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Diffstat (limited to 'arch/riscv/kvm/vcpu.c')
-rw-r--r--arch/riscv/kvm/vcpu.c547
1 files changed, 19 insertions, 528 deletions
diff --git a/arch/riscv/kvm/vcpu.c b/arch/riscv/kvm/vcpu.c
index d12ef99901fc..82229db1ce73 100644
--- a/arch/riscv/kvm/vcpu.c
+++ b/arch/riscv/kvm/vcpu.c
@@ -13,16 +13,12 @@
#include <linux/kdebug.h>
#include <linux/module.h>
#include <linux/percpu.h>
-#include <linux/uaccess.h>
#include <linux/vmalloc.h>
#include <linux/sched/signal.h>
#include <linux/fs.h>
#include <linux/kvm_host.h>
#include <asm/csr.h>
#include <asm/cacheflush.h>
-#include <asm/hwcap.h>
-#include <asm/sbi.h>
-#include <asm/vector.h>
#include <asm/kvm_vcpu_vector.h>
const struct _kvm_stats_desc kvm_vcpu_stats_desc[] = {
@@ -46,79 +42,6 @@ const struct kvm_stats_header kvm_vcpu_stats_header = {
sizeof(kvm_vcpu_stats_desc),
};
-#define KVM_RISCV_BASE_ISA_MASK GENMASK(25, 0)
-
-#define KVM_ISA_EXT_ARR(ext) [KVM_RISCV_ISA_EXT_##ext] = RISCV_ISA_EXT_##ext
-
-/* Mapping between KVM ISA Extension ID & Host ISA extension ID */
-static const unsigned long kvm_isa_ext_arr[] = {
- [KVM_RISCV_ISA_EXT_A] = RISCV_ISA_EXT_a,
- [KVM_RISCV_ISA_EXT_C] = RISCV_ISA_EXT_c,
- [KVM_RISCV_ISA_EXT_D] = RISCV_ISA_EXT_d,
- [KVM_RISCV_ISA_EXT_F] = RISCV_ISA_EXT_f,
- [KVM_RISCV_ISA_EXT_H] = RISCV_ISA_EXT_h,
- [KVM_RISCV_ISA_EXT_I] = RISCV_ISA_EXT_i,
- [KVM_RISCV_ISA_EXT_M] = RISCV_ISA_EXT_m,
- [KVM_RISCV_ISA_EXT_V] = RISCV_ISA_EXT_v,
-
- KVM_ISA_EXT_ARR(SSAIA),
- KVM_ISA_EXT_ARR(SSTC),
- KVM_ISA_EXT_ARR(SVINVAL),
- KVM_ISA_EXT_ARR(SVNAPOT),
- KVM_ISA_EXT_ARR(SVPBMT),
- KVM_ISA_EXT_ARR(ZBB),
- KVM_ISA_EXT_ARR(ZIHINTPAUSE),
- KVM_ISA_EXT_ARR(ZICBOM),
- KVM_ISA_EXT_ARR(ZICBOZ),
-};
-
-static unsigned long kvm_riscv_vcpu_base2isa_ext(unsigned long base_ext)
-{
- unsigned long i;
-
- for (i = 0; i < KVM_RISCV_ISA_EXT_MAX; i++) {
- if (kvm_isa_ext_arr[i] == base_ext)
- return i;
- }
-
- return KVM_RISCV_ISA_EXT_MAX;
-}
-
-static bool kvm_riscv_vcpu_isa_enable_allowed(unsigned long ext)
-{
- switch (ext) {
- case KVM_RISCV_ISA_EXT_H:
- return false;
- case KVM_RISCV_ISA_EXT_V:
- return riscv_v_vstate_ctrl_user_allowed();
- default:
- break;
- }
-
- return true;
-}
-
-static bool kvm_riscv_vcpu_isa_disable_allowed(unsigned long ext)
-{
- switch (ext) {
- case KVM_RISCV_ISA_EXT_A:
- case KVM_RISCV_ISA_EXT_C:
- case KVM_RISCV_ISA_EXT_I:
- case KVM_RISCV_ISA_EXT_M:
- case KVM_RISCV_ISA_EXT_SSAIA:
- case KVM_RISCV_ISA_EXT_SSTC:
- case KVM_RISCV_ISA_EXT_SVINVAL:
- case KVM_RISCV_ISA_EXT_SVNAPOT:
- case KVM_RISCV_ISA_EXT_ZIHINTPAUSE:
- case KVM_RISCV_ISA_EXT_ZBB:
- return false;
- default:
- break;
- }
-
- return true;
-}
-
