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KVM: s390: fix handling of lctl[g]/stctl[g]

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According to the architecture all instructions are suppressing if memory
access is prohibited due to DAT protection, unless stated otherwise for
an instruction.
The lctl[g]/stctl[g] implementations handled this incorrectly since
control register handling was done piecemeal, which means they had
terminating instead of suppressing semantics.
This patch fixes this.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Reviewed-by: Thomas Huth <thuth@linux.vnet.ibm.com>
Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
Heiko Carstens 2014-10-29 10:07:16 +01:00 committed by Christian Borntraeger
parent 2dca485f87
commit fc56eb66c3
1 changed files with 32 additions and 36 deletions
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68
arch/s390/kvm/priv.c
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@ -762,8 +762,8 @@ int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu)
{
int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
u32 val = 0;
int reg, rc;
int reg, rc, nr_regs;
u32 ctl_array[16];
u64 ga;
vcpu->stat.instruction_lctl++;
@ -779,14 +779,15 @@ int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu)
VCPU_EVENT(vcpu, 5, "lctl r1:%x, r3:%x, addr:%llx", reg1, reg3, ga);
trace_kvm_s390_handle_lctl(vcpu, 0, reg1, reg3, ga);
nr_regs = ((reg3 - reg1) & 0xf) + 1;
rc = read_guest(vcpu, ga, ctl_array, nr_regs * sizeof(u32));
if (rc)
return kvm_s390_inject_prog_cond(vcpu, rc);
reg = reg1;
nr_regs = 0;
do {
rc = read_guest(vcpu, ga, &val, sizeof(val));
if (rc)
return kvm_s390_inject_prog_cond(vcpu, rc);
vcpu->arch.sie_block->gcr[reg] &= 0xffffffff00000000ul;
vcpu->arch.sie_block->gcr[reg] |= val;
ga += 4;
vcpu->arch.sie_block->gcr[reg] |= ctl_array[nr_regs++];
if (reg == reg3)
break;
reg = (reg + 1) % 16;
@ -799,9 +800,9 @@ int kvm_s390_handle_stctl(struct kvm_vcpu *vcpu)
{
int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
int reg, rc, nr_regs;
u32 ctl_array[16];
u64 ga;
u32 val;
int reg, rc;
vcpu->stat.instruction_stctl++;
@ -817,26 +818,24 @@ int kvm_s390_handle_stctl(struct kvm_vcpu *vcpu)
trace_kvm_s390_handle_stctl(vcpu, 0, reg1, reg3, ga);
reg = reg1;
nr_regs = 0;
do {
val = vcpu->arch.sie_block->gcr[reg] & 0x00000000fffffffful;
rc = write_guest(vcpu, ga, &val, sizeof(val));
if (rc)
return kvm_s390_inject_prog_cond(vcpu, rc);
ga += 4;
ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
if (reg == reg3)
break;
reg = (reg + 1) % 16;
} while (1);
return 0;
rc = write_guest(vcpu, ga, ctl_array, nr_regs * sizeof(u32));
return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
}
static int handle_lctlg(struct kvm_vcpu *vcpu)
{
int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
u64 ga, val;
int reg, rc;
int reg, rc, nr_regs;
u64 ctl_array[16];
u64 ga;
vcpu->stat.instruction_lctlg++;
@ -848,17 +847,17 @@ static int handle_lctlg(struct kvm_vcpu *vcpu)
if (ga & 7)
return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
reg = reg1;
VCPU_EVENT(vcpu, 5, "lctlg r1:%x, r3:%x, addr:%llx", reg1, reg3, ga);
trace_kvm_s390_handle_lctl(vcpu, 1, reg1, reg3, ga);
nr_regs = ((reg3 - reg1) & 0xf) + 1;
rc = read_guest(vcpu, ga, ctl_array, nr_regs * sizeof(u64));
if (rc)
return kvm_s390_inject_prog_cond(vcpu, rc);
reg = reg1;
nr_regs = 0;
do {
rc = read_guest(vcpu, ga, &val, sizeof(val));
if (rc)
return kvm_s390_inject_prog_cond(vcpu, rc);
vcpu->arch.sie_block->gcr[reg] = val;
ga += 8;
vcpu->arch.sie_block->gcr[reg] = ctl_array[nr_regs++];
if (reg == reg3)
break;
reg = (reg + 1) % 16;
@ -871,8 +870,9 @@ static int handle_stctg(struct kvm_vcpu *vcpu)
{
int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
u64 ga, val;
int reg, rc;
int reg, rc, nr_regs;
u64 ctl_array[16];
u64 ga;
vcpu->stat.instruction_stctg++;
@ -884,23 +884,19 @@ static int handle_stctg(struct kvm_vcpu *vcpu)
if (ga & 7)
return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
reg = reg1;
VCPU_EVENT(vcpu, 5, "stctg r1:%x, r3:%x, addr:%llx", reg1, reg3, ga);
trace_kvm_s390_handle_stctl(vcpu, 1, reg1, reg3, ga);
reg = reg1;
nr_regs = 0;
do {
val = vcpu->arch.sie_block->gcr[reg];
rc = write_guest(vcpu, ga, &val, sizeof(val));
if (rc)
return kvm_s390_inject_prog_cond(vcpu, rc);
ga += 8;
ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
if (reg == reg3)
break;
reg = (reg + 1) % 16;
} while (1);
return 0;
rc = write_guest(vcpu, ga, ctl_array, nr_regs * sizeof(u64));
return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
}
static const intercept_handler_t eb_handlers[256] = {