arm64: smccc: Reserve block of KVM "vendor" services for pKVM hypercalls

pKVM relies on hypercalls to expose services such as memory sharing to
protected guests. Tentatively allocate a block of 58 hypercalls (i.e.
fill the remaining space in the first 64 function IDs) for pKVM usage,
as future extensions such as pvIOMMU support, range-based memory sharing
and validation of assigned devices will require additional services.

Suggested-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/86a5h5yg5y.wl-maz@kernel.org
Acked-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20240830130150.8568-8-will@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>

diff --git a/include/linux/arm-smccc.h b/include/linux/arm-smccc.h
index e93c1f7cea7068860696b93886a78dd254051e1e..f59099a213d0d186a82ff1e19f165062d3da325f 100644 (file)
--- a/include/linux/arm-smccc.h
+++ b/include/linux/arm-smccc.h
@@ -115,10 +115,70 @@
 /* KVM "vendor specific" services */
 #define ARM_SMCCC_KVM_FUNC_FEATURES            0
 #define ARM_SMCCC_KVM_FUNC_PTP                 1
+/* Start of pKVM hypercall range */
 #define ARM_SMCCC_KVM_FUNC_HYP_MEMINFO         2
 #define ARM_SMCCC_KVM_FUNC_MEM_SHARE           3
 #define ARM_SMCCC_KVM_FUNC_MEM_UNSHARE         4
+#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_5         5
+#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_6         6
 #define ARM_SMCCC_KVM_FUNC_MMIO_GUARD          7
+#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_8         8
+#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_9         9
+#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_10                10
+#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_11                11
+#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_12                12
+#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_13                13
+#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_14                14
+#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_15                15
+#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_16                16
+#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_17                17
+#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_18                18
+#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_19                19
+#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_20                20
+#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_21                21
+#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_22                22
+#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_23                23
+#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_24                24
+#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_25                25
+#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_26                26
+#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_27                27
+#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_28                28
+#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_29                29
+#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_30                30
+#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_31                31
+#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_32                32
+#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_33                33
+#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_34                34
+#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_35                35
+#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_36                36
+#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_37                37
+#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_38                38
+#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_39                39
+#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_40                40
+#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_41                41
+#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_42                42
+#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_43                43
+#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_44                44
+#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_45                45
+#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_46                46
+#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_47                47
+#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_48                48
+#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_49                49
+#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_50                50
+#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_51                51
+#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_52                52
+#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_53                53
+#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_54                54
+#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_55                55
+#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_56                56
+#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_57                57
+#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_58                58
+#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_59                59
+#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_60                60
+#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_61                61
+#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_62                62
+#define ARM_SMCCC_KVM_FUNC_PKVM_RESV_63                63
+/* End of pKVM hypercall range */
 #define ARM_SMCCC_KVM_FUNC_FEATURES_2          127
 #define ARM_SMCCC_KVM_NUM_FUNCS                        128