[PATCH v1 04/24] LoongArch: KVM: Implement vcpu get, vcpu set registers

[Tianrui Zhao <zhaotianrui@xxxxxxxxxxx>]

Implement loongarch vcpu get registers and set registers operations, it
is called when user space use the ioctl interface to get or set regs.

Signed-off-by: Tianrui Zhao <zhaotianrui@xxxxxxxxxxx>
---
 arch/loongarch/kvm/vcpu.c | 442 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 442 insertions(+)

diff --git a/arch/loongarch/kvm/vcpu.c b/arch/loongarch/kvm/vcpu.c
index 1732da8a8..a18864284 100644
--- a/arch/loongarch/kvm/vcpu.c
+++ b/arch/loongarch/kvm/vcpu.c
@@ -13,6 +13,448 @@
 #define CREATE_TRACE_POINTS
 #include "trace.h"
 
+int _kvm_getcsr(struct kvm_vcpu *vcpu, unsigned int id, u64 *v, int force)
+{
+	struct loongarch_csrs *csr = vcpu->arch.csr;
+
+	GET_HW_GCSR(id, LOONGARCH_CSR_CRMD, v);
+	GET_HW_GCSR(id, LOONGARCH_CSR_PRMD, v);
+	GET_HW_GCSR(id, LOONGARCH_CSR_EUEN, v);
+	GET_HW_GCSR(id, LOONGARCH_CSR_MISC, v);
+	GET_HW_GCSR(id, LOONGARCH_CSR_ECFG, v);
+	GET_HW_GCSR(id, LOONGARCH_CSR_ESTAT, v);
+	GET_HW_GCSR(id, LOONGARCH_CSR_ERA, v);
+	GET_HW_GCSR(id, LOONGARCH_CSR_BADV, v);
+	GET_HW_GCSR(id, LOONGARCH_CSR_BADI, v);
+	GET_HW_GCSR(id, LOONGARCH_CSR_EENTRY, v);
+	GET_HW_GCSR(id, LOONGARCH_CSR_TLBIDX, v);
+	GET_HW_GCSR(id, LOONGARCH_CSR_TLBEHI, v);
+	GET_HW_GCSR(id, LOONGARCH_CSR_TLBELO0, v);
+	GET_HW_GCSR(id, LOONGARCH_CSR_TLBELO1, v);
+	GET_HW_GCSR(id, LOONGARCH_CSR_ASID, v);
+	GET_HW_GCSR(id, LOONGARCH_CSR_PGDL, v);
+	GET_HW_GCSR(id, LOONGARCH_CSR_PGDH, v);
+	GET_HW_GCSR(id, LOONGARCH_CSR_PWCTL0, v);
+	GET_HW_GCSR(id, LOONGARCH_CSR_PWCTL1, v);
+	GET_HW_GCSR(id, LOONGARCH_CSR_STLBPGSIZE, v);
+	GET_HW_GCSR(id, LOONGARCH_CSR_RVACFG, v);
+	GET_HW_GCSR(id, LOONGARCH_CSR_CPUID, v);
+	GET_HW_GCSR(id, LOONGARCH_CSR_PRCFG1, v);
+	GET_HW_GCSR(id, LOONGARCH_CSR_PRCFG2, v);
+	GET_HW_GCSR(id, LOONGARCH_CSR_PRCFG3, v);
+	GET_HW_GCSR(id, LOONGARCH_CSR_KS0, v);
+	GET_HW_GCSR(id, LOONGARCH_CSR_KS1, v);
+	GET_HW_GCSR(id, LOONGARCH_CSR_KS2, v);
+	GET_HW_GCSR(id, LOONGARCH_CSR_KS3, v);
+	GET_HW_GCSR(id, LOONGARCH_CSR_KS4, v);
+	GET_HW_GCSR(id, LOONGARCH_CSR_KS5, v);
+	GET_HW_GCSR(id, LOONGARCH_CSR_KS6, v);
+	GET_HW_GCSR(id, LOONGARCH_CSR_KS7, v);
+	GET_HW_GCSR(id, LOONGARCH_CSR_TMID, v);
+	GET_HW_GCSR(id, LOONGARCH_CSR_TCFG, v);
+	GET_HW_GCSR(id, LOONGARCH_CSR_TVAL, v);
+	GET_HW_GCSR(id, LOONGARCH_CSR_CNTC, v);
+	GET_HW_GCSR(id, LOONGARCH_CSR_LLBCTL, v);
+	GET_HW_GCSR(id, LOONGARCH_CSR_TLBRENTRY, v);
+	GET_HW_GCSR(id, LOONGARCH_CSR_TLBRBADV, v);
+	GET_HW_GCSR(id, LOONGARCH_CSR_TLBRERA, v);
+	GET_HW_GCSR(id, LOONGARCH_CSR_TLBRSAVE, v);
+	GET_HW_GCSR(id, LOONGARCH_CSR_TLBRELO0, v);
