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From: Jonathan Behrens <fintelia@gmail.com>
To: Alistair Francis <alistair23@gmail.com>
Cc: Palmer Dabbelt <palmer@sifive.com>,
	"open list:RISC-V" <qemu-riscv@nongnu.org>,
	Anup Patel <Anup.Patel@wdc.com>,
	"qemu-devel@nongnu.org Developers" <qemu-devel@nongnu.org>,
	Atish Patra <Atish.Patra@wdc.com>,
	Alistair Francis <Alistair.Francis@wdc.com>
Subject: Re: [Qemu-devel] [Qemu-riscv] [PATCH v1 10/28] target/riscv: Convert mie and mstatus to pointers
Date: Tue, 17 Sep 2019 21:59:43 -0400
Message-ID: <CANnJOVGPW1ppNdx+=KAvgNhgGQPvJxjyGY=rxunicu=f++xhiQ@mail.gmail.com> (raw)
In-Reply-To: <CAKmqyKMfODSjbBm5ZgmHYYzzrf3B_4WEbANeKXo6rSO6V5Pzeg@mail.gmail.com>

I went through the uses of mie in the entire hypervisor patch series and it
seems like it would be much simpler to just have two non-pointer fields in
the CPU struct: mie and vsie. To if an interrupt is pending, you are either
running with V=0 in which case the contents of vsie can be ignored, or you
are running with V=1 and have to check both anyway. And the
read_sie/write_sie would just need a single extra branch return proper
results. The read_mie and write_mie function wouldn't need to be changed at
all: if M-mode is running to access them, then V=0. (When queried from a
debugger while V=1, I think the result would actually be more correct this
way: the bits of mie are supposed to always reflect sie rather than vsie).

Jonathan

On Tue, Sep 17, 2019 at 7:37 PM Alistair Francis <alistair23@gmail.com>
wrote:

> On Wed, Sep 11, 2019 at 7:55 AM Jonathan Behrens <fintelia@gmail.com>
> wrote:
> >
> > Version 0.4 of the hypervisor spec no longer talks about swapping
> registers. Instead when running in VS-mode some of the supervisor registers
> are "aliased" and actually refer to alternate versions. Implementations are
> of course still allowed to do swapping internally if desired, but it adds
> complexity compared to a more straightforward implementation and isn't
> obvious to me whether QEMU would get any benefit from it. At least, it is
> probably worth fleshing out the rest of the v0.4 implementation before
> deciding on this patch.
>
> This patch is to handle the aliasing. The commit message isn't clear
> (I'll fix that up) but this patch is required to handle the new alias
> method instead of the previous swapping.
>
> Alistair
>
> > Jonathan
> >
> > On Wed, Sep 11, 2019 at 4:24 AM Palmer Dabbelt <palmer@sifive.com>
> wrote:
> >>
> >> On Fri, 23 Aug 2019 16:38:15 PDT (-0700), Alistair Francis wrote:
> >> > To handle the new Hypervisor CSR register swapping let's use pointers.
> >> >
> >> > We only need to convert the MIE and MSTATUS CSRs. With the exception
> of
> >> > MIP all of the other CSRs that swap with virtulsation changes are
> S-Mode
> >> > only, so we can just do a lazy switch. This because more challenging
> for
> >> > the M-Mode registers so it ends up being easier to use pointers.
> >> >
> >> > As the MIP CSR is always accessed atomicly the pointer swap doesn't
> work
> >> > so we leave that as is.
