KVM: PPC: elide struct thread_struct instances from stack

Instead of instantiating a whole thread_struct on the stack use only the
required parts of it.

Signed-off-by: Andreas Schwab <schwab@linux-m68k.org>
Tested-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

diff --git a/arch/powerpc/include/asm/kvm_fpu.h b/arch/powerpc/include/asm/kvm_fpu.h
index 94f05de9ad04dd3f60498f034a1cbcf043cb2abe..c3d4f0518a67c2f89b4c42e3d1b81e20dea0c059 100644 (file)
--- a/arch/powerpc/include/asm/kvm_fpu.h
+++ b/arch/powerpc/include/asm/kvm_fpu.h
@@ -22,24 +22,24 @@
 
 #include <linux/types.h>
 
-extern void fps_fres(struct thread_struct *t, u32 *dst, u32 *src1);
-extern void fps_frsqrte(struct thread_struct *t, u32 *dst, u32 *src1);
-extern void fps_fsqrts(struct thread_struct *t, u32 *dst, u32 *src1);
+extern void fps_fres(u64 *fpscr, u32 *dst, u32 *src1);
+extern void fps_frsqrte(u64 *fpscr, u32 *dst, u32 *src1);
+extern void fps_fsqrts(u64 *fpscr, u32 *dst, u32 *src1);
 
-extern void fps_fadds(struct thread_struct *t, u32 *dst, u32 *src1, u32 *src2);
-extern void fps_fdivs(struct thread_struct *t, u32 *dst, u32 *src1, u32 *src2);
-extern void fps_fmuls(struct thread_struct *t, u32 *dst, u32 *src1, u32 *src2);
-extern void fps_fsubs(struct thread_struct *t, u32 *dst, u32 *src1, u32 *src2);
+extern void fps_fadds(u64 *fpscr, u32 *dst, u32 *src1, u32 *src2);
+extern void fps_fdivs(u64 *fpscr, u32 *dst, u32 *src1, u32 *src2);
+extern void fps_fmuls(u64 *fpscr, u32 *dst, u32 *src1, u32 *src2);
+extern void fps_fsubs(u64 *fpscr, u32 *dst, u32 *src1, u32 *src2);
 
-extern void fps_fmadds(struct thread_struct *t, u32 *dst, u32 *src1, u32 *src2,
+extern void fps_fmadds(u64 *fpscr, u32 *dst, u32 *src1, u32 *src2,
                       u32 *src3);
-extern void fps_fmsubs(struct thread_struct *t, u32 *dst, u32 *src1, u32 *src2,
+extern void fps_fmsubs(u64 *fpscr, u32 *dst, u32 *src1, u32 *src2,
                       u32 *src3);
-extern void fps_fnmadds(struct thread_struct *t, u32 *dst, u32 *src1, u32 *src2,
+extern void fps_fnmadds(u64 *fpscr, u32 *dst, u32 *src1, u32 *src2,
                        u32 *src3);
-extern void fps_fnmsubs(struct thread_struct *t, u32 *dst, u32 *src1, u32 *src2,
+extern void fps_fnmsubs(u64 *fpscr, u32 *dst, u32 *src1, u32 *src2,
                        u32 *src3);
-extern void fps_fsel(struct thread_struct *t, u32 *dst, u32 *src1, u32 *src2,
+extern void fps_fsel(u64 *fpscr, u32 *dst, u32 *src1, u32 *src2,
                     u32 *src3);
 
 #define FPD_ONE_IN(name) extern void fpd_ ## name(u64 *fpscr, u32 *cr, \
@@ -82,4 +82,7 @@ FPD_THREE_IN(fmadd)
 FPD_THREE_IN(fnmsub)
 FPD_THREE_IN(fnmadd)
 