static void kvm_riscv_reset_vcpu(struct kvm_vcpu *vcpu)
{
struct kvm_vcpu_csr *csr = &vcpu->arch.guest_csr;
@@ -176,7 +99,6 @@ int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
int rc;
struct kvm_cpu_context *cntx;
struct kvm_vcpu_csr *reset_csr = &vcpu->arch.guest_reset_csr;
- unsigned long host_isa, i;
/* Mark this VCPU never ran */
vcpu->arch.ran_atleast_once = false;
@@ -184,12 +106,7 @@ int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
bitmap_zero(vcpu->arch.isa, RISCV_ISA_EXT_MAX);
/* Setup ISA features available to VCPU */
- for (i = 0; i < ARRAY_SIZE(kvm_isa_ext_arr); i++) {
- host_isa = kvm_isa_ext_arr[i];
- if (__riscv_isa_extension_available(NULL, host_isa) &&
- kvm_riscv_vcpu_isa_enable_allowed(i))
- set_bit(host_isa, vcpu->arch.isa);
- }
+ kvm_riscv_vcpu_setup_isa(vcpu);
/* Setup vendor, arch, and implementation details */
vcpu->arch.mvendorid = sbi_get_mvendorid();
@@ -294,450 +211,6 @@ vm_fault_t kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
return VM_FAULT_SIGBUS;
}
-static int kvm_riscv_vcpu_get_reg_config(struct kvm_vcpu *vcpu,
- const struct kvm_one_reg *reg)
-{
- 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 |
- KVM_REG_RISCV_CONFIG);
- unsigned long reg_val;
-
- if (KVM_REG_SIZE(reg->id) != sizeof(unsigned long))
- return -EINVAL;
-
- switch (reg_num) {
- case KVM_REG_RISCV_CONFIG_REG(isa):
- reg_val = vcpu->arch.isa[0] & KVM_RISCV_BASE_ISA_MASK;
- break;
- case KVM_REG_RISCV_CONFIG_REG(zicbom_block_size):
- if (!riscv_isa_extension_available(vcpu->arch.isa, ZICBOM))
- return -EINVAL;
- reg_val = riscv_cbom_block_size;
- break;
- case KVM_REG_RISCV_CONFIG_REG(zicboz_block_size):
- if (!riscv_isa_extension_available(vcpu->arch.isa, ZICBOZ))
- return -EINVAL;
- reg_val = riscv_cboz_block_size;
- break;
- case KVM_REG_RISCV_CONFIG_REG(mvendorid):
- reg_val = vcpu->arch.mvendorid;
- break;
- case KVM_REG_RISCV_CONFIG_REG(marchid):
- reg_val = vcpu->arch.marchid;
- break;
- case KVM_REG_RISCV_CONFIG_REG(mimpid):
- reg_val = vcpu->arch.mimpid;
- break;
- default:
- return -EINVAL;
- }
-
- if (copy_to_user(uaddr, &reg_val, KVM_REG_SIZE(reg->id)))
- return -EFAULT;
-
- return 0;
-}
-
-static int kvm_riscv_vcpu_set_reg_config(struct kvm_vcpu *vcpu,
- const struct kvm_one_reg *reg)
-{
- 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 |
- KVM_REG_RISCV_CONFIG);
- unsigned long i, isa_ext, reg_val;
-
- if (KVM_REG_SIZE(reg->id) != sizeof(unsigned long))
- return -EINVAL;
-
- if (copy_from_user(&reg_val, uaddr, KVM_REG_SIZE(reg->id)))
- return -EFAULT;
-
- switch (reg_num) {
- case KVM_REG_RISCV_CONFIG_REG(isa):
- /*
- * This ONE REG interface is only defined for
- * single letter extensions.
