[PATCH v6] i386/cpu_dump: support AVX512 ZMM regs dump

[PATCH v6] i386/cpu_dump: support AVX512 ZMM regs dump

[Robert Hoo]

Since commit fa4518741e (target-i386: Rename struct XMMReg to ZMMReg),
CPUX86State.xmm_regs[] has already been extended to 512bit to support
AVX512.
Also, other qemu level supports for AVX512 registers are there for
years.
But in x86_cpu_dump_state(), still only dump XMM registers no matter
YMM/ZMM is enabled.
This patch is to complement this, let it dump XMM/YMM/ZMM accordingly.

Signed-off-by: Robert Hoo <robert.hu@linux.intel.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
---
Changelog:
v6: use PRIx64 printf format to satisfy multiple target compiling.
v5: fix a minor issue. rebase to latest master.
v4: stringent AVX512 case and AVX case judgement criteria.
v3: fix some coding style issue.
v2: dump XMM/YMM/ZMM according to XSAVE state-components enablement.

 target/i386/cpu-dump.c | 63 ++++++++++++++++++++++++++++++++++++++------------
 1 file changed, 48 insertions(+), 15 deletions(-)

diff --git a/target/i386/cpu-dump.c b/target/i386/cpu-dump.c
index aac21f1..02b635a 100644
--- a/target/i386/cpu-dump.c
+++ b/target/i386/cpu-dump.c
@@ -478,6 +478,11 @@ void x86_cpu_dump_state(CPUState *cs, FILE *f, int flags)
     qemu_fprintf(f, "EFER=%016" PRIx64 "\n", env->efer);
     if (flags & CPU_DUMP_FPU) {
         int fptag;
+        const uint64_t avx512_mask = XSTATE_OPMASK_MASK | \
+                                     XSTATE_ZMM_Hi256_MASK | \
+                                     XSTATE_Hi16_ZMM_MASK | \
+                                     XSTATE_YMM_MASK | XSTATE_SSE_MASK,
+                       avx_mask = XSTATE_YMM_MASK | XSTATE_SSE_MASK;
         fptag = 0;
         for(i = 0; i < 8; i++) {
             fptag |= ((!env->fptags[i]) << i);
@@ -499,21 +504,49 @@ void x86_cpu_dump_state(CPUState *cs, FILE *f, int flags)
             else
                 qemu_fprintf(f, " ");
         }
-        if (env->hflags & HF_CS64_MASK)
-            nb = 16;
-        else
-            nb = 8;
-        for(i=0;i<nb;i++) {
-            qemu_fprintf(f, "XMM%02d=%08x%08x%08x%08x",
-                         i,
-                         env->xmm_regs[i].ZMM_L(3),
-                         env->xmm_regs[i].ZMM_L(2),
-                         env->xmm_regs[i].ZMM_L(1),
-                         env->xmm_regs[i].ZMM_L(0));
-            if ((i & 1) == 1)
-                qemu_fprintf(f, "\n");
-            else
-                qemu_fprintf(f, " ");
+
+        if ((env->xcr0 & avx512_mask) == avx512_mask) {
+            /* XSAVE enabled AVX512 */
+            for (i = 0; i < NB_OPMASK_REGS; i++) {
+                qemu_fprintf(f, "Opmask%02d=%016"PRIx64"%s", i,
+                             env->opmask_regs[i], ((i & 3) == 3) ? "\n" : " ");
+            }
+
+            nb = (env->hflags & HF_CS64_MASK) ? 32 : 8;
+            for (i = 0; i < nb; i++) {
+                qemu_fprintf(f, "ZMM%02d=%016"PRIx64" %016"PRIx64" %016"PRIx64
+                             " %016"PRIx64" %016"PRIx64" %016"PRIx64
+                             " %016"PRIx64" %016"PRIx64"\n",
+                             i,
+                             env->xmm_regs[i].ZMM_Q(7),
+                             env->xmm_regs[i].ZMM_Q(6),
+                             env->xmm_regs[i].ZMM_Q(5),
+                             env->xmm_regs[i].ZMM_Q(4),
+                             env->xmm_regs[i].ZMM_Q(3),
+                             env->xmm_regs[i].ZMM_Q(2),
+                             env->xmm_regs[i].ZMM_Q(1),
+                             env->xmm_regs[i].ZMM_Q(0));
+            }
+        } else if ((env->xcr0 & avx_mask)  == avx_mask) {
+            /* XSAVE enabled AVX */
+            nb = env->hflags & HF_CS64_MASK ? 16 : 8;
+            for (i = 0; i < nb; i++) {
+                qemu_fprintf(f, "YMM%02d=%016"PRIx64" %016"PRIx64" %016"PRIx64
+                             " %016"PRIx64"\n", i,
+                             env->xmm_regs[i].ZMM_Q(3),
+                             env->xmm_regs[i].ZMM_Q(2),
+                             env->xmm_regs[i].ZMM_Q(1),
+                             env->xmm_regs[i].ZMM_Q(0));
+            }
+        } else { /* SSE and below cases */
+            nb = env->hflags & HF_CS64_MASK ? 16 : 8;
+            for (i = 0; i < nb; i++) {
+                qemu_fprintf(f, "XMM%02d=%016"PRIx64" %016"PRIx64"%s",
+                             i,
+                             env->xmm_regs[i].ZMM_Q(1),
+                             env->xmm_regs[i].ZMM_Q(0),
+                             (i & 1) ? "\n" : " ");
+            }
         }
     }
     if (flags & CPU_DUMP_CODE) {
-- 
1.8.3.1

Re: [PATCH v6] i386/cpu_dump: support AVX512 ZMM regs dump

[Eduardo Habkost]

On Wed, Apr 21, 2021 at 02:23:52PM +0800, Robert Hoo wrote:
> Since commit fa4518741e (target-i386: Rename struct XMMReg to ZMMReg),
> CPUX86State.xmm_regs[] has already been extended to 512bit to support
> AVX512.
> Also, other qemu level supports for AVX512 registers are there for
> years.
> But in x86_cpu_dump_state(), still only dump XMM registers no matter
> YMM/ZMM is enabled.
> This patch is to complement this, let it dump XMM/YMM/ZMM accordingly.
> 
> Signed-off-by: Robert Hoo <robert.hu@linux.intel.com>
> Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

Queued, thanks!

-- 
Eduardo