Changelog:
v2
• QEMU now handles the instruction call
- as such, the "enable diag 318" IOCTL has been removed
• patch #1 now changes the read scp/cpu info functions to
retrieve the machine state once
- as such, I have not added any ack's or r-bs since this
patch differs from the previous version
• patch #3 introduces a new "get_read_scp_info_data_len"
function in order clean-up the variable data length assignment
in patch #7
- a comment above this function should help clarify what's
going on to make things a bit easier to read
• other misc clean ups and fixes
- s/diag318/diag_318 in order to keep the naming scheme
consistent with Linux and other diag-related code
- s/byte_134/fac134 to align naming scheme with Linux
-----------------------------------------------------------------------
This patch series introduces two features for an s390 KVM quest:
- Extended-Length SCCB (els) for the Read SCP/CPU Info SCLP
commands
- DIAGNOSE 0x318 (diag_318) enabling / migration handling
The diag 318 feature depends on els and KVM support.
The els feature is handled entirely with QEMU, and does not require
KVM support.
Both features are made available starting with the zEC12-full model.
These patches are introduced together for two main reasons:
- els allows diag 318 to exist while retaining the original 248
VCPU max
- diag 318 is presented to show how els is useful
Full els support is dependant on the Linux kernel, which must react
to the SCLP response code and set an appropriate-length SCCB.
A user should take care when tuning the CPU model for a VM.
If a user defines a VM with els support and specifies 248 CPUs, but
the guest Linux kernel cannot react to the SCLP response code, then
the guest will crash immediately upon kernel startup.
Collin L. Walling (8):
s390/sclp: get machine once during read scp/cpu info
s390/sclp: check sccb len before filling in data
s390/sclp: rework sclp boundary and length checks
s390/sclp: read sccb from mem based on sccb length
s390/sclp: use cpu offset to locate cpu entries
s390/sclp: add extended-length sccb support for kvm guest
s390/kvm: header sync for diag318
s390: guest support for diagnose 0x318
hw/s390x/s390-virtio-ccw.c | 45 +++++++++++
hw/s390x/sclp.c | 117 ++++++++++++++++++++++------
include/hw/s390x/s390-virtio-ccw.h | 1 +
include/hw/s390x/sclp.h | 4 +
linux-headers/asm-s390/kvm.h | 4 +
target/s390x/cpu.c | 23 ++++++
target/s390x/cpu.h | 4 +
target/s390x/cpu_features.h | 1 +
target/s390x/cpu_features_def.inc.h | 4 +
target/s390x/cpu_models.c | 1 +
target/s390x/gen-features.c | 2 +
target/s390x/kvm-stub.c | 10 +++
target/s390x/kvm.c | 44 +++++++++++
target/s390x/kvm_s390x.h | 2 +
14 files changed, 237 insertions(+), 25 deletions(-)
--
2.21.3
