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| author | Christoph Schlameuss <schlameuss@linux.ibm.com> | 2024-06-24 12:59:02 +0300 |
|---|---|---|
| committer | Janosch Frank <frankja@linux.ibm.com> | 2024-07-04 10:07:24 +0300 |
| commit | 7816e58967d0e6cadce05c8540b47ed027dc2499 (patch) | |
| tree | c4de39745e80e7573fda393ee6c8b639726be169 /Documentation/virt/kvm | |
| parent | 33a729a1770b5e03b9dbc7ecb065ae7997b7544d (diff) | |
| download | linux-7816e58967d0e6cadce05c8540b47ed027dc2499.tar.xz | |
kvm: s390: Reject memory region operations for ucontrol VMs
This change rejects the KVM_SET_USER_MEMORY_REGION and
KVM_SET_USER_MEMORY_REGION2 ioctls when called on a ucontrol VM.
This is necessary since ucontrol VMs have kvm->arch.gmap set to 0 and
would thus result in a null pointer dereference further in.
Memory management needs to be performed in userspace and using the
ioctls KVM_S390_UCAS_MAP and KVM_S390_UCAS_UNMAP.
Also improve s390 specific documentation for KVM_SET_USER_MEMORY_REGION
and KVM_SET_USER_MEMORY_REGION2.
Signed-off-by: Christoph Schlameuss <schlameuss@linux.ibm.com>
Fixes: 27e0393f15fc ("KVM: s390: ucontrol: per vcpu address spaces")
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Link: https://lore.kernel.org/r/20240624095902.29375-1-schlameuss@linux.ibm.com
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
[frankja@linux.ibm.com: commit message spelling fix, subject prefix fix]
Message-ID: <20240624095902.29375-1-schlameuss@linux.ibm.com>
Diffstat (limited to 'Documentation/virt/kvm')
| -rw-r--r-- | Documentation/virt/kvm/api.rst | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst index a71d91978d9e..eec8df1dde06 100644 --- a/Documentation/virt/kvm/api.rst +++ b/Documentation/virt/kvm/api.rst @@ -1403,6 +1403,12 @@ Instead, an abort (data abort if the cause of the page-table update was a load or a store, instruction abort if it was an instruction fetch) is injected in the guest. +S390: +^^^^^ + +Returns -EINVAL if the VM has the KVM_VM_S390_UCONTROL flag set. +Returns -EINVAL if called on a protected VM. + 4.36 KVM_SET_TSS_ADDR --------------------- @@ -6273,6 +6279,12 @@ state. At VM creation time, all memory is shared, i.e. the PRIVATE attribute is '0' for all gfns. Userspace can control whether memory is shared/private by toggling KVM_MEMORY_ATTRIBUTE_PRIVATE via KVM_SET_MEMORY_ATTRIBUTES as needed. +S390: +^^^^^ + +Returns -EINVAL if the VM has the KVM_VM_S390_UCONTROL flag set. +Returns -EINVAL if called on a protected VM. + 4.141 KVM_SET_MEMORY_ATTRIBUTES ------------------------------- |