| Message ID | 20230609090832.2131037-21-zhaotianrui@loongson.cn (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Add KVM LoongArch support | expand |
Reviewed-by: Bibo Mao <maobibo@loongson.cn> Regards Bibo, Mao 在 2023/6/9 17:08, Tianrui Zhao 写道: > Implement kvm handle LoongArch vcpu exit caused by reading and > writing csr. Using csr structure to emulate the registers. > > Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn> > --- > arch/loongarch/kvm/exit.c | 98 +++++++++++++++++++++++++++++++++++++++ > 1 file changed, 98 insertions(+) > create mode 100644 arch/loongarch/kvm/exit.c > > diff --git a/arch/loongarch/kvm/exit.c b/arch/loongarch/kvm/exit.c > new file mode 100644 > index 000000000000..18635333fc9a > --- /dev/null > +++ b/arch/loongarch/kvm/exit.c > @@ -0,0 +1,98 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * Copyright (C) 2020-2023 Loongson Technology Corporation Limited > + */ > + > +#include <linux/errno.h> > +#include <linux/err.h> > +#include <linux/module.h> > +#include <linux/preempt.h> > +#include <linux/vmalloc.h> > +#include <asm/fpu.h> > +#include <asm/inst.h> > +#include <asm/time.h> > +#include <asm/tlb.h> > +#include <asm/loongarch.h> > +#include <asm/numa.h> > +#include <asm/kvm_vcpu.h> > +#include <asm/kvm_csr.h> > +#include <linux/kvm_host.h> > +#include <asm/mmzone.h> > +#include "trace.h" > + > +static unsigned long _kvm_emu_read_csr(struct kvm_vcpu *vcpu, int csrid) > +{ > + struct loongarch_csrs *csr = vcpu->arch.csr; > + unsigned long val = 0; > + > + if (get_gcsr_flag(csrid) & SW_GCSR) > + val = kvm_read_sw_gcsr(csr, csrid); > + else > + pr_warn_once("Unsupport csrread 0x%x with pc %lx\n", > + csrid, vcpu->arch.pc); > + return val; > +} > + > +static void _kvm_emu_write_csr(struct kvm_vcpu *vcpu, int csrid, > + unsigned long val) > +{ > + struct loongarch_csrs *csr = vcpu->arch.csr; > + > + if (get_gcsr_flag(csrid) & SW_GCSR) > + kvm_write_sw_gcsr(csr, csrid, val); > + else > + pr_warn_once("Unsupport csrwrite 0x%x with pc %lx\n", > + csrid, vcpu->arch.pc); > +} > + > +static void _kvm_emu_xchg_csr(struct kvm_vcpu *vcpu, int csrid, > + unsigned long csr_mask, unsigned long val) > +{ > + struct loongarch_csrs *csr = vcpu->arch.csr; > + > + if (get_gcsr_flag(csrid) & SW_GCSR) { > + unsigned long orig; > + > + orig = kvm_read_sw_gcsr(csr, csrid); > + orig &= ~csr_mask; > + orig |= val & csr_mask; > + kvm_write_sw_gcsr(csr, csrid, orig); > + } else > + pr_warn_once("Unsupport csrxchg 0x%x with pc %lx\n", > + csrid, vcpu->arch.pc); > +} > + > +static int _kvm_handle_csr(struct kvm_vcpu *vcpu, larch_inst inst) > +{ > + unsigned int rd, rj, csrid; > + unsigned long csr_mask; > + unsigned long val = 0; > + > + /* > + * CSR value mask imm > + * rj = 0 means csrrd > + * rj = 1 means csrwr > + * rj != 0,1 means csrxchg > + */ > + rd = inst.reg2csr_format.rd; > + rj = inst.reg2csr_format.rj; > + csrid = inst.reg2csr_format.csr; > + > + /* Process CSR ops */ > + if (rj == 0) { > + /* process csrrd */ > + val = _kvm_emu_read_csr(vcpu, csrid); > + vcpu->arch.gprs[rd] = val; > + } else if (rj == 1) { > + /* process csrwr */ > + val = vcpu->arch.gprs[rd]; > + _kvm_emu_write_csr(vcpu, csrid, val); > + } else { > + /* process csrxchg */ > + val = vcpu->arch.gprs[rd]; > + csr_mask = vcpu->arch.gprs[rj]; > + _kvm_emu_xchg_csr(vcpu, csrid, csr_mask, val); > + } > + > + return EMULATE_DONE; > +}
