of the dump data are encrypted, the dump key is
derived from the Customer Communication Key (CCK). This ensures that
only the owner of the VM who has the CCK can decrypt the dump data.
The memory is dumped / read via a normal export call and a re-import
after the dump initialization is not needed (no re-encryption with a
dump key).
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Link: https://lore.kernel.org/r/20220517163629.3443-7-frankja@linux.ibm.com
Message-Id: <20220517163629.3443-7-frankja@linux.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@linux.ibm.com>
Diffstat (limited to 'arch/s390/kvm/kvm-s390.h')
| -rw-r--r-- | arch/s390/kvm/kvm-s390.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/s390/kvm/kvm-s390.h b/arch/s390/kvm/kvm-s390.h index 497d52a83c78..2c11eb5ba3ef 100644 --- a/arch/s390/kvm/kvm-s390.h +++ b/arch/s390/kvm/kvm-s390.h @@ -250,6 +250,10 @@ int kvm_s390_pv_set_sec_parms(struct kvm *kvm, void *hdr, u64 length, u16 *rc, int kvm_s390_pv_unpack(struct kvm *kvm, unsigned long addr, unsigned long size, unsigned long tweak, u16 *rc, u16 *rrc); int kvm_s390_pv_set_cpu_state(struct kvm_vcpu *vcpu, u8 state); +int kvm_s390_pv_dump_stor_state(struct kvm *kvm, void __user *buff_user, + u64 *gaddr, u64 buff_user_len, u16 *rc, u16 *rrc); +int kvm_s390_pv_dump_complete(struct kvm *kvm, void __user *buff_user, + u16 *rc, u16 *rrc); static inline u64 kvm_s390_pv_get_handle(struct kvm *kvm) { |