> >> >
> >> > Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
> >> > ---
> >> >  target/riscv/cpu.c        | 16 ++++++++++++----
> >> >  target/riscv/cpu.h        | 12 ++++++++++--
> >> >  target/riscv/cpu_helper.c | 32 ++++++++++++++++----------------
> >> >  target/riscv/csr.c        | 28 ++++++++++++++--------------
> >> >  target/riscv/op_helper.c  | 14 +++++++-------
> >> >  5 files changed, 59 insertions(+), 43 deletions(-)
> >> >
> >> > diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c
> >> > index be8f643fc2..371d5845af 100644
> >> > --- a/target/riscv/cpu.c
> >> > +++ b/target/riscv/cpu.c
> >> > @@ -228,7 +228,7 @@ static void riscv_cpu_dump_state(CPUState *cs,
> FILE *f, int flags)
> >> >      qemu_fprintf(f, " %s " TARGET_FMT_lx "\n", "pc      ", env->pc);
> >> >  #ifndef CONFIG_USER_ONLY
> >> >      qemu_fprintf(f, " %s " TARGET_FMT_lx "\n", "mhartid ",
> env->mhartid);
> >> > -    qemu_fprintf(f, " %s " TARGET_FMT_lx "\n", "mstatus ",
> env->mstatus);
> >> > +    qemu_fprintf(f, " %s " TARGET_FMT_lx "\n", "mstatus ",
> *env->mstatus);
> >> >      if (riscv_has_ext(env, RVH)) {
> >> >          qemu_fprintf(f, " %s " TARGET_FMT_lx "\n", "hstatus ",
> env->hstatus);
> >> >          qemu_fprintf(f, " %s " TARGET_FMT_lx "\n", "bstatus ",
> env->vsstatus);
> >> > @@ -239,7 +239,7 @@ static void riscv_cpu_dump_state(CPUState *cs,
> FILE *f, int flags)
> >> >          qemu_fprintf(f, " %s " TARGET_FMT_lx "\n", "vsip    ",
> >> >                       (target_ulong)atomic_read(&env->vsip));
> >> >      }
> >> > -    qemu_fprintf(f, " %s " TARGET_FMT_lx "\n", "mie     ", env->mie);
> >> > +    qemu_fprintf(f, " %s " TARGET_FMT_lx "\n", "mie     ",
> *env->mie);
> >> >      if (riscv_has_ext(env, RVH)) {
> >> >          qemu_fprintf(f, " %s " TARGET_FMT_lx "\n", "vsie    ",
> env->vsie);
> >> >      }
> >> > @@ -309,7 +309,7 @@ static bool riscv_cpu_has_work(CPUState *cs)
> >> >       * Definition of the WFI instruction requires it to ignore the
> privilege
> >> >       * mode and delegation registers, but respect individual enables
> >> >       */
> >> > -    return (atomic_read(&env->mip) & env->mie) != 0;
> >> > +    return (atomic_read(&env->mip) & *env->mie) != 0;
> >> >  #else
> >> >      return true;
> >> >  #endif
> >> > @@ -330,7 +330,7 @@ static void riscv_cpu_reset(CPUState *cs)
> >> >      mcc->parent_reset(cs);
> >> >  #ifndef CONFIG_USER_ONLY
> >> >      env->priv = PRV_M;
> >> > -    env->mstatus &= ~(MSTATUS_MIE | MSTATUS_MPRV);
> >> > +    *env->mstatus &= ~(MSTATUS_MIE | MSTATUS_MPRV);
> >> >      env->mcause = 0;
> >> >      env->pc = env->resetvec;
> >> >  #endif
> >> > @@ -459,8 +459,16 @@ static void riscv_cpu_realize(DeviceState *dev,
> Error **errp)
> >> >  static void riscv_cpu_init(Object *obj)
> >> >  {
> >> >      RISCVCPU *cpu = RISCV_CPU(obj);
> >> > +#ifndef CONFIG_USER_ONLY
> >> > +    CPURISCVState *env = &cpu->env;
> >> > +#endif
> >> >
> >> >      cpu_set_cpustate_pointers(cpu);
> >> > +
> >> > +#ifndef CONFIG_USER_ONLY
> >> > +    env->mie = &env->mie_novirt;
> >> > +    env->mstatus = &env->mstatus_novirt;
> >> > +#endif
> >> >  }
> >> >
> >> >  static const VMStateDescription vmstate_riscv_cpu = {
> >> > diff --git a/target/riscv/cpu.h b/target/riscv/cpu.h
> >> > index 4c342e7a79..680592cb60 100644
> >> > --- a/target/riscv/cpu.h
> >> > +++ b/target/riscv/cpu.h
> >> > @@ -122,7 +122,7 @@ struct CPURISCVState {
> >> >      target_ulong resetvec;
> >> >
> >> >      target_ulong mhartid;
> >> > -    target_ulong mstatus;
> >> > +    target_ulong *mstatus;
> >> >
> >> >      /*
> >> >       * CAUTION! Unlike the rest of this struct, mip is accessed
> asynchonously
> >> > @@ -136,7 +136,7 @@ struct CPURISCVState {
> >> >      uint32_t mip;
> >> >      uint32_t miclaim;
> >> >
> >> > -    target_ulong mie;
> >> > +    target_ulong *mie;
> >> >      target_ulong mideleg;
> >> >
> >> >      target_ulong sptbr;  /* until: priv-1.9.1 */
> >> > @@ -154,6 +154,14 @@ struct CPURISCVState {
> >> >      target_ulong mcause;
> >> >      target_ulong mtval;  /* since: priv-1.10.0 */
> >> >
> >> > +    /* The following registers are the "real" versions that the
> pointer
> >> > +     * versions point to. These should never be used unless you know
> what you
> >> > +     * are doing. To access these use the pointer versions instead.