diff --git a/arch/loongarch/kvm/exit.c b/arch/loongarch/kvm/exit.c new file mode 100644 index 000000000000..18635333fc9a --- /dev/null +++ b/arch/loongarch/kvm/exit.c @@ -0,0 +1,98 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2020-2023 Loongson Technology Corporation Limited + */ + +#include <linux/errno.h> +#include <linux/err.h> +#include <linux/module.h> +#include <linux/preempt.h> +#include <linux/vmalloc.h> +#include <asm/fpu.h> +#include <asm/inst.h> +#include <asm/time.h> +#include <asm/tlb.h> +#include <asm/loongarch.h> +#include <asm/numa.h> +#include <asm/kvm_vcpu.h> +#include <asm/kvm_csr.h> +#include <linux/kvm_host.h> +#include <asm/mmzone.h> +#include "trace.h" + +static unsigned long _kvm_emu_read_csr(struct kvm_vcpu *vcpu, int csrid) +{ + struct loongarch_csrs *csr = vcpu->arch.csr; + unsigned long val = 0; + + if (get_gcsr_flag(csrid) & SW_GCSR) + val = kvm_read_sw_gcsr(csr, csrid); + else + pr_warn_once("Unsupport csrread 0x%x with pc %lx\n", + csrid, vcpu->arch.pc); + return val; +} + +static void _kvm_emu_write_csr(struct kvm_vcpu *vcpu, int csrid, + unsigned long val) +{ + struct loongarch_csrs *csr = vcpu->arch.csr; + + if (get_gcsr_flag(csrid) & SW_GCSR) + kvm_write_sw_gcsr(csr, csrid, val); + else + pr_warn_once("Unsupport csrwrite 0x%x with pc %lx\n", + csrid, vcpu->arch.pc); +} + +static void _kvm_emu_xchg_csr(struct kvm_vcpu *vcpu, int csrid, + unsigned long csr_mask, unsigned long val) +{ + struct loongarch_csrs *csr = vcpu->arch.csr; + + if (get_gcsr_flag(csrid) & SW_GCSR) { + unsigned long orig; + + orig = kvm_read_sw_gcsr(csr, csrid); + orig &= ~csr_mask; + orig |= val & csr_mask; + kvm_write_sw_gcsr(csr, csrid, orig); + } else + pr_warn_once("Unsupport csrxchg 0x%x with pc %lx\n", + csrid, vcpu->arch.pc); +} + +static int _kvm_handle_csr(struct kvm_vcpu *vcpu, larch_inst inst) +{ + unsigned int rd, rj, csrid; + unsigned long csr_mask; + unsigned long val = 0; + + /* + * CSR value mask imm + * rj = 0 means csrrd + * rj = 1 means csrwr + * rj != 0,1 means csrxchg + */ + rd = inst.reg2csr_format.rd; + rj = inst.reg2csr_format.rj; + csrid = inst.reg2csr_format.csr; + + /* Process CSR ops */ + if (rj == 0) { + /* process csrrd */ + val = _kvm_emu_read_csr(vcpu, csrid); + vcpu->arch.gprs[rd] = val; + } else if (rj == 1) { + /* process csrwr */ + val = vcpu->arch.gprs[rd]; + _kvm_emu_write_csr(vcpu, csrid, val); + } else { + /* process csrxchg */ + val = vcpu->arch.gprs[rd]; + csr_mask = vcpu->arch.gprs[rj]; + _kvm_emu_xchg_csr(vcpu, csrid, csr_mask, val); + } + + return EMULATE_DONE; +}
Implement kvm handle LoongArch vcpu exit caused by reading and writing csr. Using csr structure to emulate the registers. Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn> --- arch/loongarch/kvm/exit.c | 98 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 98 insertions(+) create mode 100644 arch/loongarch/kvm/exit.c