target-i386: fix set of registers zeroed on reset

BND0-3, BNDCFGU, BNDCFGS, BNDSTATUS were not zeroed on reset, but they
should be (Intel Instruction Set Extensions Programming Reference
319433-015, pages 9-4 and 9-6).  Same for YMM.

XCR0 should be reset to 1.

TSC and TSC_RESET were zeroed already by the memset, remove the explicit
assignments.

Cc: Andreas Faerber <afaerber@suse.de>
Reviewed-by: NMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

target-i386/cpu.c

@@ -2485,8 +2485,7 @@ static void x86_cpu_reset(CPUState *s)
     cpu_breakpoint_remove_all(s, BP_CPU);
     cpu_watchpoint_remove_all(s, BP_CPU);
 
-    env->tsc_adjust = 0;
-    env->tsc = 0;
+    env->xcr0 = 1;
 
 #if !defined(CONFIG_USER_ONLY)
     /* We hard-wire the BSP to the first CPU. */

target-i386/cpu.h

@@ -797,6 +797,10 @@ typedef struct CPUX86State {
     target_ulong cr[5]; /* NOTE: cr1 is unused */
     int32_t a20_mask;
 
+    BNDReg bnd_regs[4];
+    BNDCSReg bndcs_regs;
+    uint64_t msr_bndcfgs;
+
     /* FPU state */
     unsigned int fpstt; /* top of stack index */
     uint16_t fpus;
@@ -819,6 +823,8 @@ typedef struct CPUX86State {
     XMMReg xmm_t0;
     MMXReg mmx_t0;
 
+    XMMReg ymmh_regs[CPU_NB_REGS];
+
     /* sysenter registers */
     uint32_t sysenter_cs;
     target_ulong sysenter_esp;
@@ -928,12 +934,7 @@ typedef struct CPUX86State {
     uint16_t fpus_vmstate;
     uint16_t fptag_vmstate;
     uint16_t fpregs_format_vmstate;
-
     uint64_t xstate_bv;
-    XMMReg ymmh_regs[CPU_NB_REGS];
-    BNDReg bnd_regs[4];
-    BNDCSReg bndcs_regs;
-    uint64_t msr_bndcfgs;
 
     uint64_t xcr0;