https://bugs.kde.org/show_bug.cgi?id=470978
Bug ID: 470978
Summary: s390x: Valgrind cannot start qemu-kvm when "sysctl
vm.allocate_pgste=0"
Classification: Developer tools
Product: valgrind
Version: unspecified
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: jsew...@acm.org
Reporter: ar...@linux.ibm.com
Target Milestone: ---
qemu-kvm needs the PGSTE mode to be enabled by the kernel. The kernel activates
this mode upon exec() when recognizing the s390-specific ELF section
PT_S390_PGSTE. Another option is to activate the mode for the whole system
(with performance penalty) with the sysctl setting `vm.allocate_psgte'.
But when the system-wide setting is not enabled and qemu-kvm is run under
Valgrind, the PGSTE mode will not be enabled, leading to a failure like this:
ioctl(KVM_CREATE_VM) failed: 22 Invalid argument
Host kernel setup problem detected. Please verify:
- for kernels supporting the switch_amode or user_mode parameters, whether
user space is running in primary address space
- for kernels supporting the vm.allocate_pgste sysctl, whether it is enabled
qemu-kvm: failed to initialize kvm: Invalid argument
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