- */
- if (fls(reg_val) >= RISCV_ISA_EXT_BASE)
- return -EINVAL;
-
- if (!vcpu->arch.ran_atleast_once) {
- /* Ignore the enable/disable request for certain extensions */
- for (i = 0; i < RISCV_ISA_EXT_BASE; i++) {
- isa_ext = kvm_riscv_vcpu_base2isa_ext(i);
- if (isa_ext >= KVM_RISCV_ISA_EXT_MAX) {
- reg_val &= ~BIT(i);
- continue;
- }
- if (!kvm_riscv_vcpu_isa_enable_allowed(isa_ext))
- if (reg_val & BIT(i))
- reg_val &= ~BIT(i);
- if (!kvm_riscv_vcpu_isa_disable_allowed(isa_ext))
- if (!(reg_val & BIT(i)))
- reg_val |= BIT(i);
- }
- reg_val &= riscv_isa_extension_base(NULL);
- /* Do not modify anything beyond single letter extensions */
- reg_val = (vcpu->arch.isa[0] & ~KVM_RISCV_BASE_ISA_MASK) |
- (reg_val & KVM_RISCV_BASE_ISA_MASK);
- vcpu->arch.isa[0] = reg_val;
- kvm_riscv_vcpu_fp_reset(vcpu);
- } else {
- return -EOPNOTSUPP;
- }
- break;
- case KVM_REG_RISCV_CONFIG_REG(zicbom_block_size):
- return -EOPNOTSUPP;
- case KVM_REG_RISCV_CONFIG_REG(zicboz_block_size):
- return -EOPNOTSUPP;
- case KVM_REG_RISCV_CONFIG_REG(mvendorid):
- if (!vcpu->arch.ran_atleast_once)
- vcpu->arch.mvendorid = reg_val;
- else
- return -EBUSY;
- break;
- case KVM_REG_RISCV_CONFIG_REG(marchid):
- if (!vcpu->arch.ran_atleast_once)
- vcpu->arch.marchid = reg_val;
- else
- return -EBUSY;
- break;
- case KVM_REG_RISCV_CONFIG_REG(mimpid):
- if (!vcpu->arch.ran_atleast_once)
- vcpu->arch.mimpid = reg_val;
- else
- return -EBUSY;
- break;
- default:
- return -EINVAL;
- }
-
- return 0;
-}
-
-static int kvm_riscv_vcpu_get_reg_core(struct kvm_vcpu *vcpu,
- const struct kvm_one_reg *reg)
-{
- struct kvm_cpu_context *cntx = &vcpu->arch.guest_context;
- 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 |
- KVM_REG_RISCV_CORE);
- unsigned long reg_val;
-
- if (KVM_REG_SIZE(reg->id) != sizeof(unsigned long))
- return -EINVAL;
- if (reg_num >= sizeof(struct kvm_riscv_core) / sizeof(unsigned long))
- return -EINVAL;
-
- if (reg_num == KVM_REG_RISCV_CORE_REG(regs.pc))
- reg_val = cntx->sepc;
- else if (KVM_REG_RISCV_CORE_REG(regs.pc) < reg_num &&
- reg_num <= KVM_REG_RISCV_CORE_REG(regs.t6))
- reg_val = ((unsigned long *)cntx)[reg_num];
- else if (reg_num == KVM_REG_RISCV_CORE_REG(mode))
- reg_val = (cntx->sstatus & SR_SPP) ?
