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Message-Id: <20230831083020.2187109-10-zhaotianrui@loongson.cn>
Date: Thu, 31 Aug 2023 16:29:59 +0800
From: Tianrui Zhao <zhaotianrui@...ngson.cn>
To: linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc: Paolo Bonzini <pbonzini@...hat.com>,
Huacai Chen <chenhuacai@...nel.org>,
WANG Xuerui <kernel@...0n.name>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
loongarch@...ts.linux.dev, Jens Axboe <axboe@...nel.dk>,
Mark Brown <broonie@...nel.org>,
Alex Deucher <alexander.deucher@....com>,
Oliver Upton <oliver.upton@...ux.dev>, maobibo@...ngson.cn,
Xi Ruoyao <xry111@...111.site>, zhaotianrui@...ngson.cn
Subject: [PATCH v20 09/30] LoongArch: KVM: Implement vcpu get, vcpu set registers
Implement LoongArch vcpu get registers and set registers operations, it
is called when user space use the ioctl interface to get or set regs.
Reviewed-by: Bibo Mao <maobibo@...ngson.cn>
Signed-off-by: Tianrui Zhao <zhaotianrui@...ngson.cn>
---
arch/loongarch/kvm/csr_ops.S | 67 ++++++++++++
arch/loongarch/kvm/vcpu.c | 206 +++++++++++++++++++++++++++++++++++
2 files changed, 273 insertions(+)
create mode 100644 arch/loongarch/kvm/csr_ops.S
diff --git a/arch/loongarch/kvm/csr_ops.S b/arch/loongarch/kvm/csr_ops.S
new file mode 100644
index 0000000000..53e44b23a5
--- /dev/null
+++ b/arch/loongarch/kvm/csr_ops.S
@@ -0,0 +1,67 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2020-2023 Loongson Technology Corporation Limited
+ */
+
+#include <asm/regdef.h>
+#include <linux/linkage.h>
+ .text
+ .cfi_sections .debug_frame
+/*
+ * we have splited hw gcsr into three parts, so we can
+ * calculate the code offset by gcsrid and jump here to
+ * run the gcsrwr instruction.
+ */
+SYM_FUNC_START(set_hw_gcsr)
+ addi.d t0, a0, 0
+ addi.w t1, zero, 96
+ bltu t1, t0, 1f
+ la.pcrel t0, 10f
+ alsl.d t0, a0, t0, 3
+ jr t0
+1:
+ addi.w t1, a0, -128
+ addi.w t2, zero, 15
+ bltu t2, t1, 2f
+ la.pcrel t0, 11f
+ alsl.d t0, t1, t0, 3
+ jr t0
+2:
+ addi.w t1, a0, -384
+ addi.w t2, zero, 3
+ bltu t2, t1, 3f
+ la.pcrel t0, 12f
+ alsl.d t0, t1, t0, 3
+ jr t0
+3:
+ addi.w a0, zero, -1
+ jr ra
+
+/* range from 0x0(KVM_CSR_CRMD) to 0x60(KVM_CSR_LLBCTL) */
+10:
+ csrnum = 0
+ .rept 0x61
+ gcsrwr a1, csrnum
+ jr ra
+ csrnum = csrnum + 1
+ .endr
+
+/* range from 0x80(KVM_CSR_IMPCTL1) to 0x8f(KVM_CSR_TLBRPRMD) */
+11:
+ csrnum = 0x80
+ .rept 0x10
+ gcsrwr a1, csrnum
+ jr ra
+ csrnum = csrnum + 1
+ .endr
+
+/* range from 0x180(KVM_CSR_DMWIN0) to 0x183(KVM_CSR_DMWIN3) */
+12:
+ csrnum = 0x180
+ .rept 0x4
+ gcsrwr a1, csrnum
+ jr ra
+ csrnum = csrnum + 1
+ .endr
+
+SYM_FUNC_END(set_hw_gcsr)
diff --git a/arch/loongarch/kvm/vcpu.c b/arch/loongarch/kvm/vcpu.c
index ca4e8d074e..f17422a942 100644
--- a/arch/loongarch/kvm/vcpu.c
+++ b/arch/loongarch/kvm/vcpu.c
@@ -13,6 +13,212 @@
#define CREATE_TRACE_POINTS
#include "trace.h"
+int _kvm_getcsr(struct kvm_vcpu *vcpu, unsigned int id, u64 *v)
+{
+ unsigned long val;
+ struct loongarch_csrs *csr = vcpu->arch.csr;
+
+ if (get_gcsr_flag(id) & INVALID_GCSR)
+ return -EINVAL;