> This is
> >> > +     * required to handle the Hypervisor register swapping.
> >> > +     */
> >> > +    target_ulong mie_novirt;
> >> > +    target_ulong mstatus_novirt;
> >> > +
> >> >      /* Hypervisor CSRs */
> >> >      target_ulong hstatus;
> >> >      target_ulong hedeleg;
> >> > diff --git a/target/riscv/cpu_helper.c b/target/riscv/cpu_helper.c
> >> > index 5bcfc2e090..c597523d74 100644
> >> > --- a/target/riscv/cpu_helper.c
> >> > +++ b/target/riscv/cpu_helper.c
> >> > @@ -36,9 +36,9 @@ int riscv_cpu_mmu_index(CPURISCVState *env, bool
> ifetch)
> >> >  #ifndef CONFIG_USER_ONLY
> >> >  static int riscv_cpu_local_irq_pending(CPURISCVState *env)
> >> >  {
> >> > -    target_ulong mstatus_mie = get_field(env->mstatus, MSTATUS_MIE);
> >> > -    target_ulong mstatus_sie = get_field(env->mstatus, MSTATUS_SIE);
> >> > -    target_ulong pending = atomic_read(&env->mip) & env->mie;
> >> > +    target_ulong mstatus_mie = get_field(*env->mstatus, MSTATUS_MIE);
> >> > +    target_ulong mstatus_sie = get_field(*env->mstatus, MSTATUS_SIE);
> >> > +    target_ulong pending = atomic_read(env->mip) & *env->mie;
> >> >      target_ulong mie = env->priv < PRV_M || (env->priv == PRV_M &&
> mstatus_mie);
> >> >      target_ulong sie = env->priv < PRV_S || (env->priv == PRV_S &&
> mstatus_sie);
> >> >      target_ulong irqs = (pending & ~env->mideleg & -mie) |
> >> > @@ -74,7 +74,7 @@ bool riscv_cpu_exec_interrupt(CPUState *cs, int
> interrupt_request)
> >> >  /* Return true is floating point support is currently enabled */
> >> >  bool riscv_cpu_fp_enabled(CPURISCVState *env)
> >> >  {
> >> > -    if (env->mstatus & MSTATUS_FS) {
> >> > +    if (*env->mstatus & MSTATUS_FS) {
> >> >          return true;
> >> >      }
> >> >
> >> > @@ -219,8 +219,8 @@ static int get_physical_address(CPURISCVState
> *env, hwaddr *physical,
> >> >      int mode = mmu_idx;
> >> >
> >> >      if (mode == PRV_M && access_type != MMU_INST_FETCH) {
> >> > -        if (get_field(env->mstatus, MSTATUS_MPRV)) {
> >> > -            mode = get_field(env->mstatus, MSTATUS_MPP);
> >> > +        if (get_field(*env->mstatus, MSTATUS_MPRV)) {
> >> > +            mode = get_field(*env->mstatus, MSTATUS_MPP);
> >> >          }
> >> >      }
> >> >
> >> > @@ -234,11 +234,11 @@ static int get_physical_address(CPURISCVState
> *env, hwaddr *physical,
> >> >
> >> >      target_ulong base;
> >> >      int levels, ptidxbits, ptesize, vm, sum;
> >> > -    int mxr = get_field(env->mstatus, MSTATUS_MXR);
> >> > +    int mxr = get_field(*env->mstatus, MSTATUS_MXR);
> >> >
> >> >      if (env->priv_ver >= PRIV_VERSION_1_10_0) {
> >> >          base = get_field(env->satp, SATP_PPN) << PGSHIFT;
> >> > -        sum = get_field(env->mstatus, MSTATUS_SUM);
> >> > +        sum = get_field(*env->mstatus, MSTATUS_SUM);
> >> >          vm = get_field(env->satp, SATP_MODE);
> >> >          switch (vm) {
> >> >          case VM_1_10_SV32:
> >> > @@ -258,8 +258,8 @@ static int get_physical_address(CPURISCVState
> *env, hwaddr *physical,
> >> >          }
> >> >      } else {