+extern void kvm_cvt_fd(u32 *from, u64 *to, u64 *fpscr);
+extern void kvm_cvt_df(u64 *from, u32 *to, u64 *fpscr);
+
 #endif

diff --git a/arch/powerpc/kernel/ppc_ksyms.c b/arch/powerpc/kernel/ppc_ksyms.c
index 3b4dcc82a4c1f43ab1f26a29506591e0d4aa4369..ab3e392ac63c41fda474ce4857660bbd38e459bd 100644 (file)
--- a/arch/powerpc/kernel/ppc_ksyms.c
+++ b/arch/powerpc/kernel/ppc_ksyms.c
@@ -101,10 +101,6 @@ EXPORT_SYMBOL(pci_dram_offset);
 EXPORT_SYMBOL(start_thread);
 EXPORT_SYMBOL(kernel_thread);
 
-#ifdef CONFIG_PPC_FPU
-EXPORT_SYMBOL_GPL(cvt_df);
-EXPORT_SYMBOL_GPL(cvt_fd);
-#endif
 EXPORT_SYMBOL(giveup_fpu);
 #ifdef CONFIG_ALTIVEC
 EXPORT_SYMBOL(giveup_altivec);

diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
index f6eac2f337d9b080a1d13f15dc88a7f69aba039c..801d9f3c70aec7ab9d3dd057f882d5b632695c2d 100644 (file)
--- a/arch/powerpc/kvm/book3s.c
+++ b/arch/powerpc/kvm/book3s.c
@@ -1293,12 +1293,17 @@ extern int __kvmppc_vcpu_entry(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu);
 int __kvmppc_vcpu_run(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
 {
        int ret;
-       struct thread_struct ext_bkp;
+       double fpr[32][TS_FPRWIDTH];
+       unsigned int fpscr;
+       int fpexc_mode;
 #ifdef CONFIG_ALTIVEC
-       bool save_vec = current->thread.used_vr;
+       vector128 vr[32];
+       vector128 vscr;
+       unsigned long uninitialized_var(vrsave);
+       int used_vr;
 #endif
 #ifdef CONFIG_VSX
-       bool save_vsx = current->thread.used_vsr;
+       int used_vsr;
 #endif
        ulong ext_msr;
 
@@ -1311,27 +1316,27 @@ int __kvmppc_vcpu_run(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
        /* Save FPU state in stack */
        if (current->thread.regs->msr & MSR_FP)
                giveup_fpu(current);
-       memcpy(ext_bkp.fpr, current->thread.fpr, sizeof(current->thread.fpr));
-       ext_bkp.fpscr = current->thread.fpscr;
-       ext_bkp.fpexc_mode = current->thread.fpexc_mode;
+       memcpy(fpr, current->thread.fpr, sizeof(current->thread.fpr));
+       fpscr = current->thread.fpscr.val;
+       fpexc_mode = current->thread.fpexc_mode;
 
 #ifdef CONFIG_ALTIVEC
        /* Save Altivec state in stack */
-       if (save_vec) {
+       used_vr = current->thread.used_vr;
+       if (used_vr) {
                if (current->thread.regs->msr & MSR_VEC)
                        giveup_altivec(current);
-               memcpy(ext_bkp.vr, current->thread.vr, sizeof(ext_bkp.vr));
-               ext_bkp.vscr = current->thread.vscr;
-               ext_bkp.vrsave = current->thread.vrsave;
+               memcpy(vr, current->thread.vr, sizeof(current->thread.vr));
+               vscr = current->thread.vscr;
+               vrsave = current->thread.vrsave;
        }
-       ext_bkp.used_vr = current->thread.used_vr;
 #endif
 
 #ifdef CONFIG_VSX
        /* Save VSX state in stack */
-       if (save_vsx && (current->thread.regs->msr & MSR_VSX))
+       used_vsr = current->thread.used_vsr;
+       if (used_vsr && (current->thread.regs->msr & MSR_VSX))
                        __giveup_vsx(current);
-       ext_bkp.used_vsr = current->thread.used_vsr;
 #endif
 
        /* Remember the MSR with disabled extensions */
@@ -1356,22 +1361,22 @@ int __kvmppc_vcpu_run(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
        kvmppc_giveup_ext(vcpu, MSR_VSX);
 
