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RISC-V: KVM: Add SBI MPXY extension support for Guest

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The SBI MPXY extension is a platform-level functionality so KVM only
needs to forward SBI MPXY calls to KVM user-space.

Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Link: https://lore.kernel.org/r/20251017155925.361560-4-apatel@ventanamicro.com
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Anup Patel 2025-10-17 21:29:24 +05:30 • committed by Anup Patel
parent 12fd6c62e9
commit 7050f1d79f
4 changed files with 13 additions and 0 deletions
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1
arch/riscv/include/asm/kvm_vcpu_sbi.h
View file

@ -107,6 +107,7 @@ extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_dbcn;
extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_susp;
extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_sta;
extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_fwft;
extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_mpxy;
extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_experimental;
extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_vendor;

1
arch/riscv/include/uapi/asm/kvm.h
View file

@ -211,6 +211,7 @@ enum KVM_RISCV_SBI_EXT_ID {
KVM_RISCV_SBI_EXT_STA,
KVM_RISCV_SBI_EXT_SUSP,
KVM_RISCV_SBI_EXT_FWFT,
KVM_RISCV_SBI_EXT_MPXY,
KVM_RISCV_SBI_EXT_MAX,
};

4
arch/riscv/kvm/vcpu_sbi.c
View file

@ -82,6 +82,10 @@ static const struct kvm_riscv_sbi_extension_entry sbi_ext[] = {
.ext_idx = KVM_RISCV_SBI_EXT_FWFT,
.ext_ptr = &vcpu_sbi_ext_fwft,
},
{
.ext_idx = KVM_RISCV_SBI_EXT_MPXY,
.ext_ptr = &vcpu_sbi_ext_mpxy,
},
{
.ext_idx = KVM_RISCV_SBI_EXT_EXPERIMENTAL,
.ext_ptr = &vcpu_sbi_ext_experimental,

7
arch/riscv/kvm/vcpu_sbi_forward.c
View file

@ -25,3 +25,10 @@ const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_dbcn = {
.default_disabled = true,
.handler = kvm_riscv_vcpu_sbi_forward_handler,
};
const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_mpxy = {
.extid_start = SBI_EXT_MPXY,
.extid_end = SBI_EXT_MPXY,
.default_disabled = true,
.handler = kvm_riscv_vcpu_sbi_forward_handler,
};