Re: [Qemu-devel] [PATCH] configure: Define target access alignment in configure

[Paolo Bonzini <pbonzini@redhat.com>]

On 19/07/19 11:17, Aleksandar Markovic wrote:
> 
> On Jul 18, 2019 11:55 AM, "Paolo Bonzini" <pbonzini@redhat.com
> <mailto:pbonzini@redhat.com>> wrote:
>>
>> On 18/07/19 08:01, tony.nguyen@bt.com <mailto:tony.nguyen@bt.com> wrote:
>> > This patch moves the define of target access alignment earlier from
>> > target/foo/cpu.h to configure.
>> >
>> > Suggested in Richard Henderson's reply to "[PATCH 1/4] tcg: TCGMemOp
> is now
>> > accelerator independent MemOp"
>> >
>> > Signed-off-by: Tony Nguyen <tony.nguyen@bt.com
> <mailto:tony.nguyen@bt.com>>
>> > ---
>> >  configure             | 12 ++++++++++--
>> >  include/exec/poison.h |  1 +
>> >  include/qom/cpu.h     |  2 +-
>> >  target/alpha/cpu.h    |  2 --
>> >  target/hppa/cpu.h     |  1 -
>> >  target/mips/cpu.h     |  2 --
>> >  target/sh4/cpu.h      |  2 --
>> >  target/sparc/cpu.h    |  2 --
>> >  target/xtensa/cpu.h   |  2 --
>> >  tcg/tcg.c             |  2 +-
>> >  tcg/tcg.h             |  8 +++++---
>> >  11 files changed, 18 insertions(+), 18 deletions(-)
>> >
>> > diff --git a/configure b/configure
>> > index eb635c3b9a..c07687c656 100755
>> > --- a/configure
>> > +++ b/configure
>> > @@ -7424,11 +7424,16 @@ for target in $target_list; do
>> >  target_dir="$target"
>> >  config_target_mak=$target_dir/config-target.mak
>> >  target_name=$(echo $target | cut -d '-' -f 1)
>> > +target_aligned_only="no"
>> > +case "$target_name" in
>> > + 
> alpha|hppa|mips64el|mips64|mipsel|mips|mipsn32|mipsn32el|sh4|sh4eb|sparc|sparc64|sparc32plus|xtensa|xtensaeb)
>> > +  target_aligned_only="yes"
>> > +  ;;
>> > +esac
>> >  target_bigendian="no"
>> > -
>> >  case "$target_name" in
>> >   
> armeb|aarch64_be|hppa|lm32|m68k|microblaze|mips|mipsn32|mips64|moxie|or1k|ppc|ppc64|ppc64abi32|s390x|sh4eb|sparc|sparc64|sparc32plus|xtensaeb)
>> > -  target_bigendian=yes
>> > +  target_bigendian="yes"
>> >    ;;
>> >  esac
>> >  target_softmmu="no"
>> > @@ -7710,6 +7715,9 @@ fi
>> >  if supported_whpx_target $target; then
>> >      echo "CONFIG_WHPX=y" >> $config_target_mak
>> >  fi
>> > +if test "$target_aligned_only" = "yes" ; then
>> > +  echo "TARGET_ALIGNED_ONLY=y" >> $config_target_mak
>> > +fi
>> >  if test "$target_bigendian" = "yes" ; then
>> >    echo "TARGET_WORDS_BIGENDIAN=y" >> $config_target_mak
>> >  fi
>> > diff --git a/include/exec/poison.h b/include/exec/poison.h
>> > index b862320fa6..955eb863ab 100644
>> > --- a/include/exec/poison.h
>> > +++ b/include/exec/poison.h
>> > @@ -35,6 +35,7 @@
>> >  #pragma GCC poison TARGET_UNICORE32
>> >  #pragma GCC poison TARGET_XTENSA
>> > 
>> > +#pragma GCC poison TARGET_ALIGNED_ONLY
>> >  #pragma GCC poison TARGET_HAS_BFLT
>> >  #pragma GCC poison TARGET_NAME
>> >  #pragma GCC poison TARGET_SUPPORTS_MTTCG
>> > diff --git a/include/qom/cpu.h b/include/qom/cpu.h
>> > index 5ee0046b62..9b50b73339 100644
>> > --- a/include/qom/cpu.h
>> > +++ b/include/qom/cpu.h
>> > @@ -89,7 +89,7 @@ struct TranslationBlock;
>> >   * @do_unassigned_access: Callback for unassigned access handling.
>> >   * (this is deprecated: new targets should use
> do_transaction_failed instead)
>> >   * @do_unaligned_access: Callback for unaligned access handling, if
>> > - * the target defines #ALIGNED_ONLY.
>> > + * the target defines #TARGET_ALIGNED_ONLY.
>> >   * @do_transaction_failed: Callback for handling failed memory
> transactions
>> >   * (ie bus faults or external aborts; not MMU faults)
>> >   * @virtio_is_big_endian: Callback to return %true if a CPU which
> supports
>> > diff --git a/target/alpha/cpu.h b/target/alpha/cpu.h
>> > index b3e8a823e1..16eb8047cf 100644
>> > --- a/target/alpha/cpu.h
>> > +++ b/target/alpha/cpu.h
>> > @@ -23,8 +23,6 @@
>> >  #include "cpu-qom.h"
>> >  #include "exec/cpu-defs.h"
>> > 
>> > -#define ALIGNED_ONLY
>> > -
