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KVM: s390: Document the KVM_CAP_S390_HPAGE_2G capability

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Document the KVM_CAP_S390_HPAGE_2G capability, which behaves very
similarly to the existing KVM_CAP_S390_HPAGE_1M.

Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Message-ID: <20260609150930.665370-5-imbrenda@linux.ibm.com>
This commit is contained in:
Claudio Imbrenda 2026-06-09 17:09:30 +02:00
parent 46756c0863
commit 9030da050c
1 changed files with 15 additions and 0 deletions
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Documentation/virt/kvm/api.rst
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@ -8905,6 +8905,21 @@ helpful if user space wants to emulate instructions which are not
This capability can be enabled dynamically even if VCPUs were already
created and are running.
7.47 KVM_CAP_S390_HPAGE_2G
--------------------------
:Architectures: s390
:Parameters: none
:Returns: 0 on success; -EINVAL if hpage_2g module parameter was not set,
cmma is enabled, or the VM has the KVM_VM_S390_UCONTROL
flag set; -EBUSY if vCPUs were already created for the VM.
With this capability the KVM support for memory backing with 2g pages
through hugetlbfs can be enabled for a VM. After the capability is
enabled, cmma can't be enabled anymore and pfmfi and the storage key
interpretation are disabled. If cmma has already been enabled or the
hpage_2g module parameter is not set to 1, -EINVAL is returned.
8. Other capabilities.
======================