+	GET_HW_GCSR(id, LOONGARCH_CSR_TLBRELO1, v);
+	GET_HW_GCSR(id, LOONGARCH_CSR_TLBREHI, v);
+	GET_HW_GCSR(id, LOONGARCH_CSR_TLBRPRMD, v);
+	GET_HW_GCSR(id, LOONGARCH_CSR_DMWIN0, v);
+	GET_HW_GCSR(id, LOONGARCH_CSR_DMWIN1, v);
+	GET_HW_GCSR(id, LOONGARCH_CSR_DMWIN2, v);
+	GET_HW_GCSR(id, LOONGARCH_CSR_DMWIN3, v);
+	GET_HW_GCSR(id, LOONGARCH_CSR_MWPS, v);
+	GET_HW_GCSR(id, LOONGARCH_CSR_FWPS, v);
+
+	GET_SW_GCSR(csr, id, LOONGARCH_CSR_IMPCTL1, v);
+	GET_SW_GCSR(csr, id, LOONGARCH_CSR_IMPCTL2, v);
+	GET_SW_GCSR(csr, id, LOONGARCH_CSR_MERRCTL, v);
+	GET_SW_GCSR(csr, id, LOONGARCH_CSR_MERRINFO1, v);
+	GET_SW_GCSR(csr, id, LOONGARCH_CSR_MERRINFO2, v);
+	GET_SW_GCSR(csr, id, LOONGARCH_CSR_MERRENTRY, v);
+	GET_SW_GCSR(csr, id, LOONGARCH_CSR_MERRERA, v);
+	GET_SW_GCSR(csr, id, LOONGARCH_CSR_MERRSAVE, v);
+	GET_SW_GCSR(csr, id, LOONGARCH_CSR_CTAG, v);
+	GET_SW_GCSR(csr, id, LOONGARCH_CSR_DEBUG, v);
+	GET_SW_GCSR(csr, id, LOONGARCH_CSR_DERA, v);
+	GET_SW_GCSR(csr, id, LOONGARCH_CSR_DESAVE, v);
+
+	GET_SW_GCSR(csr, id, LOONGARCH_CSR_TINTCLR, v);
+
+	if (force && (id < CSR_ALL_SIZE)) {
+		*v = kvm_read_sw_gcsr(csr, id);
+		return 0;
+	}
+
+	return -1;
+}
+
+int _kvm_setcsr(struct kvm_vcpu *vcpu, unsigned int id, u64 *v, int force)
+{
+	struct loongarch_csrs *csr = vcpu->arch.csr;
+	int ret;
+
+	SET_HW_GCSR(csr, id, LOONGARCH_CSR_CRMD, v);
+	SET_HW_GCSR(csr, id, LOONGARCH_CSR_PRMD, v);
+	SET_HW_GCSR(csr, id, LOONGARCH_CSR_EUEN, v);
+	SET_HW_GCSR(csr, id, LOONGARCH_CSR_MISC, v);
+	SET_HW_GCSR(csr, id, LOONGARCH_CSR_ECFG, v);
+	SET_HW_GCSR(csr, id, LOONGARCH_CSR_ERA, v);
+	SET_HW_GCSR(csr, id, LOONGARCH_CSR_BADV, v);
+	SET_HW_GCSR(csr, id, LOONGARCH_CSR_BADI, v);
+	SET_HW_GCSR(csr, id, LOONGARCH_CSR_EENTRY, v);
+	SET_HW_GCSR(csr, id, LOONGARCH_CSR_TLBIDX, v);
+	SET_HW_GCSR(csr, id, LOONGARCH_CSR_TLBEHI, v);
+	SET_HW_GCSR(csr, id, LOONGARCH_CSR_TLBELO0, v);
+	SET_HW_GCSR(csr, id, LOONGARCH_CSR_TLBELO1, v);
+	SET_HW_GCSR(csr, id, LOONGARCH_CSR_ASID, v);
+	SET_HW_GCSR(csr, id, LOONGARCH_CSR_PGDL, v);
+	SET_HW_GCSR(csr, id, LOONGARCH_CSR_PGDH, v);
+	SET_HW_GCSR(csr, id, LOONGARCH_CSR_PWCTL0, v);
+	SET_HW_GCSR(csr, id, LOONGARCH_CSR_PWCTL1, v);
+	SET_HW_GCSR(csr, id, LOONGARCH_CSR_STLBPGSIZE, v);
+	SET_HW_GCSR(csr, id, LOONGARCH_CSR_RVACFG, v);
+	SET_HW_GCSR(csr, id, LOONGARCH_CSR_CPUID, v);
+	SET_HW_GCSR(csr, id, LOONGARCH_CSR_KS0, v);
+	SET_HW_GCSR(csr, id, LOONGARCH_CSR_KS1, v);
+	SET_HW_GCSR(csr, id, LOONGARCH_CSR_KS2, v);
+	SET_HW_GCSR(csr, id, LOONGARCH_CSR_KS3, v);
+	SET_HW_GCSR(csr, id, LOONGARCH_CSR_KS4, v);
+	SET_HW_GCSR(csr, id, LOONGARCH_CSR_KS5, v);
+	SET_HW_GCSR(csr, id, LOONGARCH_CSR_KS6, v);
+	SET_HW_GCSR(csr, id, LOONGARCH_CSR_KS7, v);
