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RISCV: KVM: Add sstateen0 to ONE_REG

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Add support for sstateen0 CSR to the ONE_REG interface to allow its
access from user space.

Signed-off-by: Mayuresh Chitale <mchitale@ventanamicro.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Mayuresh Chitale 2023-09-13 22:09:05 +05:30 committed by Anup Patel
parent 81f0f314fe
commit c04913f2b5
2 changed files with 70 additions and 2 deletions
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8
arch/riscv/include/uapi/asm/kvm.h
View File

@ -94,6 +94,11 @@ struct kvm_riscv_aia_csr {
unsigned long iprio2h;
};
/* Smstateen CSR for KVM_GET_ONE_REG and KVM_SET_ONE_REG */
struct kvm_riscv_smstateen_csr {
unsigned long sstateen0;
};
/* TIMER registers for KVM_GET_ONE_REG and KVM_SET_ONE_REG */
struct kvm_riscv_timer {
__u64 frequency;
@ -180,10 +185,13 @@ enum KVM_RISCV_SBI_EXT_ID {
#define KVM_REG_RISCV_CSR (0x03 << KVM_REG_RISCV_TYPE_SHIFT)
#define KVM_REG_RISCV_CSR_GENERAL (0x0 << KVM_REG_RISCV_SUBTYPE_SHIFT)
#define KVM_REG_RISCV_CSR_AIA (0x1 << KVM_REG_RISCV_SUBTYPE_SHIFT)
#define KVM_REG_RISCV_CSR_SMSTATEEN (0x2 << KVM_REG_RISCV_SUBTYPE_SHIFT)
#define KVM_REG_RISCV_CSR_REG(name) \
(offsetof(struct kvm_riscv_csr, name) / sizeof(unsigned long))
#define KVM_REG_RISCV_CSR_AIA_REG(name) \
(offsetof(struct kvm_riscv_aia_csr, name) / sizeof(unsigned long))
#define KVM_REG_RISCV_CSR_SMSTATEEN_REG(name) \
(offsetof(struct kvm_riscv_smstateen_csr, name) / sizeof(unsigned long))
/* Timer registers are mapped as type 4 */
#define KVM_REG_RISCV_TIMER (0x04 << KVM_REG_RISCV_TYPE_SHIFT)

64
arch/riscv/kvm/vcpu_onereg.c
View File

@ -382,6 +382,34 @@ static int kvm_riscv_vcpu_general_set_csr(struct kvm_vcpu *vcpu,
return 0;
}
static inline int kvm_riscv_vcpu_smstateen_set_csr(struct kvm_vcpu *vcpu,
unsigned long reg_num,
unsigned long reg_val)
{
struct kvm_vcpu_smstateen_csr *csr = &vcpu->arch.smstateen_csr;
if (reg_num >= sizeof(struct kvm_riscv_smstateen_csr) /
sizeof(unsigned long))
return -EINVAL;
((unsigned long *)csr)[reg_num] = reg_val;
return 0;
}
static int kvm_riscv_vcpu_smstateen_get_csr(struct kvm_vcpu *vcpu,
unsigned long reg_num,
unsigned long *out_val)
{
struct kvm_vcpu_smstateen_csr *csr = &vcpu->arch.smstateen_csr;
if (reg_num >= sizeof(struct kvm_riscv_smstateen_csr) /
sizeof(unsigned long))
return -EINVAL;
*out_val = ((unsigned long *)csr)[reg_num];
return 0;
}
static int kvm_riscv_vcpu_get_reg_csr(struct kvm_vcpu *vcpu,
const struct kvm_one_reg *reg)
{
@ -405,6 +433,12 @@ static int kvm_riscv_vcpu_get_reg_csr(struct kvm_vcpu *vcpu,
case KVM_REG_RISCV_CSR_AIA:
rc = kvm_riscv_vcpu_aia_get_csr(vcpu, reg_num, &reg_val);
break;
case KVM_REG_RISCV_CSR_SMSTATEEN:
rc = -EINVAL;
if (riscv_has_extension_unlikely(RISCV_ISA_EXT_SMSTATEEN))
rc = kvm_riscv_vcpu_smstateen_get_csr(vcpu, reg_num,
&reg_val);
break;
default:
rc = -ENOENT;
break;
@ -444,6 +478,12 @@ static int kvm_riscv_vcpu_set_reg_csr(struct kvm_vcpu *vcpu,
case KVM_REG_RISCV_CSR_AIA:
rc = kvm_riscv_vcpu_aia_set_csr(vcpu, reg_num, reg_val);
break;
case KVM_REG_RISCV_CSR_SMSTATEEN:
rc = -EINVAL;
if (riscv_has_extension_unlikely(RISCV_ISA_EXT_SMSTATEEN))
rc = kvm_riscv_vcpu_smstateen_set_csr(vcpu, reg_num,
reg_val);
break;
default:
rc = -ENOENT;
break;
@ -700,6 +740,8 @@ static inline unsigned long num_csr_regs(const struct kvm_vcpu *vcpu)
if (riscv_isa_extension_available(vcpu->arch.isa, SSAIA))
n += sizeof(struct kvm_riscv_aia_csr) / sizeof(unsigned long);
if (riscv_isa_extension_available(vcpu->arch.isa, SMSTATEEN))
n += sizeof(struct kvm_riscv_smstateen_csr) / sizeof(unsigned long);
return n;
}
@ -708,7 +750,7 @@ static int copy_csr_reg_indices(const struct kvm_vcpu *vcpu,
u64 __user *uindices)
{
int n1 = sizeof(struct kvm_riscv_csr) / sizeof(unsigned long);
int n2 = 0;
int n2 = 0, n3 = 0;
/* copy general csr regs */
for (int i = 0; i < n1; i++) {
@ -742,7 +784,25 @@ static int copy_csr_reg_indices(const struct kvm_vcpu *vcpu,
}
}
return n1 + n2;
/* copy Smstateen csr regs */
if (riscv_isa_extension_available(vcpu->arch.isa, SMSTATEEN)) {
n3 = sizeof(struct kvm_riscv_smstateen_csr) / sizeof(unsigned long);
for (int i = 0; i < n3; i++) {
u64 size = IS_ENABLED(CONFIG_32BIT) ?
KVM_REG_SIZE_U32 : KVM_REG_SIZE_U64;
u64 reg = KVM_REG_RISCV | size | KVM_REG_RISCV_CSR |
KVM_REG_RISCV_CSR_SMSTATEEN | i;
if (uindices) {
if (put_user(reg, uindices))
return -EFAULT;
uindices++;
}
}
}
return n1 + n2 + n3;
}
static inline unsigned long num_timer_regs(void)