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ANDROID: KVM: arm64: Include MMIO guard and memory relinquish in top-level hypercalls doc

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This introduces a description of the MEM_RELINQUISH hypercall. MMIO
guard hypercalls are already described in another file, which we now
link to.

Signed-off-by: Keir Fraser <keirf@google.com>
Bug: 265943840
Change-Id: Iaffde3419f6432d76598e48c9bab53f672430b7a
This commit is contained in:
Keir Fraser
2023-01-24 11:34:48 +00:00
parent 7eed5740ff
commit 0cd7729ab5
1 changed files with 34 additions and 0 deletions
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34
Documentation/virt/kvm/arm/hypercalls.rst
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@@ -116,3 +116,37 @@ memory protection granule advertised by ``ARM_SMCCC_KVM_FUNC_HYP_MEMINFO``.
| | | +---------------------------------------------+
| | | | ``INVALID_PARAMETER (-3)`` |
+---------------------+----------+----+---------------------------------------------+
``ARM_SMCCC_KVM_FUNC_MEM_RELINQUISH``
--------------------------------------
Cooperatively relinquish ownership of a memory region. The size of the
region is equal to the memory protection granule advertised by
``ARM_SMCCC_KVM_FUNC_HYP_MEMINFO``. If this hypercall is advertised
then it is mandatory to call it before freeing memory via, for
example, virtio balloon. If the caller is a protected VM, it is
guaranteed that the memory region will be completely cleared before
becoming visible to another VM.
+---------------------+-------------------------------------------------------------+
| Presence: | Optional. |
+---------------------+-------------------------------------------------------------+
| Calling convention: | HVC64 |
+---------------------+----------+--------------------------------------------------+
| Function ID: | (uint32) | 0xC6000009 |
+---------------------+----------+----+---------------------------------------------+
| Arguments: | (uint64) | R1 | Base IPA of memory region to relinquish |
| +----------+----+---------------------------------------------+
| | (uint64) | R2 | Reserved / Must be zero |
| +----------+----+---------------------------------------------+
| | (uint64) | R3 | Reserved / Must be zero |
+---------------------+----------+----+---------------------------------------------+
| Return Values: | (int64) | R0 | ``SUCCESS (0)`` |
| | | +---------------------------------------------+
| | | | ``INVALID_PARAMETER (-3)`` |
+---------------------+----------+----+---------------------------------------------+
``ARM_SMCCC_KVM_FUNC_MMIO_GUARD_*``
-----------------------------------
See mmio-guard.rst