Commit 21be9f71 authored by Will Deacon's avatar Will Deacon
Browse files

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: default avatarMarc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/86a5h5yg5y.wl-maz@kernel.org


Acked-by: default avatarMarc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20240830130150.8568-8-will@kernel.org


Signed-off-by: default avatarWill Deacon <will@kernel.org>
parent 0f126949

include/linux/arm-smccc.h

+60 −0
Original line number Diff line number Diff line
@@ -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