[PATCH] RISC-V: KVM: Improve vector save/restore functions
Andrew Jones
ajones at ventanamicro.com
Fri Aug 4 06:56:18 PDT 2023
Make two nonfunctional changes to the vector get/set vector reg
functions and their supporting function for simplification and
readability. The first is to not pass KVM_REG_RISCV_VECTOR, but
rather integrate it directly into the masking. The second is to
rename reg_val to reg_addr where and address is used instead of
a value.
Also opportunistically touch up some of the code formatting for
a third nonfunctional change.
Signed-off-by: Andrew Jones <ajones at ventanamicro.com>
---
This is based on "[PATCH v4 00/10] RISC-V: KVM: change get_reg/set_reg
error code"[1]
[1] https://lore.kernel.org/all/20230803163302.445167-1-dbarboza@ventanamicro.com/
arch/riscv/include/asm/kvm_vcpu_vector.h | 6 ++--
arch/riscv/kvm/vcpu_onereg.c | 6 ++--
arch/riscv/kvm/vcpu_vector.c | 46 ++++++++++--------------
3 files changed, 23 insertions(+), 35 deletions(-)
diff --git a/arch/riscv/include/asm/kvm_vcpu_vector.h b/arch/riscv/include/asm/kvm_vcpu_vector.h
index ff994fdd6d0d..27f5bccdd8b0 100644
--- a/arch/riscv/include/asm/kvm_vcpu_vector.h
+++ b/arch/riscv/include/asm/kvm_vcpu_vector.h
@@ -74,9 +74,7 @@ static inline void kvm_riscv_vcpu_free_vector_context(struct kvm_vcpu *vcpu)
#endif
int kvm_riscv_vcpu_get_reg_vector(struct kvm_vcpu *vcpu,
- const struct kvm_one_reg *reg,
- unsigned long rtype);
+ const struct kvm_one_reg *reg);
int kvm_riscv_vcpu_set_reg_vector(struct kvm_vcpu *vcpu,
- const struct kvm_one_reg *reg,
- unsigned long rtype);
+ const struct kvm_one_reg *reg);
#endif
diff --git a/arch/riscv/kvm/vcpu_onereg.c b/arch/riscv/kvm/vcpu_onereg.c
index 989ea32dbcbe..9fee1c176fbb 100644
--- a/arch/riscv/kvm/vcpu_onereg.c
+++ b/arch/riscv/kvm/vcpu_onereg.c
@@ -645,8 +645,7 @@ int kvm_riscv_vcpu_set_reg(struct kvm_vcpu *vcpu,
case KVM_REG_RISCV_SBI_EXT:
return kvm_riscv_vcpu_set_reg_sbi_ext(vcpu, reg);
case KVM_REG_RISCV_VECTOR:
- return kvm_riscv_vcpu_set_reg_vector(vcpu, reg,
- KVM_REG_RISCV_VECTOR);
+ return kvm_riscv_vcpu_set_reg_vector(vcpu, reg);
default:
break;
}
@@ -677,8 +676,7 @@ int kvm_riscv_vcpu_get_reg(struct kvm_vcpu *vcpu,
case KVM_REG_RISCV_SBI_EXT:
return kvm_riscv_vcpu_get_reg_sbi_ext(vcpu, reg);
case KVM_REG_RISCV_VECTOR:
- return kvm_riscv_vcpu_get_reg_vector(vcpu, reg,
- KVM_REG_RISCV_VECTOR);
+ return kvm_riscv_vcpu_get_reg_vector(vcpu, reg);
default:
break;
}
diff --git a/arch/riscv/kvm/vcpu_vector.c b/arch/riscv/kvm/vcpu_vector.c
index 39c5bceb4d1b..b430cbb69521 100644
--- a/arch/riscv/kvm/vcpu_vector.c
+++ b/arch/riscv/kvm/vcpu_vector.c
@@ -92,9 +92,9 @@ void kvm_riscv_vcpu_free_vector_context(struct kvm_vcpu *vcpu)
#endif
static int kvm_riscv_vcpu_vreg_addr(struct kvm_vcpu *vcpu,
- unsigned long reg_num,
- size_t reg_size,
- void **reg_val)
+ unsigned long reg_num,
+ size_t reg_size,
+ void **reg_addr)
{
