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RISC-V: KVM: Implement ONE_REG interface for SBI FWFT state

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The KVM user-space needs a way to save/restore the state of
SBI FWFT features so implement SBI extension ONE_REG callbacks.

Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Link: https://lore.kernel.org/r/20250823155947.1354229-6-apatel@ventanamicro.com
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Anup Patel
2025-08-23 21:29:46 +05:30
committed by Anup Patel
parent 85e7850e0d
commit 48d67106f4
3 changed files with 200 additions and 13 deletions
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15
arch/riscv/include/uapi/asm/kvm.h
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@@ -220,6 +220,18 @@ struct kvm_riscv_sbi_sta {
unsigned long shmem_hi;
};
struct kvm_riscv_sbi_fwft_feature {
unsigned long enable;
unsigned long flags;
unsigned long value;
};
/* SBI FWFT extension registers for KVM_GET_ONE_REG and KVM_SET_ONE_REG */
struct kvm_riscv_sbi_fwft {
struct kvm_riscv_sbi_fwft_feature misaligned_deleg;
struct kvm_riscv_sbi_fwft_feature pointer_masking;
};
/* Possible states for kvm_riscv_timer */
#define KVM_RISCV_TIMER_STATE_OFF 0
#define KVM_RISCV_TIMER_STATE_ON 1
@@ -303,6 +315,9 @@ struct kvm_riscv_sbi_sta {
#define KVM_REG_RISCV_SBI_STA (0x0 << KVM_REG_RISCV_SUBTYPE_SHIFT)
#define KVM_REG_RISCV_SBI_STA_REG(name) \
(offsetof(struct kvm_riscv_sbi_sta, name) / sizeof(unsigned long))
#define KVM_REG_RISCV_SBI_FWFT (0x1 << KVM_REG_RISCV_SUBTYPE_SHIFT)
#define KVM_REG_RISCV_SBI_FWFT_REG(name) \
(offsetof(struct kvm_riscv_sbi_fwft, name) / sizeof(unsigned long))
/* Device Control API: RISC-V AIA */
#define KVM_DEV_RISCV_APLIC_ALIGN 0x1000