        /* Restore FPU state from stack */
-       memcpy(current->thread.fpr, ext_bkp.fpr, sizeof(ext_bkp.fpr));
-       current->thread.fpscr = ext_bkp.fpscr;
-       current->thread.fpexc_mode = ext_bkp.fpexc_mode;
+       memcpy(current->thread.fpr, fpr, sizeof(current->thread.fpr));
+       current->thread.fpscr.val = fpscr;
+       current->thread.fpexc_mode = fpexc_mode;
 
 #ifdef CONFIG_ALTIVEC
        /* Restore Altivec state from stack */
-       if (save_vec && current->thread.used_vr) {
-               memcpy(current->thread.vr, ext_bkp.vr, sizeof(ext_bkp.vr));
-               current->thread.vscr = ext_bkp.vscr;
-               current->thread.vrsave= ext_bkp.vrsave;
+       if (used_vr && current->thread.used_vr) {
+               memcpy(current->thread.vr, vr, sizeof(current->thread.vr));
+               current->thread.vscr = vscr;
+               current->thread.vrsave = vrsave;
        }
-       current->thread.used_vr = ext_bkp.used_vr;
+       current->thread.used_vr = used_vr;
 #endif
 
 #ifdef CONFIG_VSX
-       current->thread.used_vsr = ext_bkp.used_vsr;
+       current->thread.used_vsr = used_vsr;
 #endif
 
        return ret;

diff --git a/arch/powerpc/kvm/book3s_paired_singles.c b/arch/powerpc/kvm/book3s_paired_singles.c
index a9f66abafcb3e3a1a510b44b5f47fabeae886ee6..474f2e24050a03a3d89ca85a7b34993d687a61f3 100644 (file)
--- a/arch/powerpc/kvm/book3s_paired_singles.c
+++ b/arch/powerpc/kvm/book3s_paired_singles.c
@@ -159,10 +159,7 @@
 
 static inline void kvmppc_sync_qpr(struct kvm_vcpu *vcpu, int rt)
 {
-       struct thread_struct t;
-
-       t.fpscr.val = vcpu->arch.fpscr;
-       cvt_df((double*)&vcpu->arch.fpr[rt], (float*)&vcpu->arch.qpr[rt], &t);
+       kvm_cvt_df(&vcpu->arch.fpr[rt], &vcpu->arch.qpr[rt], &vcpu->arch.fpscr);
 }
 
 static void kvmppc_inject_pf(struct kvm_vcpu *vcpu, ulong eaddr, bool is_store)
@@ -183,7 +180,6 @@ static int kvmppc_emulate_fpr_load(struct kvm_run *run, struct kvm_vcpu *vcpu,
                                   int rs, ulong addr, int ls_type)
 {
        int emulated = EMULATE_FAIL;
-       struct thread_struct t;
        int r;
        char tmp[8];
        int len = sizeof(u32);
@@ -191,8 +187,6 @@ static int kvmppc_emulate_fpr_load(struct kvm_run *run, struct kvm_vcpu *vcpu,
        if (ls_type == FPU_LS_DOUBLE)
                len = sizeof(u64);
 
-       t.fpscr.val = vcpu->arch.fpscr;
-
        /* read from memory */
        r = kvmppc_ld(vcpu, &addr, len, tmp, true);
        vcpu->arch.paddr_accessed = addr;
@@ -210,7 +204,7 @@ static int kvmppc_emulate_fpr_load(struct kvm_run *run, struct kvm_vcpu *vcpu,
        /* put in registers */
        switch (ls_type) {
        case FPU_LS_SINGLE:
-               cvt_fd((float*)tmp, (double*)&vcpu->arch.fpr[rs], &t);
+               kvm_cvt_fd((u32*)tmp, &vcpu->arch.fpr[rs], &vcpu->arch.fpscr);
                vcpu->arch.qpr[rs] = *((u32*)tmp);
                break;
        case FPU_LS_DOUBLE:
@@ -229,17 +223,14 @@ static int kvmppc_emulate_fpr_store(struct kvm_run *run, struct kvm_vcpu *vcpu,
                                    int rs, ulong addr, int ls_type)
 {
        int emulated = EMULATE_FAIL;
-       struct thread_struct t;
        int r;
        char tmp[8];
        u64 val;
        int len;
 