> >> >          base = env->sptbr << PGSHIFT;
> >> > -        sum = !get_field(env->mstatus, MSTATUS_PUM);
> >> > -        vm = get_field(env->mstatus, MSTATUS_VM);
> >> > +        sum = !get_field(*env->mstatus, MSTATUS_PUM);
> >> > +        vm = get_field(*env->mstatus, MSTATUS_VM);
> >> >          switch (vm) {
> >> >          case VM_1_09_SV32:
> >> >            levels = 2; ptidxbits = 10; ptesize = 4; break;
> >> > @@ -505,8 +505,8 @@ bool riscv_cpu_tlb_fill(CPUState *cs, vaddr
> address, int size,
> >> >      ret = get_physical_address(env, &pa, &prot, address,
> access_type, mmu_idx);
> >> >
> >> >      if (mode == PRV_M && access_type != MMU_INST_FETCH) {
> >> > -        if (get_field(env->mstatus, MSTATUS_MPRV)) {
> >> > -            mode = get_field(env->mstatus, MSTATUS_MPP);
> >> > +        if (get_field(*env->mstatus, MSTATUS_MPRV)) {
> >> > +            mode = get_field(*env->mstatus, MSTATUS_MPP);
> >> >          }
> >> >      }
> >> >
> >> > @@ -606,12 +606,12 @@ void riscv_cpu_do_interrupt(CPUState *cs)
> >> >      if (env->priv <= PRV_S &&
> >> >              cause < TARGET_LONG_BITS && ((deleg >> cause) & 1)) {
> >> >          /* handle the trap in S-mode */
> >> > -        target_ulong s = env->mstatus;
> >> > +        target_ulong s = *env->mstatus;
> >> >          s = set_field(s, MSTATUS_SPIE, env->priv_ver >=
> PRIV_VERSION_1_10_0 ?
> >> >              get_field(s, MSTATUS_SIE) : get_field(s, MSTATUS_UIE <<
> env->priv));
> >> >          s = set_field(s, MSTATUS_SPP, env->priv);
> >> >          s = set_field(s, MSTATUS_SIE, 0);
> >> > -        env->mstatus = s;
> >> > +        *env->mstatus = s;
> >> >          env->scause = cause | ((target_ulong)async <<
> (TARGET_LONG_BITS - 1));
> >> >          env->sepc = env->pc;
> >> >          env->sbadaddr = tval;
> >> > @@ -620,12 +620,12 @@ void riscv_cpu_do_interrupt(CPUState *cs)
> >> >          riscv_cpu_set_mode(env, PRV_S);
> >> >      } else {
> >> >          /* handle the trap in M-mode */
> >> > -        target_ulong s = env->mstatus;
> >> > +        target_ulong s = *env->mstatus;
> >> >          s = set_field(s, MSTATUS_MPIE, env->priv_ver >=
> PRIV_VERSION_1_10_0 ?
> >> >              get_field(s, MSTATUS_MIE) : get_field(s, MSTATUS_UIE <<
> env->priv));
> >> >          s = set_field(s, MSTATUS_MPP, env->priv);
> >> >          s = set_field(s, MSTATUS_MIE, 0);
> >> > -        env->mstatus = s;
> >> > +        *env->mstatus = s;
> >> >          env->mcause = cause | ~(((target_ulong)-1) >> async);
> >> >          env->mepc = env->pc;
> >> >          env->mbadaddr = tval;
> >> > diff --git a/target/riscv/csr.c b/target/riscv/csr.c
> >> > index e2e908fbc0..30ec8c0a8e 100644
> >> > --- a/target/riscv/csr.c
> >> > +++ b/target/riscv/csr.c
> >> > @@ -136,7 +136,7 @@ static int write_fflags(CPURISCVState *env, int
> csrno, target_ulong val)
> >> >      if (!env->debugger && !riscv_cpu_fp_enabled(env)) {
> >> >          return -1;
> >> >      }
> >> > -    env->mstatus |= MSTATUS_FS;
> >> > +    *env->mstatus |= MSTATUS_FS;
> >> >  #endif
> >> >      riscv_cpu_set_fflags(env, val & (FSR_AEXC >> FSR_AEXC_SHIFT));