struct kvm_cpu_context *cntx = &vcpu->arch.guest_context;
size_t vlenb = riscv_v_vsize / 32;
@@ -104,16 +104,16 @@ static int kvm_riscv_vcpu_vreg_addr(struct kvm_vcpu *vcpu,
return -EINVAL;
switch (reg_num) {
case KVM_REG_RISCV_VECTOR_CSR_REG(vstart):
- *reg_val = &cntx->vector.vstart;
+ *reg_addr = &cntx->vector.vstart;
break;
case KVM_REG_RISCV_VECTOR_CSR_REG(vl):
- *reg_val = &cntx->vector.vl;
+ *reg_addr = &cntx->vector.vl;
break;
case KVM_REG_RISCV_VECTOR_CSR_REG(vtype):
- *reg_val = &cntx->vector.vtype;
+ *reg_addr = &cntx->vector.vtype;
break;
case KVM_REG_RISCV_VECTOR_CSR_REG(vcsr):
- *reg_val = &cntx->vector.vcsr;
+ *reg_addr = &cntx->vector.vcsr;
break;
case KVM_REG_RISCV_VECTOR_CSR_REG(datap):
default:
@@ -122,8 +122,8 @@ static int kvm_riscv_vcpu_vreg_addr(struct kvm_vcpu *vcpu,
} else if (reg_num <= KVM_REG_RISCV_VECTOR_REG(31)) {
if (reg_size != vlenb)
return -EINVAL;
- *reg_val = cntx->vector.datap
- + (reg_num - KVM_REG_RISCV_VECTOR_REG(0)) * vlenb;
+ *reg_addr = cntx->vector.datap +
+ (reg_num - KVM_REG_RISCV_VECTOR_REG(0)) * vlenb;
} else {
return -ENOENT;
}
@@ -132,60 +132,52 @@ static int kvm_riscv_vcpu_vreg_addr(struct kvm_vcpu *vcpu,
}
int kvm_riscv_vcpu_get_reg_vector(struct kvm_vcpu *vcpu,
- const struct kvm_one_reg *reg,
- unsigned long rtype)
+ const struct kvm_one_reg *reg)
{
unsigned long *isa = vcpu->arch.isa;
unsigned long __user *uaddr =
(unsigned long __user *)(unsigned long)reg->addr;
unsigned long reg_num = reg->id & ~(KVM_REG_ARCH_MASK |
KVM_REG_SIZE_MASK |
- rtype);
+ KVM_REG_RISCV_VECTOR);
size_t reg_size = KVM_REG_SIZE(reg->id);
- void *reg_val;
+ void *reg_addr;
int rc;
- if (rtype != KVM_REG_RISCV_VECTOR)
- return -EINVAL;
-
if (!riscv_isa_extension_available(isa, v))
return -ENOENT;
- rc = kvm_riscv_vcpu_vreg_addr(vcpu, reg_num, reg_size, ®_val);
+ rc = kvm_riscv_vcpu_vreg_addr(vcpu, reg_num, reg_size, ®_addr);
if (rc)
return rc;
- if (copy_to_user(uaddr, reg_val, reg_size))
+ if (copy_to_user(uaddr, reg_addr, reg_size))
return -EFAULT;
return 0;
}
int kvm_riscv_vcpu_set_reg_vector(struct kvm_vcpu *vcpu,
- const struct kvm_one_reg *reg,
- unsigned long rtype)
+ const struct kvm_one_reg *reg)
{
unsigned long *isa = vcpu->arch.isa;
unsigned long __user *uaddr =
(unsigned long __user *)(unsigned long)reg->addr;
unsigned long reg_num = reg->id & ~(KVM_REG_ARCH_MASK |
KVM_REG_SIZE_MASK |
- rtype);
+ KVM_REG_RISCV_VECTOR);
size_t reg_size = KVM_REG_SIZE(reg->id);
- void *reg_val;
+ void *reg_addr;
int rc;
- if (rtype != KVM_REG_RISCV_VECTOR)
- return -EINVAL;
-
if (!riscv_isa_extension_available(isa, v))
return -ENOENT;
- rc = kvm_riscv_vcpu_vreg_addr(vcpu, reg_num, reg_size, ®_val);
+ rc = kvm_riscv_vcpu_vreg_addr(vcpu, reg_num, reg_size, ®_addr);
if (rc)
return rc;
- if (copy_from_user(reg_val, uaddr, reg_size))
+ if (copy_from_user(reg_addr, uaddr, reg_size))
return -EFAULT;
return 0;
--
2.41.0
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