From 860643bc5aa902f9b736c57b66e301ef08a2b68e Mon Sep 17 00:00:00 2001 From: Christian Borntraeger Date: Thu, 3 Apr 2014 15:54:58 +0200 Subject: s390x/kvm: rework KVM synchronize to tracing for some ONEREGS Some ONE_REGS on s390 are not protected by a capability. Older kernels might not provide those and return an error. Fortunately these registers are only critical for the migration path. There is no need to error out on reset and normal runtime. Furthermore, these kernels don't provide a proper dirty bitmap anyway, so let's use tracing for those errors. Also provide generic one reg helper to simplify the code. Signed-off-by: Christian Borntraeger Reviewed-by: Cornelia Huck Signed-off-by: Cornelia Huck --- target-s390x/kvm.c | 143 ++++++++++++++++++++++++----------------------------- 1 file changed, 65 insertions(+), 78 deletions(-) (limited to 'target-s390x') diff --git a/target-s390x/kvm.c b/target-s390x/kvm.c index 2b2dcdc485..daaabbd674 100644 --- a/target-s390x/kvm.c +++ b/target-s390x/kvm.c @@ -36,6 +36,7 @@ #include "sysemu/device_tree.h" #include "qapi/qmp/qjson.h" #include "monitor/monitor.h" +#include "trace.h" /* #define DEBUG_KVM */ @@ -128,14 +129,42 @@ void kvm_arch_reset_vcpu(CPUState *cpu) } } +static int kvm_set_one_reg(CPUState *cs, uint64_t id, void *source) +{ + struct kvm_one_reg reg; + int r; + + reg.id = id; + reg.addr = (uint64_t) source; + r = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, ®); + if (r) { + trace_kvm_failed_reg_set(id, strerror(errno)); + } + return r; +} + +static int kvm_get_one_reg(CPUState *cs, uint64_t id, void *target) +{ + struct kvm_one_reg reg; + int r; + + reg.id = id; + reg.addr = (uint64_t) target; + r = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, ®); + if (r) { + trace_kvm_failed_reg_get(id, strerror(errno)); + } + return r; +} + + int kvm_arch_put_registers(CPUState *cs, int level) { S390CPU *cpu = S390_CPU(cs); CPUS390XState *env = &cpu->env; - struct kvm_one_reg reg; struct kvm_sregs sregs; struct kvm_regs regs; - int ret; + int r; int i; /* always save the PSW and the GPRS*/ @@ -151,9 +180,9 @@ int kvm_arch_put_registers(CPUState *cs, int level) for (i = 0; i < 16; i++) { regs.gprs[i] = env->regs[i]; } - ret = kvm_vcpu_ioctl(cs, KVM_SET_REGS, ®s); - if (ret < 0) { - return ret; + r = kvm_vcpu_ioctl(cs, KVM_SET_REGS, ®s); + if (r < 0) { + return r; } } @@ -162,47 +191,27 @@ int kvm_arch_put_registers(CPUState *cs, int level) return 0; } - reg.id = KVM_REG_S390_CPU_TIMER; - reg.addr = (__u64)&(env->cputm); - ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, ®); - if (ret < 0) { - return ret; - } - - reg.id = KVM_REG_S390_CLOCK_COMP; - reg.addr = (__u64)&(env->ckc); - ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, ®); - if (ret < 0) { - return ret; - } - - reg.id = KVM_REG_S390_TODPR; - reg.addr = (__u64)&(env->todpr); - ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, ®); - if (ret < 0) { - return ret; - } + /* + * These ONE_REGS are not protected by a capability. As they are only + * necessary for migration we just trace a possible error, but don't + * return with an error return code. + */ + kvm_set_one_reg(cs, KVM_REG_S390_CPU_TIMER, &env->cputm); + kvm_set_one_reg(cs, KVM_REG_S390_CLOCK_COMP, &env->ckc); + kvm_set_one_reg(cs, KVM_REG_S390_TODPR, &env->todpr); if (cap_async_pf) { - reg.id = KVM_REG_S390_PFTOKEN; - reg.addr = (__u64)&(env->pfault_token); - ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, ®); - if (ret < 0) { - return ret; + r = kvm_set_one_reg(cs, KVM_REG_S390_PFTOKEN, &env->pfault_token); + if (r < 0) { + return r; } - - reg.id = KVM_REG_S390_PFCOMPARE; - reg.addr = (__u64)&(env->pfault_compare); - ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, ®); - if (ret < 0) { - return ret; + r = kvm_set_one_reg(cs, KVM_REG_S390_PFCOMPARE, &env->pfault_compare); + if (r < 0) { + return r; } - - reg.id = KVM_REG_S390_PFSELECT; - reg.addr = (__u64)&(env->pfault_select); - ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, ®); - if (ret < 0) { - return ret; + r = kvm_set_one_reg(cs, KVM_REG_S390_PFSELECT, &env->pfault_select); + if (r < 0) { + return r; } } @@ -220,9 +229,9 @@ int kvm_arch_put_registers(CPUState *cs, int level) sregs.acrs[i] = env->aregs[i]; sregs.crs[i] = env->cregs[i]; } - ret = kvm_vcpu_ioctl(cs, KVM_SET_SREGS, &sregs); - if (ret < 0) { - return ret; + r = kvm_vcpu_ioctl(cs, KVM_SET_SREGS, &sregs); + if (r < 0) { + return r; } } @@ -240,7 +249,6 @@ int kvm_arch_get_registers(CPUState *cs) { S390CPU *cpu = S390_CPU(cs); CPUS390XState *env = &cpu->env; - struct kvm_one_reg reg; struct kvm_sregs sregs; struct kvm_regs regs; int i, r; @@ -288,46 +296,25 @@ int kvm_arch_get_registers(CPUState *cs) env->psa = cs->kvm_run->s.regs.prefix; } - /* One Regs */ - reg.id = KVM_REG_S390_CPU_TIMER; - reg.addr = (__u64)&(env->cputm); - r = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, ®); - if (r < 0) { - return r; - } - - reg.id = KVM_REG_S390_CLOCK_COMP; - reg.addr = (__u64)&(env->ckc); - r = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, ®); - if (r < 0) { - return r; - } - - reg.id = KVM_REG_S390_TODPR; - reg.addr = (__u64)&(env->todpr); - r = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, ®); - if (r < 0) { - return r; - } + /* + * These ONE_REGS are not protected by a capability. As they are only + * necessary for migration we just trace a possible error, but don't + * return with an error return code. + */ + kvm_get_one_reg(cs, KVM_REG_S390_CPU_TIMER, &env->cputm); + kvm_get_one_reg(cs, KVM_REG_S390_CLOCK_COMP, &env->ckc); + kvm_get_one_reg(cs, KVM_REG_S390_TODPR, &env->todpr); if (cap_async_pf) { - reg.id = KVM_REG_S390_PFTOKEN; - reg.addr = (__u64)&(env->pfault_token); - r = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, ®); + r = kvm_get_one_reg(cs, KVM_REG_S390_PFTOKEN, &env->pfault_token); if (r < 0) { return r; } - - reg.id = KVM_REG_S390_PFCOMPARE; - reg.addr = (__u64)&(env->pfault_compare); - r = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, ®); + r = kvm_get_one_reg(cs, KVM_REG_S390_PFCOMPARE, &env->pfault_compare); if (r < 0) { return r; } - - reg.id = KVM_REG_S390_PFSELECT; - reg.addr = (__u64)&(env->pfault_select); - r = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, ®); + r = kvm_get_one_reg(cs, KVM_REG_S390_PFSELECT, &env->pfault_select); if (r < 0) { return r; } -- cgit v1.2.3