> >> >      return 0;
> >> > @@ -159,7 +159,7 @@ static int write_frm(CPURISCVState *env, int
> csrno, target_ulong val)
> >> >      if (!env->debugger && !riscv_cpu_fp_enabled(env)) {
> >> >          return -1;
> >> >      }
> >> > -    env->mstatus |= MSTATUS_FS;
> >> > +    *env->mstatus |= MSTATUS_FS;
> >> >  #endif
> >> >      env->frm = val & (FSR_RD >> FSR_RD_SHIFT);
> >> >      return 0;
> >> > @@ -183,7 +183,7 @@ static int write_fcsr(CPURISCVState *env, int
> csrno, target_ulong val)
> >> >      if (!env->debugger && !riscv_cpu_fp_enabled(env)) {
> >> >          return -1;
> >> >      }
> >> > -    env->mstatus |= MSTATUS_FS;
> >> > +    *env->mstatus |= MSTATUS_FS;
> >> >  #endif
> >> >      env->frm = (val & FSR_RD) >> FSR_RD_SHIFT;
> >> >      riscv_cpu_set_fflags(env, (val & FSR_AEXC) >> FSR_AEXC_SHIFT);
> >> > @@ -307,7 +307,7 @@ static int read_mhartid(CPURISCVState *env, int
> csrno, target_ulong *val)
> >> >  /* Machine Trap Setup */
> >> >  static int read_mstatus(CPURISCVState *env, int csrno, target_ulong
> *val)
> >> >  {
> >> > -    *val = env->mstatus;
> >> > +    *val = *env->mstatus;
> >> >      return 0;
> >> >  }
> >> >
> >> > @@ -319,7 +319,7 @@ static int validate_vm(CPURISCVState *env,
> target_ulong vm)
> >> >
> >> >  static int write_mstatus(CPURISCVState *env, int csrno, target_ulong
> val)
> >> >  {
> >> > -    target_ulong mstatus = env->mstatus;
> >> > +    target_ulong mstatus = *env->mstatus;
> >> >      target_ulong mask = 0;
> >> >      int dirty;
> >> >
> >> > @@ -359,7 +359,7 @@ static int write_mstatus(CPURISCVState *env, int
> csrno, target_ulong val)
> >> >               ((mstatus & MSTATUS_FS) == MSTATUS_FS)) |
> >> >              ((mstatus & MSTATUS_XS) == MSTATUS_XS);
> >> >      mstatus = set_field(mstatus, MSTATUS_SD, dirty);
> >> > -    env->mstatus = mstatus;
> >> > +    *env->mstatus = mstatus;
> >> >
> >> >      return 0;
> >> >  }
> >> > @@ -448,13 +448,13 @@ static int write_mideleg(CPURISCVState *env,
> int csrno, target_ulong val)
> >> >
> >> >  static int read_mie(CPURISCVState *env, int csrno, target_ulong *val)
> >> >  {
> >> > -    *val = env->mie;
> >> > +    *val = *env->mie;
> >> >      return 0;
> >> >  }
> >> >
> >> >  static int write_mie(CPURISCVState *env, int csrno, target_ulong val)
> >> >  {
> >> > -    env->mie = (env->mie & ~all_ints) | (val & all_ints);
> >> > +    *env->mie = (*env->mie & ~all_ints) | (val & all_ints);
> >> >      return 0;
> >> >  }
> >> >
> >> > @@ -608,7 +608,7 @@ static int read_sstatus(CPURISCVState *env, int
> csrno, target_ulong *val)
> >> >  {
> >> >      target_ulong mask = ((env->priv_ver >= PRIV_VERSION_1_10_0) ?
> >> >                           sstatus_v1_10_mask : sstatus_v1_9_mask);
> >> > -    *val = env->mstatus & mask;
> >> > +    *val = *env->mstatus & mask;
> >> >      return 0;
> >> >  }
> >> >
> >> > @@ -616,19 +616,19 @@ static int write_sstatus(CPURISCVState *env,
> int csrno, target_ulong val)
> >> >  {
> >> >      target_ulong mask = ((env->priv_ver >= PRIV_VERSION_1_10_0) ?