-       t.fpscr.val = vcpu->arch.fpscr;
-
        switch (ls_type) {
        case FPU_LS_SINGLE:
-               cvt_df((double*)&vcpu->arch.fpr[rs], (float*)tmp, &t);
+               kvm_cvt_df(&vcpu->arch.fpr[rs], (u32*)tmp, &vcpu->arch.fpscr);
                val = *((u32*)tmp);
                len = sizeof(u32);
                break;
@@ -278,13 +269,10 @@ static int kvmppc_emulate_psq_load(struct kvm_run *run, struct kvm_vcpu *vcpu,
                                   int rs, ulong addr, bool w, int i)
 {
        int emulated = EMULATE_FAIL;
-       struct thread_struct t;
        int r;
        float one = 1.0;
        u32 tmp[2];
 
-       t.fpscr.val = vcpu->arch.fpscr;
-
        /* read from memory */
        if (w) {
                r = kvmppc_ld(vcpu, &addr, sizeof(u32), tmp, true);
@@ -308,7 +296,7 @@ static int kvmppc_emulate_psq_load(struct kvm_run *run, struct kvm_vcpu *vcpu,
        emulated = EMULATE_DONE;
 
        /* put in registers */
-       cvt_fd((float*)&tmp[0], (double*)&vcpu->arch.fpr[rs], &t);
+       kvm_cvt_fd(&tmp[0], &vcpu->arch.fpr[rs], &vcpu->arch.fpscr);
        vcpu->arch.qpr[rs] = tmp[1];
 
        dprintk(KERN_INFO "KVM: PSQ_LD [0x%x, 0x%x] at 0x%lx (%d)\n", tmp[0],
@@ -322,14 +310,11 @@ static int kvmppc_emulate_psq_store(struct kvm_run *run, struct kvm_vcpu *vcpu,
                                    int rs, ulong addr, bool w, int i)
 {
        int emulated = EMULATE_FAIL;
-       struct thread_struct t;
        int r;
        u32 tmp[2];
        int len = w ? sizeof(u32) : sizeof(u64);
 
-       t.fpscr.val = vcpu->arch.fpscr;
-
-       cvt_df((double*)&vcpu->arch.fpr[rs], (float*)&tmp[0], &t);
+       kvm_cvt_df(&vcpu->arch.fpr[rs], &tmp[0], &vcpu->arch.fpscr);
        tmp[1] = vcpu->arch.qpr[rs];
 
        r = kvmppc_st(vcpu, &addr, len, tmp, true);
@@ -517,7 +502,7 @@ static int get_d_signext(u32 inst)
 static int kvmppc_ps_three_in(struct kvm_vcpu *vcpu, bool rc,
                                      int reg_out, int reg_in1, int reg_in2,
                                      int reg_in3, int scalar,
-                                     void (*func)(struct thread_struct *t,
+                                     void (*func)(u64 *fpscr,
                                                 u32 *dst, u32 *src1,
                                                 u32 *src2, u32 *src3))
 {
@@ -526,27 +511,25 @@ static int kvmppc_ps_three_in(struct kvm_vcpu *vcpu, bool rc,
        u32 ps0_out;
        u32 ps0_in1, ps0_in2, ps0_in3;
        u32 ps1_in1, ps1_in2, ps1_in3;
-       struct thread_struct t;
-       t.fpscr.val = vcpu->arch.fpscr;
 
        /* RC */
        WARN_ON(rc);
 
        /* PS0 */
-       cvt_df((double*)&fpr[reg_in1], (float*)&ps0_in1, &t);
-       cvt_df((double*)&fpr[reg_in2], (float*)&ps0_in2, &t);
-       cvt_df((double*)&fpr[reg_in3], (float*)&ps0_in3, &t);
+       kvm_cvt_df(&fpr[reg_in1], &ps0_in1, &vcpu->arch.fpscr);
+       kvm_cvt_df(&fpr[reg_in2], &ps0_in2, &vcpu->arch.fpscr);
+       kvm_cvt_df(&fpr[reg_in3], &ps0_in3, &vcpu->arch.fpscr);
 
        if (scalar & SCALAR_LOW)
                ps0_in2 = qpr[reg_in2];
 
