From: Thomas Huth <th...@linux.vnet.ibm.com>
Interception of the SET CLOCK instruction is mandatory, so this patch
provides a simple handler for this instruction (by setting up the
"epoch" field in the sie_block).
Signed-off-by: Thomas Huth <th...@linux.vnet.ibm.com>
Acked-by: Cornelia Huck <cornelia.h...@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntrae...@de.ibm.com>
---
arch/s390/kvm/priv.c | 33 +++++++++++++++++++++++++++++++++
1 file changed, 33 insertions(+)
diff --git a/arch/s390/kvm/priv.c b/arch/s390/kvm/priv.c
index 6f95994..2440602 100644
--- a/arch/s390/kvm/priv.c
+++ b/arch/s390/kvm/priv.c
@@ -30,6 +30,38 @@
#include "kvm-s390.h"
#include "trace.h"
+/* Handle SCK (SET CLOCK) interception */
+static int handle_set_clock(struct kvm_vcpu *vcpu)
+{
+ struct kvm_vcpu *cpup;
+ s64 hostclk, val;
+ u64 op2;
+ int i;
+
+ if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
+ return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
+
+ op2 = kvm_s390_get_base_disp_s(vcpu);
+ if (op2 & 7) /* Operand must be on a doubleword boundary */
+ return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
+ if (get_guest(vcpu, val, (u64 __user *) op2))
+ return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
+
+ if (store_tod_clock(&hostclk)) {
+ kvm_s390_set_psw_cc(vcpu, 3);
+ return 0;
+ }
+ val = (val - hostclk) & ~0x3fUL;
+
+ mutex_lock(&vcpu->kvm->lock);
+ kvm_for_each_vcpu(i, cpup, vcpu->kvm)
+ cpup->arch.sie_block->epoch = val;
+ mutex_unlock(&vcpu->kvm->lock);
+
+ kvm_s390_set_psw_cc(vcpu, 0);
+ return 0;
+}
+
static int handle_set_prefix(struct kvm_vcpu *vcpu)
{
u64 operand2;
@@ -465,6 +497,7 @@ out_exception:
static const intercept_handler_t b2_handlers[256] = {
[0x02] = handle_stidp,
+ [0x04] = handle_set_clock,
[0x10] = handle_set_prefix,
[0x11] = handle_store_prefix,
[0x12] = handle_store_cpu_address,
--
1.8.3.1
--
To unsubscribe from this list: send the line "unsubscribe kvm" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
