Re: [PATCH v2 10/23] target/i386: Prefer fast cpu_env() over slower CPU QOM cast macro

[Zhao Liu]

Hi Philippe,

On Fri, Jan 26, 2024 at 11:03:52PM +0100, Philippe Mathieu-Daudé wrote:
> Date: Fri, 26 Jan 2024 23:03:52 +0100
> From: Philippe Mathieu-Daudé <philmd@linaro.org>
> Subject: [PATCH v2 10/23] target/i386: Prefer fast cpu_env() over slower
>  CPU QOM cast macro
> X-Mailer: git-send-email 2.41.0
> 
> Mechanical patch produced running the command documented
> in scripts/coccinelle/cpu_env.cocci_template header.
> 
> Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
> ---
>  target/i386/hvf/vmx.h               | 13 +++-------
>  hw/i386/vmmouse.c                   |  6 ++---
>  hw/i386/xen/xen-hvm.c               |  3 +--
>  target/i386/arch_memory_mapping.c   |  3 +--
>  target/i386/cpu-dump.c              |  3 +--
>  target/i386/cpu.c                   | 37 +++++++++------------------
>  target/i386/helper.c                | 39 ++++++++---------------------
>  target/i386/hvf/hvf.c               |  8 ++----
>  target/i386/hvf/x86.c               |  4 +--
>  target/i386/hvf/x86_emu.c           |  6 ++---
>  target/i386/hvf/x86_task.c          | 10 +++-----
>  target/i386/hvf/x86hvf.c            |  6 ++---
>  target/i386/kvm/kvm.c               |  6 ++---
>  target/i386/kvm/xen-emu.c           | 32 ++++++++---------------
>  target/i386/tcg/sysemu/bpt_helper.c |  3 +--
>  target/i386/tcg/tcg-cpu.c           | 14 +++--------
>  target/i386/tcg/user/excp_helper.c  |  3 +--
>  target/i386/tcg/user/seg_helper.c   |  3 +--
>  18 files changed, 59 insertions(+), 140 deletions(-)
> 

[snip]

> diff --git a/target/i386/hvf/x86hvf.c b/target/i386/hvf/x86hvf.c
> index 3b1ef5f49a..1e7fd587fe 100644
> --- a/target/i386/hvf/x86hvf.c
> +++ b/target/i386/hvf/x86hvf.c
> @@ -238,8 +238,7 @@ void hvf_get_msrs(CPUState *cs)
>  
>  int hvf_put_registers(CPUState *cs)
>  {
> -    X86CPU *x86cpu = X86_CPU(cs);
> -    CPUX86State *env = &x86cpu->env;
> +    CPUX86State *env = cpu_env(cs);
>  
>      wreg(cs->accel->fd, HV_X86_RAX, env->regs[R_EAX]);
>      wreg(cs->accel->fd, HV_X86_RBX, env->regs[R_EBX]);
> @@ -282,8 +281,7 @@ int hvf_put_registers(CPUState *cs)
>  
>  int hvf_get_registers(CPUState *cs)
>  {
> -    X86CPU *x86cpu = X86_CPU(cs);
> -    CPUX86State *env = &x86cpu->env;
> +    CPUX86State *env = cpu_env(cs);
>  
>      env->regs[R_EAX] = rreg(cs->accel->fd, HV_X86_RAX);
>      env->regs[R_EBX] = rreg(cs->accel->fd, HV_X86_RBX);

In this file, there's another corner case:

diff --git a/target/i386/hvf/x86hvf.c b/target/i386/hvf/x86hvf.c
index 3b1ef5f49a8a..9a145aa5aa4f 100644
--- a/target/i386/hvf/x86hvf.c
+++ b/target/i386/hvf/x86hvf.c
@@ -342,8 +342,7 @@ void vmx_clear_int_window_exiting(CPUState *cs)

 bool hvf_inject_interrupts(CPUState *cs)
 {
-    X86CPU *x86cpu = X86_CPU(cs);
-    CPUX86State *env = &x86cpu->env;
+    CPUX86State *env = cpu_env(cs);

     uint8_t vector;
     uint64_t intr_type;
@@ -408,7 +407,7 @@ bool hvf_inject_interrupts(CPUState *cs)
     if (!(env->hflags & HF_INHIBIT_IRQ_MASK) &&
         (cs->interrupt_request & CPU_INTERRUPT_HARD) &&
         (env->eflags & IF_MASK) && !(info & VMCS_INTR_VALID)) {
-        int line = cpu_get_pic_interrupt(&x86cpu->env);
+        int line = cpu_get_pic_interrupt(env);
         cs->interrupt_request &= ~CPU_INTERRUPT_HARD;
         if (line >= 0) {
             wvmcs(cs->accel->fd, VMCS_ENTRY_INTR_INFO, line |


For this special case, I'm not sure if the script can cover it as well,
otherwise maybe it's OK to be cleaned up manually ;-).

> diff --git a/target/i386/tcg/user/excp_helper.c 
> b/target/i386/tcg/user/excp_helper.c
> index b3bdb7831a..bfcae9f39e 100644
> --- a/target/i386/tcg/user/excp_helper.c
> +++ b/target/i386/tcg/user/excp_helper.c
> @@ -26,8 +26,7 @@ void x86_cpu_record_sigsegv(CPUState *cs, vaddr addr,
>                              MMUAccessType access_type,
>                              bool maperr, uintptr_t ra)
>  {
> -    X86CPU *cpu = X86_CPU(cs);
> -    CPUX86State *env = &cpu->env;
> +    CPUX86State *env = cpu_env(cs);
>  
>      /*
>       * The error_code that hw reports as part of the exception frame

In this file, there's another case:

diff --git a/target/i386/tcg/user/excp_helper.c 
b/target/i386/tcg/user/excp_helper.c
index b3bdb7831a7a..02fcd64fc080 100644
--- a/target/i386/tcg/user/excp_helper.c
+++ b/target/i386/tcg/user/excp_helper.c
@@ -52,6 +52,5 @@ void x86_cpu_record_sigsegv(CPUState *cs, vaddr addr,
 void x86_cpu_record_sigbus(CPUState *cs, vaddr addr,
                            MMUAccessType access_type, uintptr_t ra)
 {
-    X86CPU *cpu = X86_CPU(cs);
-    handle_unaligned_access(&cpu->env, addr, access_type, ra);
+    handle_unaligned_access(cpu_env(cs), addr, access_type, ra);
 }

[snip]

LGTM.
Reviewed-by: Zhao Liu <zhao1.liu@intel.com>