> >> >                           sstatus_v1_10_mask : sstatus_v1_9_mask);
> >> > -    target_ulong newval = (env->mstatus & ~mask) | (val & mask);
> >> > +    target_ulong newval = (*env->mstatus & ~mask) | (val & mask);
> >> >      return write_mstatus(env, CSR_MSTATUS, newval);
> >> >  }
> >> >
> >> >  static int read_sie(CPURISCVState *env, int csrno, target_ulong *val)
> >> >  {
> >> > -    *val = env->mie & env->mideleg;
> >> > +    *val = *env->mie & env->mideleg;
> >> >      return 0;
> >> >  }
> >> >
> >> >  static int write_sie(CPURISCVState *env, int csrno, target_ulong val)
> >> >  {
> >> > -    target_ulong newval = (env->mie & ~env->mideleg) | (val &
> env->mideleg);
> >> > +    target_ulong newval = (*env->mie & ~env->mideleg) | (val &
> env->mideleg);
> >> >      return write_mie(env, CSR_MIE, newval);
> >> >  }
> >> >
> >> > @@ -731,7 +731,7 @@ static int read_satp(CPURISCVState *env, int
> csrno, target_ulong *val)
> >> >      if (!riscv_feature(env, RISCV_FEATURE_MMU)) {
> >> >          *val = 0;
> >> >      } else if (env->priv_ver >= PRIV_VERSION_1_10_0) {
> >> > -        if (env->priv == PRV_S && get_field(env->mstatus,
> MSTATUS_TVM)) {
> >> > +        if (env->priv == PRV_S && get_field(*env->mstatus,
> MSTATUS_TVM)) {
> >> >              return -1;
> >> >          } else {
> >> >              *val = env->satp;
> >> > @@ -756,7 +756,7 @@ static int write_satp(CPURISCVState *env, int
> csrno, target_ulong val)
> >> >          validate_vm(env, get_field(val, SATP_MODE)) &&
> >> >          ((val ^ env->satp) & (SATP_MODE | SATP_ASID | SATP_PPN)))
> >> >      {
> >> > -        if (env->priv == PRV_S && get_field(env->mstatus,
> MSTATUS_TVM)) {
> >> > +        if (env->priv == PRV_S && get_field(*env->mstatus,
> MSTATUS_TVM)) {
> >> >              return -1;
> >> >          } else {
> >> >              if((val ^ env->satp) & SATP_ASID) {
> >> > diff --git a/target/riscv/op_helper.c b/target/riscv/op_helper.c
> >> > index 331cc36232..d150551bc9 100644
> >> > --- a/target/riscv/op_helper.c
> >> > +++ b/target/riscv/op_helper.c
> >> > @@ -83,11 +83,11 @@ target_ulong helper_sret(CPURISCVState *env,
> target_ulong cpu_pc_deb)
> >> >      }
> >> >
> >> >      if (env->priv_ver >= PRIV_VERSION_1_10_0 &&
> >> > -        get_field(env->mstatus, MSTATUS_TSR)) {
> >> > +        get_field(*env->mstatus, MSTATUS_TSR)) {
> >> >          riscv_raise_exception(env, RISCV_EXCP_ILLEGAL_INST, GETPC());
> >> >      }
> >> >
> >> > -    target_ulong mstatus = env->mstatus;
> >> > +    target_ulong mstatus = *env->mstatus;
> >> >      target_ulong prev_priv = get_field(mstatus, MSTATUS_SPP);
> >> >      mstatus = set_field(mstatus,
> >> >          env->priv_ver >= PRIV_VERSION_1_10_0 ?
> >> > @@ -96,7 +96,7 @@ target_ulong helper_sret(CPURISCVState *env,
> target_ulong cpu_pc_deb)
> >> >      mstatus = set_field(mstatus, MSTATUS_SPIE, 0);
> >> >      mstatus = set_field(mstatus, MSTATUS_SPP, PRV_U);
> >> >      riscv_cpu_set_mode(env, prev_priv);
> >> > -    env->mstatus = mstatus;
> >> > +    *env->mstatus = mstatus;
> >> >
> >> >      return retpc;
> >> >  }
> >> > @@ -112,7 +112,7 @@ target_ulong helper_mret(CPURISCVState *env,
> target_ulong cpu_pc_deb)
> >> >          riscv_raise_exception(env, RISCV_EXCP_INST_ADDR_MIS,
> GETPC());
> >> >      }
> >> >
> >> > -    target_ulong mstatus = env->mstatus;
> >> > +    target_ulong mstatus = *env->mstatus;
> >> >      target_ulong prev_priv = get_field(mstatus, MSTATUS_MPP);
> >> >      mstatus = set_field(mstatus,
> >> >          env->priv_ver >= PRIV_VERSION_1_10_0 ?
