OpenE2K
/
qemu-e2k
13
4
Fork 0
Code Issues 4 Pull Requests Projects 2 Releases Activity

s390: use sync regs for register transfer 

Newer kernels provide the guest registers in kvm_run. Lets use
those if available (i.e. the capability is set). This avoids
ioctls on cpu_synchronize_state making intercepts faster.

In addition, we have now the prefix register, the access registers
the control registers up to date. This helps in certain cases,
e.g. for resolving kernel module addresses with gdb on a guest.

On return, we update the registers according to the level statement,
i.e. we put all registers for KVM_PUT_FULL_STATE and _RESET_STATE.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Christian Borntraeger 2012-10-29 02:13:21 +00:00 committed by Alexander Graf
parent 1b3e6f88dc
commit 5b08b344bf
1 changed files with 97 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

122
target-s390x/kvm.c
View File

@ -67,8 +67,11 @@ const KVMCapabilityInfo kvm_arch_required_capabilities[] = {
KVM_CAP_LAST_INFO
};
static int cap_sync_regs;
int kvm_arch_init(KVMState *s)
{
cap_sync_regs = kvm_check_extension(s, KVM_CAP_SYNC_REGS);
return 0;
}
@ -90,48 +93,117 @@ void kvm_arch_reset_vcpu(CPUS390XState *env)
int kvm_arch_put_registers(CPUS390XState *env, int level)
{
struct kvm_sregs sregs;
struct kvm_regs regs;
int ret;
int i;
ret = kvm_vcpu_ioctl(env, KVM_GET_REGS, &regs);
if (ret < 0) {
return ret;
}
for (i = 0; i < 16; i++) {
regs.gprs[i] = env->regs[i];
}
ret = kvm_vcpu_ioctl(env, KVM_SET_REGS, &regs);
if (ret < 0) {
return ret;
}
/* always save the PSW and the GPRS*/
env->kvm_run->psw_addr = env->psw.addr;
env->kvm_run->psw_mask = env->psw.mask;
return ret;
if (cap_sync_regs && env->kvm_run->kvm_valid_regs & KVM_SYNC_GPRS) {
for (i = 0; i < 16; i++) {
env->kvm_run->s.regs.gprs[i] = env->regs[i];
env->kvm_run->kvm_dirty_regs |= KVM_SYNC_GPRS;
}
} else {
for (i = 0; i < 16; i++) {
regs.gprs[i] = env->regs[i];
}
ret = kvm_vcpu_ioctl(env, KVM_SET_REGS, &regs);
if (ret < 0) {
return ret;
}
}
/* Do we need to save more than that? */
if (level == KVM_PUT_RUNTIME_STATE) {
return 0;
}
if (cap_sync_regs &&
env->kvm_run->kvm_valid_regs & KVM_SYNC_ACRS &&
env->kvm_run->kvm_valid_regs & KVM_SYNC_CRS) {
for (i = 0; i < 16; i++) {
env->kvm_run->s.regs.acrs[i] = env->aregs[i];
env->kvm_run->s.regs.crs[i] = env->cregs[i];
}
env->kvm_run->kvm_dirty_regs |= KVM_SYNC_ACRS;
env->kvm_run->kvm_dirty_regs |= KVM_SYNC_CRS;
} else {
for (i = 0; i < 16; i++) {
sregs.acrs[i] = env->aregs[i];
sregs.crs[i] = env->cregs[i];
}
ret = kvm_vcpu_ioctl(env, KVM_SET_SREGS, &sregs);
if (ret < 0) {
return ret;
}
}
/* Finally the prefix */
if (cap_sync_regs && env->kvm_run->kvm_valid_regs & KVM_SYNC_PREFIX) {
env->kvm_run->s.regs.prefix = env->psa;
env->kvm_run->kvm_dirty_regs |= KVM_SYNC_PREFIX;
} else {
/* prefix is only supported via sync regs */
}
return 0;
}
int kvm_arch_get_registers(CPUS390XState *env)
{
int ret;
struct kvm_sregs sregs;
struct kvm_regs regs;
int ret;
int i;
ret = kvm_vcpu_ioctl(env, KVM_GET_REGS, &regs);
if (ret < 0) {
return ret;
}
for (i = 0; i < 16; i++) {
env->regs[i] = regs.gprs[i];
}
/* get the PSW */
env->psw.addr = env->kvm_run->psw_addr;
env->psw.mask = env->kvm_run->psw_mask;
/* the GPRS */
if (cap_sync_regs && env->kvm_run->kvm_valid_regs & KVM_SYNC_GPRS) {
for (i = 0; i < 16; i++) {
env->regs[i] = env->kvm_run->s.regs.gprs[i];
}
} else {
ret = kvm_vcpu_ioctl(env, KVM_GET_REGS, &regs);
if (ret < 0) {
return ret;
}
for (i = 0; i < 16; i++) {
env->regs[i] = regs.gprs[i];
}
}
/* The ACRS and CRS */
if (cap_sync_regs &&
env->kvm_run->kvm_valid_regs & KVM_SYNC_ACRS &&
env->kvm_run->kvm_valid_regs & KVM_SYNC_CRS) {
for (i = 0; i < 16; i++) {
env->aregs[i] = env->kvm_run->s.regs.acrs[i];
env->cregs[i] = env->kvm_run->s.regs.crs[i];
}
} else {
ret = kvm_vcpu_ioctl(env, KVM_GET_SREGS, &sregs);
if (ret < 0) {
return ret;
}
for (i = 0; i < 16; i++) {
env->aregs[i] = sregs.acrs[i];
env->cregs[i] = sregs.crs[i];
}
}
/* Finally the prefix */
if (cap_sync_regs && env->kvm_run->kvm_valid_regs & KVM_SYNC_PREFIX) {
env->psa = env->kvm_run->s.regs.prefix;
} else {
/* no prefix without sync regs */
}
return 0;
}