+
+ if (id == LOONGARCH_CSR_ESTAT) {
+ /* interrupt status IP0 -- IP7 from GINTC */
+ val = kvm_read_sw_gcsr(csr, LOONGARCH_CSR_GINTC) & 0xff;
+ *v = kvm_read_sw_gcsr(csr, id) | (val << 2);
+ return 0;
+ }
+
+ /*
+ * get software csr state if csrid is valid, since software
+ * csr state is consistent with hardware
+ */
+ *v = kvm_read_sw_gcsr(csr, id);
+
+ return 0;
+}
+
+int _kvm_setcsr(struct kvm_vcpu *vcpu, unsigned int id, u64 val)
+{
+ struct loongarch_csrs *csr = vcpu->arch.csr;
+ int ret = 0, gintc;
+
+ if (get_gcsr_flag(id) & INVALID_GCSR)
+ return -EINVAL;
+
+ if (id == LOONGARCH_CSR_ESTAT) {
+ /* estat IP0~IP7 inject through guestexcept */
+ gintc = (val >> 2) & 0xff;
+ write_csr_gintc(gintc);
+ kvm_set_sw_gcsr(csr, LOONGARCH_CSR_GINTC, gintc);
+
+ gintc = val & ~(0xffUL << 2);
+ write_gcsr_estat(gintc);
+ kvm_set_sw_gcsr(csr, LOONGARCH_CSR_ESTAT, gintc);
+
+ return ret;
+ }
+
+ if (get_gcsr_flag(id) & HW_GCSR) {
+ set_hw_gcsr(id, val);
+ /* write sw gcsr to keep consistent with hardware */
+ kvm_write_sw_gcsr(csr, id, val);
+ } else
+ kvm_write_sw_gcsr(csr, id, val);
+
+ return ret;
+}
+
+static int _kvm_get_one_reg(struct kvm_vcpu *vcpu,
+ const struct kvm_one_reg *reg, s64 *v)
+{
+ int reg_idx, ret = 0;
+
+ if ((reg->id & KVM_REG_LOONGARCH_MASK) == KVM_REG_LOONGARCH_CSR) {
+ reg_idx = KVM_GET_IOC_CSRIDX(reg->id);
+ ret = _kvm_getcsr(vcpu, reg_idx, v);
+ } else if (reg->id == KVM_REG_LOONGARCH_COUNTER)
+ *v = drdtime() + vcpu->kvm->arch.time_offset;
+ else
+ ret = -EINVAL;
+
+ return ret;
+}
+
+static int _kvm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
+{
+ int ret = -EINVAL;
+ s64 v;
+
+ if ((reg->id & KVM_REG_SIZE_MASK) != KVM_REG_SIZE_U64)
+ return ret;
+
+ if (_kvm_get_one_reg(vcpu, reg, &v))
+ return ret;
+
+ return put_user(v, (u64 __user *)(long)reg->addr);
+}
+
+static int _kvm_set_one_reg(struct kvm_vcpu *vcpu,
+ const struct kvm_one_reg *reg,
+ s64 v)
+{
+ int ret = 0;
+ unsigned long flags;
+ u64 val;
+ int reg_idx;
+
+ val = v;
+ if ((reg->id & KVM_REG_LOONGARCH_MASK) == KVM_REG_LOONGARCH_CSR) {
+ reg_idx = KVM_GET_IOC_CSRIDX(reg->id);
+ ret = _kvm_setcsr(vcpu, reg_idx, val);
+ } else if (reg->id == 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);
+ } else if (reg->id == 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));
+ } else
+ ret = -EINVAL;
+
+ return ret;
+}
+
+static int _kvm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
+{
+ s64 v;
+ int ret = -EINVAL;
+
+ if ((reg->id & KVM_REG_SIZE_MASK) != KVM_REG_SIZE_U64)
+ return ret;
+
+ if (get_user(v, (u64 __user *)(long)reg->addr))
+ return ret;
+
+ return _kvm_set_one_reg(vcpu, reg, v);
+}
+
+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(®, argp, sizeof(reg)))
+ break;
+ if (ioctl == KVM_SET_ONE_REG)
+ r = _kvm_set_reg(vcpu, ®);
+ else
+ r = _kvm_get_reg(vcpu, ®);
+ break;
+ }
+ default:
+ r = -ENOIOCTLCMD;
+ break;
+ }
+
+ vcpu_put(vcpu);
+ return r;
+}
+
int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id)
{
return 0;
--
2.27.0
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