> >> > @@ -121,7 +121,7 @@ target_ulong helper_mret(CPURISCVState *env,
> target_ulong cpu_pc_deb)
> >> >      mstatus = set_field(mstatus, MSTATUS_MPIE, 0);
> >> >      mstatus = set_field(mstatus, MSTATUS_MPP, PRV_U);
> >> >      riscv_cpu_set_mode(env, prev_priv);
> >> > -    env->mstatus = mstatus;
> >> > +    *env->mstatus = mstatus;
> >> >
> >> >      return retpc;
> >> >  }
> >> > @@ -132,7 +132,7 @@ void helper_wfi(CPURISCVState *env)
> >> >
> >> >      if (env->priv == PRV_S &&
> >> >          env->priv_ver >= PRIV_VERSION_1_10_0 &&
> >> > -        get_field(env->mstatus, MSTATUS_TW)) {
> >> > +        get_field(*env->mstatus, MSTATUS_TW)) {
> >> >          riscv_raise_exception(env, RISCV_EXCP_ILLEGAL_INST, GETPC());
> >> >      } else {
> >> >          cs->halted = 1;
> >> > @@ -147,7 +147,7 @@ void helper_tlb_flush(CPURISCVState *env)
> >> >      if (!(env->priv >= PRV_S) ||
> >> >          (env->priv == PRV_S &&
> >> >           env->priv_ver >= PRIV_VERSION_1_10_0 &&
> >> > -         get_field(env->mstatus, MSTATUS_TVM))) {
> >> > +         get_field(*env->mstatus, MSTATUS_TVM))) {
> >> >          riscv_raise_exception(env, RISCV_EXCP_ILLEGAL_INST, GETPC());
> >> >      } else {
> >> >          tlb_flush(cs);
> >>
> >> I don't think this is that bad.
> >>
> >> Reviewed-by: Palmer Dabbelt <palmer@sifive.com>
> >>
>

  reply index

Thread overview: 75+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-23 23:37 [Qemu-devel] [PATCH v1 00/28] Add RISC-V Hypervisor Extension v0.4 Alistair Francis
2019-08-23 23:37 ` [Qemu-devel] [PATCH v1 01/28] target/riscv: Add the Hypervisor extension Alistair Francis
2019-08-27 15:26   ` Chih-Min Chao
2019-09-10 13:43   ` Palmer Dabbelt
2019-08-23 23:37 ` [Qemu-devel] [PATCH v1 02/28] target/riscv: Add the virtulisation mode Alistair Francis
2019-08-27 15:44   ` [Qemu-devel] [Qemu-riscv] " Chih-Min Chao
2019-08-28  0:08     ` Alistair Francis
2019-09-10 13:44   ` [Qemu-devel] " Palmer Dabbelt
2019-09-16 15:57     ` Alistair Francis
2019-08-23 23:37 ` [Qemu-devel] [PATCH v1 03/28] target/riscv: Add the force HS exception mode Alistair Francis
2019-08-27 15:46   ` Chih-Min Chao
2019-09-10 14:48   ` Palmer Dabbelt
2019-08-23 23:38 ` [Qemu-devel] [PATCH v1 04/28] target/riscv: Fix CSR perm checking for HS mode Alistair Francis
2019-09-10 14:48   ` Palmer Dabbelt
2019-10-16 20:56     ` Alistair Francis
2019-08-23 23:38 ` [Qemu-devel] [PATCH v1 05/28] target/riscv: Add the Hypervisor CSRs to CPUState Alistair Francis
2019-08-27 15:50   ` [Qemu-devel] [Qemu-riscv] " Chih-Min Chao
2019-09-10 14:48   ` [Qemu-devel] " Palmer Dabbelt
2019-08-23 23:38 ` [Qemu-devel] [PATCH v1 06/28] target/riscv: Print priv and virt in disas log Alistair Francis
2019-09-10 14:48   ` Palmer Dabbelt
2019-08-23 23:38 ` [Qemu-devel] [PATCH v1 07/28] target/riscv: Dump Hypervisor registers if enabled Alistair Francis
2019-09-10 14:48   ` Palmer Dabbelt
2019-08-23 23:38 ` [Qemu-devel] [PATCH v1 08/28] target/riscv: Add Hypervisor CSR access functions Alistair Francis
2019-09-10 14:48   ` Palmer Dabbelt
2019-08-23 23:38 ` [Qemu-devel] [PATCH v1 09/28] target/riscv: Add Hypervisor virtual CSRs accesses Alistair Francis
2019-09-10 14:48   ` Palmer Dabbelt
2019-08-23 23:38 ` [Qemu-devel] [PATCH v1 10/28] target/riscv: Convert mie and mstatus to pointers Alistair Francis
2019-09-11  8:24   ` Palmer Dabbelt