-       func(&t, &ps0_out, &ps0_in1, &ps0_in2, &ps0_in3);
+       func(&vcpu->arch.fpscr, &ps0_out, &ps0_in1, &ps0_in2, &ps0_in3);
 
        dprintk(KERN_INFO "PS3 ps0 -> f(0x%x, 0x%x, 0x%x) = 0x%x\n",
                          ps0_in1, ps0_in2, ps0_in3, ps0_out);
 
        if (!(scalar & SCALAR_NO_PS0))
-               cvt_fd((float*)&ps0_out, (double*)&fpr[reg_out], &t);
+               kvm_cvt_fd(&ps0_out, &fpr[reg_out], &vcpu->arch.fpscr);
 
        /* PS1 */
        ps1_in1 = qpr[reg_in1];
@@ -557,7 +540,7 @@ static int kvmppc_ps_three_in(struct kvm_vcpu *vcpu, bool rc,
                ps1_in2 = ps0_in2;
 
        if (!(scalar & SCALAR_NO_PS1))
-               func(&t, &qpr[reg_out], &ps1_in1, &ps1_in2, &ps1_in3);
+               func(&vcpu->arch.fpscr, &qpr[reg_out], &ps1_in1, &ps1_in2, &ps1_in3);
 
        dprintk(KERN_INFO "PS3 ps1 -> f(0x%x, 0x%x, 0x%x) = 0x%x\n",
                          ps1_in1, ps1_in2, ps1_in3, qpr[reg_out]);
@@ -568,7 +551,7 @@ static int kvmppc_ps_three_in(struct kvm_vcpu *vcpu, bool rc,
 static int kvmppc_ps_two_in(struct kvm_vcpu *vcpu, bool rc,
                                    int reg_out, int reg_in1, int reg_in2,
                                    int scalar,
-                                   void (*func)(struct thread_struct *t,
+                                   void (*func)(u64 *fpscr,
                                                 u32 *dst, u32 *src1,
                                                 u32 *src2))
 {
@@ -578,27 +561,25 @@ static int kvmppc_ps_two_in(struct kvm_vcpu *vcpu, bool rc,
        u32 ps0_in1, ps0_in2;
        u32 ps1_out;
        u32 ps1_in1, ps1_in2;
-       struct thread_struct t;
-       t.fpscr.val = vcpu->arch.fpscr;
 
        /* RC */
        WARN_ON(rc);
 
        /* PS0 */
-       cvt_df((double*)&fpr[reg_in1], (float*)&ps0_in1, &t);
+       kvm_cvt_df(&fpr[reg_in1], &ps0_in1, &vcpu->arch.fpscr);
 
        if (scalar & SCALAR_LOW)
                ps0_in2 = qpr[reg_in2];
        else
-               cvt_df((double*)&fpr[reg_in2], (float*)&ps0_in2, &t);
+               kvm_cvt_df(&fpr[reg_in2], &ps0_in2, &vcpu->arch.fpscr);
 
-       func(&t, &ps0_out, &ps0_in1, &ps0_in2);
+       func(&vcpu->arch.fpscr, &ps0_out, &ps0_in1, &ps0_in2);
 
        if (!(scalar & SCALAR_NO_PS0)) {
                dprintk(KERN_INFO "PS2 ps0 -> f(0x%x, 0x%x) = 0x%x\n",
                                  ps0_in1, ps0_in2, ps0_out);
 
-               cvt_fd((float*)&ps0_out, (double*)&fpr[reg_out], &t);
+               kvm_cvt_fd(&ps0_out, &fpr[reg_out], &vcpu->arch.fpscr);
        }
 
        /* PS1 */
@@ -608,7 +589,7 @@ static int kvmppc_ps_two_in(struct kvm_vcpu *vcpu, bool rc,
        if (scalar & SCALAR_HIGH)
                ps1_in2 = ps0_in2;
 