>> >  /* Alpha processors have a weak memory model */
>> >  #define TCG_GUEST_DEFAULT_MO      (0)
>> > 
>> > diff --git a/target/hppa/cpu.h b/target/hppa/cpu.h
>> > index aab251bc4b..2be67c289a 100644
>> > --- a/target/hppa/cpu.h
>> > +++ b/target/hppa/cpu.h
>> > @@ -30,7 +30,6 @@
>> >     basis.  It's probably easier to fall back to a strong memory
> model.  */
>> >  #define TCG_GUEST_DEFAULT_MO        TCG_MO_ALL
>> > 
>> > -#define ALIGNED_ONLY
>> >  #define MMU_KERNEL_IDX   0
>> >  #define MMU_USER_IDX     3
>> >  #define MMU_PHYS_IDX     4
>> > diff --git a/target/mips/cpu.h b/target/mips/cpu.h
>> > index 21c0615e02..c13cd4eb31 100644
>> > --- a/target/mips/cpu.h
>> > +++ b/target/mips/cpu.h
>> > @@ -1,8 +1,6 @@
>> >  #ifndef MIPS_CPU_H
>> >  #define MIPS_CPU_H
>> > 
>> > -#define ALIGNED_ONLY
>> > -
>> >  #include "cpu-qom.h"
>> >  #include "exec/cpu-defs.h"
>> >  #include "fpu/softfloat.h"
>> > diff --git a/target/sh4/cpu.h b/target/sh4/cpu.h
>> > index aee733eaaa..ecaa7a18a9 100644
>> > --- a/target/sh4/cpu.h
>> > +++ b/target/sh4/cpu.h
>> > @@ -23,8 +23,6 @@
>> >  #include "cpu-qom.h"
>> >  #include "exec/cpu-defs.h"
>> > 
>> > -#define ALIGNED_ONLY
>> > -
>> >  /* CPU Subtypes */
>> >  #define SH_CPU_SH7750  (1 << 0)
>> >  #define SH_CPU_SH7750S (1 << 1)
>> > diff --git a/target/sparc/cpu.h b/target/sparc/cpu.h
>> > index 8ed2250cd0..1406f0ba2e 100644
>> > --- a/target/sparc/cpu.h
>> > +++ b/target/sparc/cpu.h
>> > @@ -5,8 +5,6 @@
>> >  #include "cpu-qom.h"
>> >  #include "exec/cpu-defs.h"
>> > 
>> > -#define ALIGNED_ONLY
>> > -
>> >  #if !defined(TARGET_SPARC64)
>> >  #define TARGET_DPREGS 16
>> >  #else
>> > diff --git a/target/xtensa/cpu.h b/target/xtensa/cpu.h
>> > index 2c277134f1..0459243e6b 100644
>> > --- a/target/xtensa/cpu.h
>> > +++ b/target/xtensa/cpu.h
>> > @@ -32,8 +32,6 @@
>> >  #include "exec/cpu-defs.h"
>> >  #include "xtensa-isa.h"
>> > 
>> > -#define ALIGNED_ONLY
>> > -
>> >  /* Xtensa processors have a weak memory model */
>> >  #define TCG_GUEST_DEFAULT_MO      (0)
>> > 
>> > diff --git a/tcg/tcg.c b/tcg/tcg.c
>> > index be2c33c400..8d23fb0592 100644
>> > --- a/tcg/tcg.c
>> > +++ b/tcg/tcg.c
>> > @@ -1926,7 +1926,7 @@ static const char * const ldst_name[] =
>> >  };
>> > 
>> >  static const char * const alignment_name[(MO_AMASK >> MO_ASHIFT) +
> 1] = {
>> > -#ifdef ALIGNED_ONLY
>> > +#ifdef TARGET_ALIGNED_ONLY
>> >      [MO_UNALN >> MO_ASHIFT]    = "un+",
>> >      [MO_ALIGN >> MO_ASHIFT]    = "",
>> >  #else
>> > diff --git a/tcg/tcg.h b/tcg/tcg.h
>> > index b411e17a28..529acb2ed8 100644
>> > --- a/tcg/tcg.h
>> > +++ b/tcg/tcg.h
>> > @@ -333,10 +333,12 @@ typedef enum TCGMemOp {
>> >      MO_TE    = MO_LE,
>> >  #endif
>> > 
>> > -    /* MO_UNALN accesses are never checked for alignment.
>> > +    /*
>> > +     * MO_UNALN accesses are never checked for alignment.
>> >       * MO_ALIGN accesses will result in a call to the CPU's
>> >       * do_unaligned_access hook if the guest address is not aligned.
>> > -     * The default depends on whether the target CPU defines
> ALIGNED_ONLY.
>> > +     * The default depends on whether the target CPU defines
>> > +     * TARGET_ALIGNED_ONLY.
>> >       *
>> >       * Some architectures (e.g. ARMv8) need the address which is
> aligned
>> >       * to a size more than the size of the memory access.
>> > @@ -353,7 +355,7 @@ typedef enum TCGMemOp {
>> >       */
>> >      MO_ASHIFT = 4,
>> >      MO_AMASK = 7 << MO_ASHIFT,
>> > -#ifdef ALIGNED_ONLY
>> > +#ifdef TARGET_ALIGNED_ONLY
>> >      MO_ALIGN = 0,
>> >      MO_UNALN = MO_AMASK,
>> >  #else
>> >
>>
>> Queued for 4.2, thanks.
>>
> 
> Paolo, your queueing was premature, just hours after the submission,
> practically not allowing review to happen.
> 
> Please have some time cushion, and especially for the changes that
> affect multiple targets.

It's for 4.2, so there's weeks before the queuing transforms into a pull
request.

Paolo