+	SET_HW_GCSR(csr, id, LOONGARCH_CSR_TMID, v);
+	SET_HW_GCSR(csr, id, LOONGARCH_CSR_TCFG, v);
+	SET_HW_GCSR(csr, id, LOONGARCH_CSR_TVAL, v);
+	SET_HW_GCSR(csr, id, LOONGARCH_CSR_CNTC, v);
+	SET_HW_GCSR(csr, id, LOONGARCH_CSR_LLBCTL, v);
+	SET_HW_GCSR(csr, id, LOONGARCH_CSR_TLBRENTRY, v);
+	SET_HW_GCSR(csr, id, LOONGARCH_CSR_TLBRBADV, v);
+	SET_HW_GCSR(csr, id, LOONGARCH_CSR_TLBRERA, v);
+	SET_HW_GCSR(csr, id, LOONGARCH_CSR_TLBRSAVE, v);
+	SET_HW_GCSR(csr, id, LOONGARCH_CSR_TLBRELO0, v);
+	SET_HW_GCSR(csr, id, LOONGARCH_CSR_TLBRELO1, v);
+	SET_HW_GCSR(csr, id, LOONGARCH_CSR_TLBREHI, v);
+	SET_HW_GCSR(csr, id, LOONGARCH_CSR_TLBRPRMD, v);
+	SET_HW_GCSR(csr, id, LOONGARCH_CSR_DMWIN0, v);
+	SET_HW_GCSR(csr, id, LOONGARCH_CSR_DMWIN1, v);
+	SET_HW_GCSR(csr, id, LOONGARCH_CSR_DMWIN2, v);
+	SET_HW_GCSR(csr, id, LOONGARCH_CSR_DMWIN3, v);
+	SET_HW_GCSR(csr, id, LOONGARCH_CSR_MWPS, v);
+	SET_HW_GCSR(csr, id, LOONGARCH_CSR_FWPS, v);
+
+	SET_SW_GCSR(csr, id, LOONGARCH_CSR_IMPCTL1, v);
+	SET_SW_GCSR(csr, id, LOONGARCH_CSR_IMPCTL2, v);
+	SET_SW_GCSR(csr, id, LOONGARCH_CSR_MERRCTL, v);
+	SET_SW_GCSR(csr, id, LOONGARCH_CSR_MERRINFO1, v);
+	SET_SW_GCSR(csr, id, LOONGARCH_CSR_MERRINFO2, v);
+	SET_SW_GCSR(csr, id, LOONGARCH_CSR_MERRENTRY, v);
+	SET_SW_GCSR(csr, id, LOONGARCH_CSR_MERRERA, v);
+	SET_SW_GCSR(csr, id, LOONGARCH_CSR_MERRSAVE, v);
+	SET_SW_GCSR(csr, id, LOONGARCH_CSR_CTAG, v);
+	SET_SW_GCSR(csr, id, LOONGARCH_CSR_DEBUG, v);
+	SET_SW_GCSR(csr, id, LOONGARCH_CSR_DERA, v);
+	SET_SW_GCSR(csr, id, LOONGARCH_CSR_DESAVE, v);
+	SET_SW_GCSR(csr, id, LOONGARCH_CSR_PRCFG1, v);
+	SET_SW_GCSR(csr, id, LOONGARCH_CSR_PRCFG2, v);
+	SET_SW_GCSR(csr, id, LOONGARCH_CSR_PRCFG3, v);
+
+	SET_SW_GCSR(csr, id, LOONGARCH_CSR_PGD, v);
+	SET_SW_GCSR(csr, id, LOONGARCH_CSR_TINTCLR, v);
+
+	ret = -1;
+	switch (id) {
+	case LOONGARCH_CSR_ESTAT:
+		write_gcsr_estat(*v);
+		/* estat IP0~IP7 inject through guestexcept */
+		write_csr_gintc(((*v) >> 2)  & 0xff);
+		ret = 0;
+		break;
+	default:
+		if (force && (id < CSR_ALL_SIZE)) {
+			kvm_set_sw_gcsr(csr, id, *v);
+			ret = 0;
+		}
+		break;
+	}
+
+	return ret;
+}
+
+static int _kvm_get_one_reg(struct kvm_vcpu *vcpu,
+		const struct kvm_one_reg *reg, s64 *v)
+{
+	struct loongarch_csrs *csr = vcpu->arch.csr;
+	int reg_idx, ret;
+
+	if ((reg->id & KVM_IOC_CSRID(0)) == KVM_IOC_CSRID(0)) {
+		reg_idx = KVM_GET_IOC_CSRIDX(reg->id);
+		ret = _kvm_getcsr(vcpu, reg_idx, v, 0);
+		if (ret == 0)
+			return ret;
+	}
+
+	switch (reg->id) {
+	case KVM_REG_LOONGARCH_COUNTER:
+		*v = drdtime() + vcpu->kvm->arch.time_offset;
+		break;
+	default:
+		if ((reg->id & KVM_REG_LOONGARCH_MASK) != KVM_REG_LOONGARCH_CSR)