-       func(&t, &ps1_out, &ps1_in1, &ps1_in2);
+       func(&vcpu->arch.fpscr, &ps1_out, &ps1_in1, &ps1_in2);
 
        if (!(scalar & SCALAR_NO_PS1)) {
                qpr[reg_out] = ps1_out;
@@ -622,31 +603,29 @@ static int kvmppc_ps_two_in(struct kvm_vcpu *vcpu, bool rc,
 
 static int kvmppc_ps_one_in(struct kvm_vcpu *vcpu, bool rc,
                                    int reg_out, int reg_in,
-                                   void (*func)(struct thread_struct *t,
+                                   void (*func)(u64 *t,
                                                 u32 *dst, u32 *src1))
 {
        u32 *qpr = vcpu->arch.qpr;
        u64 *fpr = vcpu->arch.fpr;
        u32 ps0_out, ps0_in;
        u32 ps1_in;
-       struct thread_struct t;
-       t.fpscr.val = vcpu->arch.fpscr;
 
        /* RC */
        WARN_ON(rc);
 
        /* PS0 */
-       cvt_df((double*)&fpr[reg_in], (float*)&ps0_in, &t);
-       func(&t, &ps0_out, &ps0_in);
+       kvm_cvt_df(&fpr[reg_in], &ps0_in, &vcpu->arch.fpscr);
+       func(&vcpu->arch.fpscr, &ps0_out, &ps0_in);
 
        dprintk(KERN_INFO "PS1 ps0 -> f(0x%x) = 0x%x\n",
                          ps0_in, ps0_out);
 
-       cvt_fd((float*)&ps0_out, (double*)&fpr[reg_out], &t);
+       kvm_cvt_fd(&ps0_out, &fpr[reg_out], &vcpu->arch.fpscr);
 
        /* PS1 */
        ps1_in = qpr[reg_in];
-       func(&t, &qpr[reg_out], &ps1_in);
+       func(&vcpu->arch.fpscr, &qpr[reg_out], &ps1_in);
 
        dprintk(KERN_INFO "PS1 ps1 -> f(0x%x) = 0x%x\n",
                          ps1_in, qpr[reg_out]);
@@ -672,13 +651,10 @@ int kvmppc_emulate_paired_single(struct kvm_run *run, struct kvm_vcpu *vcpu)
 
        bool rcomp = (inst & 1) ? true : false;
        u32 cr = kvmppc_get_cr(vcpu);
-       struct thread_struct t;
 #ifdef DEBUG
        int i;
 #endif
 
-       t.fpscr.val = vcpu->arch.fpscr;
-
        if (!kvmppc_inst_is_paired_single(vcpu, inst))
                return EMULATE_FAIL;
 
