Commit 85ad6230 authored by Jason J. Herne's avatar Jason J. Herne Committed by Cornelia Huck
Browse files

s390x/kvm: synchronize guest floating point registers 



Add code to kvm_arch_get_registers and kvm_arch_put_registers to
save/restore floating point registers. This missing sync was
unnoticed until migration of userspace that uses fprs.

Signed-off-by: default avatarJason J. Herne <jjherne@us.ibm.com>
Signed-off-by: default avatarChristian Borntraeger <borntraeger@de.ibm.com>
[Update patch to latest upstream]
Cc: qemu-stable@nongnu.org
Reviewed-by: default avatarAlexander Graf <agraf@suse.de>
Signed-off-by: default avatarCornelia Huck <cornelia.huck@de.ibm.com>
parent ab6d3749

target-s390x/kvm.c

+23 −0
Original line number Diff line number Diff line
@@ -207,6 +207,7 @@ int kvm_arch_put_registers(CPUState *cs, int level) 
    CPUS390XState *env = &cpu->env;

    struct kvm_sregs sregs;

    struct kvm_regs regs;

    struct kvm_fpu fpu;

    int r;

    int i;
@@ -229,6 +230,17 @@ int kvm_arch_put_registers(CPUState *cs, int level) 
        }

    }



    /* Floating point */

    for (i = 0; i < 16; i++) {

        fpu.fprs[i] = env->fregs[i].ll;

    }

    fpu.fpc = env->fpc;



    r = kvm_vcpu_ioctl(cs, KVM_SET_FPU, &fpu);

    if (r < 0) {

        return r;

    }



    /* Do we need to save more than that? */

    if (level == KVM_PUT_RUNTIME_STATE) {

        return 0;
@@ -296,6 +308,7 @@ int kvm_arch_get_registers(CPUState *cs) 
    CPUS390XState *env = &cpu->env;

    struct kvm_sregs sregs;

    struct kvm_regs regs;

    struct kvm_fpu fpu;

    int i, r;



    /* get the PSW */
@@ -336,6 +349,16 @@ int kvm_arch_get_registers(CPUState *cs) 
        }

    }



    /* Floating point */

    r = kvm_vcpu_ioctl(cs, KVM_GET_FPU, &fpu);

    if (r < 0) {

        return r;

    }

    for (i = 0; i < 16; i++) {

        env->fregs[i].ll = fpu.fprs[i];

    }

    env->fpc = fpu.fpc;



    /* The prefix */

    if (cap_sync_regs && cs->kvm_run->kvm_valid_regs & KVM_SYNC_PREFIX) {

        env->psa = cs->kvm_run->s.regs.prefix;