- KVM_RISCV_MODE_S : KVM_RISCV_MODE_U;
- else
- return -EINVAL;
-
- if (copy_to_user(uaddr, &reg_val, KVM_REG_SIZE(reg->id)))
- return -EFAULT;
-
- return 0;
-}
-
-static int kvm_riscv_vcpu_set_reg_core(struct kvm_vcpu *vcpu,
- const struct kvm_one_reg *reg)
-{
- struct kvm_cpu_context *cntx = &vcpu->arch.guest_context;
- 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 |
- KVM_REG_RISCV_CORE);
- unsigned long reg_val;
-
- if (KVM_REG_SIZE(reg->id) != sizeof(unsigned long))
- return -EINVAL;
- if (reg_num >= sizeof(struct kvm_riscv_core) / sizeof(unsigned long))
- return -EINVAL;
-
- if (copy_from_user(&reg_val, uaddr, KVM_REG_SIZE(reg->id)))
- return -EFAULT;
-
- if (reg_num == KVM_REG_RISCV_CORE_REG(regs.pc))
- cntx->sepc = reg_val;
- else if (KVM_REG_RISCV_CORE_REG(regs.pc) < reg_num &&
- reg_num <= KVM_REG_RISCV_CORE_REG(regs.t6))
- ((unsigned long *)cntx)[reg_num] = reg_val;
- else if (reg_num == KVM_REG_RISCV_CORE_REG(mode)) {
- if (reg_val == KVM_RISCV_MODE_S)
- cntx->sstatus |= SR_SPP;
- else
- cntx->sstatus &= ~SR_SPP;
- } else
- return -EINVAL;
-
- return 0;
-}
-
-static int kvm_riscv_vcpu_general_get_csr(struct kvm_vcpu *vcpu,
- unsigned long reg_num,
- unsigned long *out_val)
-{
- struct kvm_vcpu_csr *csr = &vcpu->arch.guest_csr;
-
- if (reg_num >= sizeof(struct kvm_riscv_csr) / sizeof(unsigned long))
- return -EINVAL;
-
- if (reg_num == KVM_REG_RISCV_CSR_REG(sip)) {
- kvm_riscv_vcpu_flush_interrupts(vcpu);
- *out_val = (csr->hvip >> VSIP_TO_HVIP_SHIFT) & VSIP_VALID_MASK;
- *out_val |= csr->hvip & ~IRQ_LOCAL_MASK;
- } else
- *out_val = ((unsigned long *)csr)[reg_num];
-
- return 0;
-}
-
-static inline int kvm_riscv_vcpu_general_set_csr(struct kvm_vcpu *vcpu,
- unsigned long reg_num,
- unsigned long reg_val)
-{
- struct kvm_vcpu_csr *csr = &vcpu->arch.guest_csr;
-
- if (reg_num >= sizeof(struct kvm_riscv_csr) / sizeof(unsigned long))
- return -EINVAL;
-
- if (reg_num == KVM_REG_RISCV_CSR_REG(sip)) {
- reg_val &= VSIP_VALID_MASK;
- reg_val <<= VSIP_TO_HVIP_SHIFT;
- }
-
- ((unsigned long *)csr)[reg_num] = reg_val;
-
- if (reg_num == KVM_REG_RISCV_CSR_REG(sip))
- WRITE_ONCE(vcpu->arch.irqs_pending_mask[0], 0);
-
- return 0;
-}
-
-static int kvm_riscv_vcpu_get_reg_csr(struct kvm_vcpu *vcpu,
- const struct kvm_one_reg *reg)
-{
- int rc;
- 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 |
- KVM_REG_RISCV_CSR);
- unsigned long reg_val, reg_subtype;
-
- if (KVM_REG_SIZE(reg->id) != sizeof(unsigned long))
- return -EINVAL;
-
- reg_subtype = reg_num & KVM_REG_RISCV_SUBTYPE_MASK;
- reg_num &= ~KVM_REG_RISCV_SUBTYPE_MASK;
- switch (reg_subtype) {
- case KVM_REG_RISCV_CSR_GENERAL:
- rc = kvm_riscv_vcpu_general_get_csr(vcpu, reg_num, &reg_val);
- break;
- case KVM_REG_RISCV_CSR_AIA:
- rc = kvm_riscv_vcpu_aia_get_csr(vcpu, reg_num, &reg_val);
- break;
- default:
- rc = -EINVAL;
- break;
- }
- if (rc)
- return rc;
-
- if (copy_to_user(uaddr, &reg_val, KVM_REG_SIZE(reg->id)))
- return -EFAULT;
-
- return 0;
-}
-
-static int kvm_riscv_vcpu_set_reg_csr(struct kvm_vcpu *vcpu,
- const struct kvm_one_reg *reg)
-{
- int rc;
- 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 |
- KVM_REG_RISCV_CSR);
- unsigned long reg_val, reg_subtype;
-
- if (KVM_REG_SIZE(reg->id) != sizeof(unsigned long))
- return -EINVAL;
-
- if (copy_from_user(&reg_val, uaddr, KVM_REG_SIZE(reg->id)))
- return -EFAULT;
-
- reg_subtype = reg_num & KVM_REG_RISCV_SUBTYPE_MASK;
- reg_num &= ~KVM_REG_RISCV_SUBTYPE_MASK;
- switch (reg_subtype) {
- case KVM_REG_RISCV_CSR_GENERAL:
- rc = kvm_riscv_vcpu_general_set_csr(vcpu, reg_num, reg_val);
- break;
- case KVM_REG_RISCV_CSR_AIA:
- rc = kvm_riscv_vcpu_aia_set_csr(vcpu, reg_num, reg_val);
- break;
- default:
- rc = -EINVAL;
- break;
- }
- if (rc)
- return rc;
-
- return 0;
-}
-
-static int kvm_riscv_vcpu_get_reg_isa_ext(struct kvm_vcpu *vcpu,
- const struct kvm_one_reg *reg)
-{
- 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 |
- KVM_REG_RISCV_ISA_EXT);
- unsigned long reg_val = 0;
- unsigned long host_isa_ext;
-
- if (KVM_REG_SIZE(reg->id) != sizeof(unsigned long))
- return -EINVAL;
-
- if (reg_num >= KVM_RISCV_ISA_EXT_MAX ||
- reg_num >= ARRAY_SIZE(kvm_isa_ext_arr))
- return -EINVAL;
-
- host_isa_ext = kvm_isa_ext_arr[reg_num];
- if (__riscv_isa_extension_available(vcpu->arch.isa, host_isa_ext))
- reg_val = 1; /* Mark the given extension as available */
-
- if (copy_to_user(uaddr, &reg_val, KVM_REG_SIZE(reg->id)))
- return -EFAULT;
-
- return 0;
-}
-
-static int kvm_riscv_vcpu_set_reg_isa_ext(struct kvm_vcpu *vcpu,
- const struct kvm_one_reg *reg)
-{
- 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 |
- KVM_REG_RISCV_ISA_EXT);
- unsigned long reg_val;
- unsigned long host_isa_ext;
-
- if (KVM_REG_SIZE(reg->id) != sizeof(unsigned long))
- return -EINVAL;
-
- if (reg_num >= KVM_RISCV_ISA_EXT_MAX ||
- reg_num >= ARRAY_SIZE(kvm_isa_ext_arr))
- return -EINVAL;
-
- if (copy_from_user(&reg_val, uaddr, KVM_REG_SIZE(reg->id)))
- return -EFAULT;
-
- host_isa_ext = kvm_isa_ext_arr[reg_num];
- if (!__riscv_isa_extension_available(NULL, host_isa_ext))
- return -EOPNOTSUPP;
-
- if (!vcpu->arch.ran_atleast_once) {
- /*
- * All multi-letter extension and a few single letter
- * extension can be disabled
- */
- if (reg_val == 1 &&
- kvm_riscv_vcpu_isa_enable_allowed(reg_num))