@@ -695,7 +671,7 @@ int kvmppc_emulate_paired_single(struct kvm_run *run, struct kvm_vcpu *vcpu)
 #ifdef DEBUG
        for (i = 0; i < ARRAY_SIZE(vcpu->arch.fpr); i++) {
                u32 f;
-               cvt_df((double*)&vcpu->arch.fpr[i], (float*)&f, &t);
+               kvm_cvt_df(&vcpu->arch.fpr[i], &f, &vcpu->arch.fpscr);
                dprintk(KERN_INFO "FPR[%d] = 0x%x / 0x%llx    QPR[%d] = 0x%x\n",
                        i, f, vcpu->arch.fpr[i], i, vcpu->arch.qpr[i]);
        }
@@ -819,8 +795,9 @@ int kvmppc_emulate_paired_single(struct kvm_run *run, struct kvm_vcpu *vcpu)
                        WARN_ON(rcomp);
                        vcpu->arch.fpr[ax_rd] = vcpu->arch.fpr[ax_ra];
                        /* vcpu->arch.qpr[ax_rd] = vcpu->arch.fpr[ax_rb]; */
-                       cvt_df((double*)&vcpu->arch.fpr[ax_rb],
-                              (float*)&vcpu->arch.qpr[ax_rd], &t);
+                       kvm_cvt_df(&vcpu->arch.fpr[ax_rb],
+                                  &vcpu->arch.qpr[ax_rd],
+                                  &vcpu->arch.fpscr);
                        break;
                case OP_4X_PS_MERGE01:
                        WARN_ON(rcomp);
@@ -830,17 +807,20 @@ int kvmppc_emulate_paired_single(struct kvm_run *run, struct kvm_vcpu *vcpu)
                case OP_4X_PS_MERGE10:
                        WARN_ON(rcomp);
                        /* vcpu->arch.fpr[ax_rd] = vcpu->arch.qpr[ax_ra]; */
-                       cvt_fd((float*)&vcpu->arch.qpr[ax_ra],
-                              (double*)&vcpu->arch.fpr[ax_rd], &t);
+                       kvm_cvt_fd(&vcpu->arch.qpr[ax_ra],
+                                  &vcpu->arch.fpr[ax_rd],
+                                  &vcpu->arch.fpscr);
                        /* vcpu->arch.qpr[ax_rd] = vcpu->arch.fpr[ax_rb]; */
-                       cvt_df((double*)&vcpu->arch.fpr[ax_rb],
-                              (float*)&vcpu->arch.qpr[ax_rd], &t);
+                       kvm_cvt_df(&vcpu->arch.fpr[ax_rb],
+                                  &vcpu->arch.qpr[ax_rd],
+                                  &vcpu->arch.fpscr);
                        break;
                case OP_4X_PS_MERGE11:
                        WARN_ON(rcomp);
                        /* vcpu->arch.fpr[ax_rd] = vcpu->arch.qpr[ax_ra]; */
-                       cvt_fd((float*)&vcpu->arch.qpr[ax_ra],
-                              (double*)&vcpu->arch.fpr[ax_rd], &t);
+                       kvm_cvt_fd(&vcpu->arch.qpr[ax_ra],
+                                  &vcpu->arch.fpr[ax_rd],
+                                  &vcpu->arch.fpscr);
                        vcpu->arch.qpr[ax_rd] = vcpu->arch.qpr[ax_rb];
                        break;
                }
@@ -1275,7 +1255,7 @@ int kvmppc_emulate_paired_single(struct kvm_run *run, struct kvm_vcpu *vcpu)
 #ifdef DEBUG
        for (i = 0; i < ARRAY_SIZE(vcpu->arch.fpr); i++) {
                u32 f;
-               cvt_df((double*)&vcpu->arch.fpr[i], (float*)&f, &t);
+               kvm_cvt_df(&vcpu->arch.fpr[i], &f, &vcpu->arch.fpscr);
                dprintk(KERN_INFO "FPR[%d] = 0x%x\n", i, f);
        }
 #endif

diff --git a/arch/powerpc/kvm/fpu.S b/arch/powerpc/kvm/fpu.S
index 2b340a3eee903d5b2a26ab7c80746235f4f7397b..cb34bbe1611365c4761ebd1d20c58e8f2997ae12 100644 (file)
--- a/arch/powerpc/kvm/fpu.S
+++ b/arch/powerpc/kvm/fpu.S
@@ -271,3 +271,21 @@ FPD_THREE_IN(fmsub)
 FPD_THREE_IN(fmadd)
 FPD_THREE_IN(fnmsub)
 FPD_THREE_IN(fnmadd)
+
+_GLOBAL(kvm_cvt_fd)
+       lfd     0,0(r5)                 /* load up fpscr value */
+       MTFSF_L(0)
+       lfs     0,0(r3)
+       stfd    0,0(r4)
+       mffs    0
+       stfd    0,0(r5)                 /* save new fpscr value */
+       blr
+
+_GLOBAL(kvm_cvt_df)
+       lfd     0,0(r5)                 /* load up fpscr value */
+       MTFSF_L(0)
+       lfd     0,0(r3)
+       stfs    0,0(r4)
+       mffs    0
+       stfd    0,0(r5)                 /* save new fpscr value */
+       blr