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| author | Anup Patel <apatel@ventanamicro.com> | 2023-06-15 10:33:53 +0300 |
|---|---|---|
| committer | Anup Patel <anup@brainfault.org> | 2023-06-19 19:57:58 +0300 |
| commit | 5463091a51cfaab8922ac94e5178a05dfa836dbb (patch) | |
| tree | 0cf99585879526a45fbd266ce9929d0f25422fbb /arch/riscv/include/uapi | |
| parent | db8b7e97d6137a28b2bfc07e591d54da268f0c36 (diff) | |
| download | linux-5463091a51cfaab8922ac94e5178a05dfa836dbb.tar.xz | |
RISC-V: KVM: Expose IMSIC registers as attributes of AIA irqchip
We expose IMSIC registers as KVM device attributes of the in-kernel
AIA irqchip device. This will allow KVM user-space to save/restore
IMISC state of each VCPU using KVM device ioctls().
Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
Signed-off-by: Anup Patel <anup@brainfault.org>
Diffstat (limited to 'arch/riscv/include/uapi')
| -rw-r--r-- | arch/riscv/include/uapi/asm/kvm.h | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/arch/riscv/include/uapi/asm/kvm.h b/arch/riscv/include/uapi/asm/kvm.h index 9ed822fc5589..61d7fecc4899 100644 --- a/arch/riscv/include/uapi/asm/kvm.h +++ b/arch/riscv/include/uapi/asm/kvm.h @@ -255,6 +255,23 @@ enum KVM_RISCV_SBI_EXT_ID { */ #define KVM_DEV_RISCV_AIA_GRP_APLIC 3 +/* + * The lower 12-bits of the device attribute type contains the iselect + * value of the IMSIC register (range 0x70-0xFF) whereas the higher order + * bits contains the VCPU id. + */ +#define KVM_DEV_RISCV_AIA_GRP_IMSIC 4 +#define KVM_DEV_RISCV_AIA_IMSIC_ISEL_BITS 12 +#define KVM_DEV_RISCV_AIA_IMSIC_ISEL_MASK \ + ((1U << KVM_DEV_RISCV_AIA_IMSIC_ISEL_BITS) - 1) +#define KVM_DEV_RISCV_AIA_IMSIC_MKATTR(__vcpu, __isel) \ + (((__vcpu) << KVM_DEV_RISCV_AIA_IMSIC_ISEL_BITS) | \ + ((__isel) & KVM_DEV_RISCV_AIA_IMSIC_ISEL_MASK)) +#define KVM_DEV_RISCV_AIA_IMSIC_GET_ISEL(__attr) \ + ((__attr) & KVM_DEV_RISCV_AIA_IMSIC_ISEL_MASK) +#define KVM_DEV_RISCV_AIA_IMSIC_GET_VCPU(__attr) \ + ((__attr) >> KVM_DEV_RISCV_AIA_IMSIC_ISEL_BITS) + /* One single KVM irqchip, ie. the AIA */ #define KVM_NR_IRQCHIPS 1 |