2019-09-11 14:54     ` [Qemu-devel] [Qemu-riscv] " Jonathan Behrens
2019-09-17 23:33       ` Alistair Francis
2019-09-18  1:59         ` Jonathan Behrens [this message]
2019-09-18 23:47           ` Alistair Francis
2019-09-19 14:50             ` Richard Henderson
2019-09-19 16:58               ` Jonathan Behrens
2019-10-25 20:28                 ` Alistair Francis
2019-08-23 23:38 ` [Qemu-devel] [PATCH v1 11/28] target/riscv: Add background register swapping function Alistair Francis
2019-09-11 14:17   ` Palmer Dabbelt
2019-08-23 23:38 ` [Qemu-devel] [PATCH v1 12/28] target/riscv: Add support for virtual interrupt setting Alistair Francis
2019-09-14 20:30   ` Palmer Dabbelt
2019-08-23 23:38 ` [Qemu-devel] [PATCH v1 13/28] target/ricsv: Flush the TLB on virtulisation mode changes Alistair Francis
2019-09-14 20:30   ` Palmer Dabbelt
2019-08-23 23:38 ` [Qemu-devel] [PATCH v1 14/28] target/riscv: Generate illegal instruction on WFI when V=1 Alistair Francis
2019-09-14 20:30   ` Palmer Dabbelt
2019-08-23 23:38 ` [Qemu-devel] [PATCH v1 15/28] riscv: plic: Always set sip.SEIP bit for HS Alistair Francis
2019-09-14 20:32   ` Palmer Dabbelt
2019-08-23 23:38 ` [Qemu-devel] [PATCH v1 16/28] target/riscv: Add hypvervisor trap support Alistair Francis
2019-09-20 14:01   ` Palmer Dabbelt
2019-08-23 23:38 ` [Qemu-devel] [PATCH v1 17/28] target/riscv: Add Hypervisor trap return support Alistair Francis
2019-10-01 18:33   ` Palmer Dabbelt
2019-08-23 23:38 ` [Qemu-devel] [PATCH v1 18/28] target/riscv: Add hfence instructions Alistair Francis
2019-10-01 18:34   ` Palmer Dabbelt
2019-08-23 23:38 ` [Qemu-devel] [PATCH v1 19/28] target/riscv: Disable guest FP support based on virtual status Alistair Francis
2019-10-01 18:34   ` Palmer Dabbelt
2019-08-23 23:38 ` [Qemu-devel] [PATCH v1 20/28] target/riscv: Mark both sstatus and vsstatus as dirty Alistair Francis
2019-10-01 18:34   ` Palmer Dabbelt
2019-08-23 23:38 ` [Qemu-devel] [PATCH v1 21/28] target/riscv: Respect MPRV and SPRV for floating point ops Alistair Francis
2019-10-02 23:52   ` Palmer Dabbelt
2019-10-16 21:01     ` Alistair Francis
2019-08-23 23:38 ` [Qemu-devel] [PATCH v1 22/28] target/riscv: Allow specifying MMU stage Alistair Francis
2019-10-03 15:53   ` Palmer Dabbelt
2019-10-07 18:05     ` Alistair Francis
2019-10-16 19:02       ` Palmer Dabbelt
2019-10-16 21:25         ` Alistair Francis
2019-08-23 23:38 ` [Qemu-devel] [PATCH v1 23/28] target/riscv: Allow specifying number of MMU stages Alistair Francis
2019-08-23 23:38 ` [Qemu-devel] [PATCH v1 24/28] target/riscv: Implement second stage MMU Alistair Francis
2019-10-07 16:15   ` Palmer Dabbelt
2019-08-23 23:38 ` [Qemu-devel] [PATCH v1 25/28] target/riscv: Call the second stage MMU in virtualisation mode Alistair Francis
2019-10-08 17:54   ` Palmer Dabbelt
2019-08-23 23:38 ` [Qemu-devel] [PATCH v1 26/28] target/riscv: Add support for the 32-bit MSTATUSH CSR Alistair Francis
2019-10-08 18:36   ` Palmer Dabbelt
2019-08-23 23:39 ` [Qemu-devel] [PATCH v1 27/28] target/riscv: Add the MSTATUS_MPV_ISSET helper macro Alistair Francis
2019-10-08 18:36   ` Palmer Dabbelt
2019-10-16 21:14     ` Alistair Francis
2019-08-23 23:39 ` [Qemu-devel] [PATCH v1 28/28] target/riscv: Allow enabling the Hypervisor extension Alistair Francis
2019-10-08 18:53   ` Palmer Dabbelt

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