- set_bit(host_isa_ext, vcpu->arch.isa);
- else if (!reg_val &&
- kvm_riscv_vcpu_isa_disable_allowed(reg_num))
- clear_bit(host_isa_ext, vcpu->arch.isa);
- else
- return -EINVAL;
- kvm_riscv_vcpu_fp_reset(vcpu);
- } else {
- return -EOPNOTSUPP;
- }
-
- return 0;
-}
-
-static int kvm_riscv_vcpu_set_reg(struct kvm_vcpu *vcpu,
- const struct kvm_one_reg *reg)
-{
- switch (reg->id & KVM_REG_RISCV_TYPE_MASK) {
- case KVM_REG_RISCV_CONFIG:
- return kvm_riscv_vcpu_set_reg_config(vcpu, reg);
- case KVM_REG_RISCV_CORE:
- return kvm_riscv_vcpu_set_reg_core(vcpu, reg);
- case KVM_REG_RISCV_CSR:
- return kvm_riscv_vcpu_set_reg_csr(vcpu, reg);
- case KVM_REG_RISCV_TIMER:
- return kvm_riscv_vcpu_set_reg_timer(vcpu, reg);
- case KVM_REG_RISCV_FP_F:
- return kvm_riscv_vcpu_set_reg_fp(vcpu, reg,
- KVM_REG_RISCV_FP_F);
- case KVM_REG_RISCV_FP_D:
- return kvm_riscv_vcpu_set_reg_fp(vcpu, reg,
- KVM_REG_RISCV_FP_D);
- case KVM_REG_RISCV_ISA_EXT:
- return kvm_riscv_vcpu_set_reg_isa_ext(vcpu, reg);
- 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);
- default:
- break;
- }
-
- return -EINVAL;
-}
-
-static int kvm_riscv_vcpu_get_reg(struct kvm_vcpu *vcpu,
- const struct kvm_one_reg *reg)
-{
- switch (reg->id & KVM_REG_RISCV_TYPE_MASK) {
- case KVM_REG_RISCV_CONFIG:
- return kvm_riscv_vcpu_get_reg_config(vcpu, reg);
- case KVM_REG_RISCV_CORE:
- return kvm_riscv_vcpu_get_reg_core(vcpu, reg);
- case KVM_REG_RISCV_CSR:
- return kvm_riscv_vcpu_get_reg_csr(vcpu, reg);
- case KVM_REG_RISCV_TIMER:
- return kvm_riscv_vcpu_get_reg_timer(vcpu, reg);
- case KVM_REG_RISCV_FP_F:
- return kvm_riscv_vcpu_get_reg_fp(vcpu, reg,
- KVM_REG_RISCV_FP_F);
- case KVM_REG_RISCV_FP_D:
- return kvm_riscv_vcpu_get_reg_fp(vcpu, reg,
- KVM_REG_RISCV_FP_D);
- case KVM_REG_RISCV_ISA_EXT:
- return kvm_riscv_vcpu_get_reg_isa_ext(vcpu, reg);
- 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);
- default:
- break;
- }
-
- return -EINVAL;
-}
-
long kvm_arch_vcpu_async_ioctl(struct file *filp,
unsigned int ioctl, unsigned long arg)
{
@@ -781,6 +254,24 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
r = kvm_riscv_vcpu_get_reg(vcpu, &reg);
break;
}
+ case KVM_GET_REG_LIST: {
+ struct kvm_reg_list __user *user_list = argp;
+ struct kvm_reg_list reg_list;
+ unsigned int n;
+
+ r = -EFAULT;
+ if (copy_from_user(&reg_list, user_list, sizeof(reg_list)))
+ break;
+ n = reg_list.n;
+ reg_list.n = kvm_riscv_vcpu_num_regs(vcpu);
+ if (copy_to_user(user_list, &reg_list, sizeof(reg_list)))
+ break;
+ r = -E2BIG;
+ if (n < reg_list.n)
+ break;
+ r = kvm_riscv_vcpu_copy_reg_indices(vcpu, user_list->reg);
+ break;
+ }
default:
break;
}