+			return -EINVAL;
+
+		reg_idx = KVM_GET_IOC_CSRIDX(reg->id);
+		if (reg_idx < CSR_ALL_SIZE)
+			*v = kvm_read_sw_gcsr(csr, reg_idx);
+		else
+			return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int _kvm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
+{
+	int ret;
+	s64 v;
+
+	ret = _kvm_get_one_reg(vcpu, reg, &v);
+	if (ret)
+		return ret;
+
+	ret = -EINVAL;
+	if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U64) {
+		u64 __user *uaddr = (u64 __user *)(long)reg->addr;
+
+		ret = put_user(v, uaddr);
+	} else if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U32) {
+		u32 __user *uaddr = (u32 __user *)(long)reg->addr;
+		u32 v32 = (u32)v;
+
+		ret = put_user(v32, uaddr);
+	}
+
+	return ret;
+}
+
+static int _kvm_set_one_reg(struct kvm_vcpu *vcpu,
+		const struct kvm_one_reg *reg,
+		s64 v)
+{
+	struct loongarch_csrs *csr = vcpu->arch.csr;
+	int ret = 0;
+	unsigned long flags;
+	u64 val;
+	int reg_idx;
+
+	val = v;
+	if ((reg->id & KVM_IOC_CSRID(0)) == KVM_IOC_CSRID(0)) {
+		reg_idx = KVM_GET_IOC_CSRIDX(reg->id);
+		ret = _kvm_setcsr(vcpu, reg_idx, &val, 0);
+		if (ret == 0)
+			return ret;
+	}
+
+	switch (reg->id) {
+	case KVM_REG_LOONGARCH_COUNTER:
+		local_irq_save(flags);
+		/*
+		 * gftoffset is relative with board, not vcpu
+		 * only set for the first time for smp system
+		 */
+		if (vcpu->vcpu_id == 0)
+			vcpu->kvm->arch.time_offset = (signed long)(v - drdtime());
+		write_csr_gcntc((ulong)vcpu->kvm->arch.time_offset);
+		local_irq_restore(flags);
+		break;
+	case KVM_REG_LOONGARCH_VCPU_RESET:
+		kvm_reset_timer(vcpu);
+		memset(&vcpu->arch.irq_pending, 0, sizeof(vcpu->arch.irq_pending));
+		memset(&vcpu->arch.irq_clear, 0, sizeof(vcpu->arch.irq_clear));
+		break;
+	default:
+		if ((reg->id & KVM_REG_LOONGARCH_MASK) != KVM_REG_LOONGARCH_CSR)
+			return -EINVAL;
+
+		reg_idx = KVM_GET_IOC_CSRIDX(reg->id);
+		if (reg_idx < CSR_ALL_SIZE)
+			kvm_write_sw_gcsr(csr, reg_idx, v);
+		else
+			return -EINVAL;
+	}
+	return ret;
+}
+
+static int _kvm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
+{
+	s64 v;
+	int ret;
+
+	ret = -EINVAL;
+	if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U64) {
+		u64 __user *uaddr;
+
+		uaddr = (u64 __user *)(long)reg->addr;
+		ret = get_user(v, uaddr);
+	} else if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U32) {
+		u32 __user *uaddr;
+		s32 v32;
+
+		uaddr = (u32 __user *)(long)reg->addr;
+		ret = get_user(v32, uaddr);
+		v = (s64)v32;
+	}
+
+	if (ret)
+		return -EFAULT;
+
+	return _kvm_set_one_reg(vcpu, reg, v);
+}
+
+/*
+ * Read or write a bunch of csrs. All parameters are kernel addresses.
