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ANDROID: KVM: arm64: Pad IOMMU structs for KMI

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KMI is going to be frozen soon, so add padding in IOMMU structs as
it can be helpful to update the driver without changing the ABI.

The updated structs are:
kvm_iommu_ops: kvm_iommu_driver: reserve 8 qwords, this is only
instantiated once, and the most likely one to change, as it
implements the callbacks between the IOMMU code and the hypervisor module.

kvm_iommu_driver: reserve 8 qwords, this is only instantiated once,
this implements the callbacks between the IOMMU code and the kernel module.

kvm_hyp_iommu: reserve 4 qwords, instantiated once per-iommu.

kvm_hyp_iommu_domain: reserve 2 qwords, this is the most instantiated
struct, so we don’t add a lot of padding.

iommu_iotlb_gather: reserve 2 qwords, in case we need to add hypervisor
specific logic in the future.

io_pgtable_ops: reserve 4 qwords, instantiated once per iommu domain.

Bug: 357781595
Bug: 384432312
Change-Id: I1c5c9e0dd4fe1b422c8a20e23df6b9e10f646071
Signed-off-by: Mostafa Saleh <smostafa@google.com>
This commit is contained in:
Mostafa Saleh
2024-05-09 13:59:07 +00:00
parent d0b6d7deda
commit d4772b152b
5 changed files with 31 additions and 0 deletions
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include/kvm/iommu.h
+6
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@@ -24,6 +24,8 @@ struct kvm_hyp_iommu_domain {
atomic_t refs;
pkvm_handle_t domain_id;
void *priv;
ANDROID_KABI_RESERVE(1);
ANDROID_KABI_RESERVE(2);
};
extern void **kvm_nvhe_sym(kvm_hyp_iommu_domains);
@@ -63,6 +65,10 @@ struct kvm_hyp_iommu {
#endif
struct kvm_power_domain power_domain;
bool power_is_off;
ANDROID_KABI_RESERVE(1);
ANDROID_KABI_RESERVE(2);
ANDROID_KABI_RESERVE(3);
ANDROID_KABI_RESERVE(4);
};
#endif /* __KVM_IOMMU_H */