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KVM: kvmtrace: Remove use of bit fields in kvm trace structure

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This patch fixes kvmtrace use on big endian systems. When using bit fields the
compiler will lay data out in the wrong order expected when laid down into a
file.
This fixes it by using one variable instead of using bit fields.

Signed-off-by: Jerone Young <jyoung5@us.ibm.com>
Signed-off-by: Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Christian Ehrhardt 2008-07-14 14:00:00 +02:00 committed by Avi Kivity
parent 80e31d4f61
commit e32c8f2c07
2 changed files with 23 additions and 11 deletions
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17
include/linux/kvm.h
View File

@ -311,9 +311,13 @@ struct kvm_s390_interrupt {
/* This structure represents a single trace buffer record. */
struct kvm_trace_rec {
__u32 event:28;
__u32 extra_u32:3;
__u32 cycle_in:1;
/* variable rec_val
* is split into:
* bits 0 - 27 -> event id
* bits 28 -30 -> number of extra data args of size u32
* bits 31 -> binary indicator for if tsc is in record
*/
__u32 rec_val;
__u32 pid;
__u32 vcpu_id;
union {
@ -327,6 +331,13 @@ struct kvm_trace_rec {
} u;
};
#define TRACE_REC_EVENT_ID(val) \
(0x0fffffff & (val))
#define TRACE_REC_NUM_DATA_ARGS(val) \
(0x70000000 & ((val) << 28))
#define TRACE_REC_TCS(val) \
(0x80000000 & ((val) << 31))
#define KVMIO 0xAE
/*

17
virt/kvm/kvm_trace.c
View File

@ -54,12 +54,13 @@ static void kvm_add_trace(void *probe_private, void *call_data,
struct kvm_trace *kt = kvm_trace;
struct kvm_trace_rec rec;
struct kvm_vcpu *vcpu;
int i, extra, size;
int i, size;
u32 extra;
if (unlikely(kt->trace_state != KVM_TRACE_STATE_RUNNING))
return;
rec.event = va_arg(*args, u32);
rec.rec_val = TRACE_REC_EVENT_ID(va_arg(*args, u32));
vcpu = va_arg(*args, struct kvm_vcpu *);
rec.pid = current->tgid;
rec.vcpu_id = vcpu->vcpu_id;
@ -67,21 +68,21 @@ static void kvm_add_trace(void *probe_private, void *call_data,
extra = va_arg(*args, u32);
WARN_ON(!(extra <= KVM_TRC_EXTRA_MAX));
extra = min_t(u32, extra, KVM_TRC_EXTRA_MAX);
rec.extra_u32 = extra;
rec.cycle_in = p->cycle_in;
rec.rec_val |= TRACE_REC_TCS(p->cycle_in)
| TRACE_REC_NUM_DATA_ARGS(extra);
if (rec.cycle_in) {
if (p->cycle_in) {
rec.u.cycle.cycle_u64 = get_cycles();
for (i = 0; i < rec.extra_u32; i++)
for (i = 0; i < extra; i++)
rec.u.cycle.extra_u32[i] = va_arg(*args, u32);
} else {
for (i = 0; i < rec.extra_u32; i++)
for (i = 0; i < extra; i++)
rec.u.nocycle.extra_u32[i] = va_arg(*args, u32);
}
size = calc_rec_size(rec.cycle_in, rec.extra_u32 * sizeof(u32));
size = calc_rec_size(p->cycle_in, extra * sizeof(u32));
relay_write(kt->rchan, &rec, size);
}