+ *
+ * @return number of csrs set successfully.
+ */
+static int _kvm_csr_io(struct kvm_vcpu *vcpu, struct kvm_csrs *csrs,
+						struct kvm_csr_entry *entries,
+						int (*do_csr)(struct kvm_vcpu *vcpu,
+						unsigned int index, u64 *data, int force))
+{
+	int i;
+
+	for (i = 0; i < csrs->ncsrs; ++i)
+		if (do_csr(vcpu, entries[i].index, &entries[i].data, 1))
+			break;
+
+	return i;
+}
+
+static int kvm_csr_io(struct kvm_vcpu *vcpu, struct kvm_csrs __user *user_csrs,
+						int (*do_csr)(struct kvm_vcpu *vcpu,
+						unsigned int index, u64 *data, int force))
+{
+	struct kvm_csrs csrs;
+	struct kvm_csr_entry *entries;
+	int r, n;
+	unsigned int size;
+
+	r = -EFAULT;
+	if (copy_from_user(&csrs, user_csrs, sizeof(csrs)))
+		goto out;
+
+	r = -E2BIG;
+	if (csrs.ncsrs >= CSR_ALL_SIZE)
+		goto out;
+
+	size = sizeof(struct kvm_csr_entry) * csrs.ncsrs;
+	entries = memdup_user(user_csrs->entries, size);
+	if (IS_ERR(entries)) {
+		r = PTR_ERR(entries);
+		goto out;
+	}
+
+	r = n = _kvm_csr_io(vcpu, &csrs, entries, do_csr);
+	if (r < 0)
+		goto out_free;
+
+	r = -EFAULT;
+	if (copy_to_user(user_csrs->entries, entries, size))
+		goto out_free;
+
+	r = n;
+
+out_free:
+	kfree(entries);
+out:
+	return r;
+}
+
+int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
+				  struct kvm_sregs *sregs)
+{
+	return -ENOIOCTLCMD;
+}
+
+int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
+				  struct kvm_sregs *sregs)
+{
+	return -ENOIOCTLCMD;
+}
+
+int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
+{
+	int i;
+
+	vcpu_load(vcpu);
+
+	for (i = 0; i < ARRAY_SIZE(vcpu->arch.gprs); i++)
+		regs->gpr[i] = vcpu->arch.gprs[i];
+
+	regs->pc = vcpu->arch.pc;
+
+	vcpu_put(vcpu);
+	return 0;
+}
+
+int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
+{
+	int i;
+
+	vcpu_load(vcpu);
+
+	for (i = 1; i < ARRAY_SIZE(vcpu->arch.gprs); i++)
+		vcpu->arch.gprs[i] = regs->gpr[i];
+	vcpu->arch.gprs[0] = 0; /* zero is special, and cannot be set. */
+	vcpu->arch.pc = regs->pc;
+
+	vcpu_put(vcpu);
+	return 0;
+}
+
+long kvm_arch_vcpu_ioctl(struct file *filp,
+			 unsigned int ioctl, unsigned long arg)
+{
+	struct kvm_vcpu *vcpu = filp->private_data;
+	void __user *argp = (void __user *)arg;
+	long r;
+
+	vcpu_load(vcpu);
+
+	switch (ioctl) {
+	case KVM_SET_ONE_REG:
+	case KVM_GET_ONE_REG: {
+		struct kvm_one_reg reg;
+
+		r = -EFAULT;
+		if (copy_from_user(&reg, argp, sizeof(reg)))
+			break;
+		if (ioctl == KVM_SET_ONE_REG)
+			r = _kvm_set_reg(vcpu, &reg);
+		else
+			r = _kvm_get_reg(vcpu, &reg);
+		break;
+	}
+	case KVM_GET_CSRS: {
+		r = kvm_csr_io(vcpu, argp, _kvm_getcsr);
+		break;
+	}
+	case KVM_SET_CSRS: {
+		r = kvm_csr_io(vcpu, argp, _kvm_setcsr);
+		break;
+	}
+	default:
+		r = -ENOIOCTLCMD;
+		break;
+	}
+
+	vcpu_put(vcpu);
+	return r;
+}
+
 int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id)
 {
 	return 0;
-- 
2.31.1