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HV: io: refine state transitions of VHM requests

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Instead of using two members for maintaining the state of a VHM request, this
patch replaces the transitions with a single state. Basically the lifecycle of a
VHM request shall be:

    FREE -> PENDING -> PROCESSING -> COMPLETE -> FREE -> ...

The structure header of vhm_request has more details of the transitions access
limitations under different states.

Also drop the set but unused member vcpu.ioreq_pending.

For backward-compatibility, the obsolete 'valid' member is still kept and
maintained before SOS and DM adapts to the new state transitions.

v2 -> v3:

    * Use complete_ioreq to mark an I/O request finished in
      dm_emulate_(pio|mmio)_post.

Signed-off-by: Junjie Mao <junjie.mao@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>
This commit is contained in:
Junjie Mao
2018-07-27 21:24:39 +08:00
committed by lijinxia
parent 941eb9db02
commit 17771c0ac2
8 changed files with 144 additions and 51 deletions
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3
hypervisor/arch/x86/guest/vioapic.c
View File

@@ -613,12 +613,10 @@ int vioapic_mmio_access_handler(struct vcpu *vcpu, struct io_request *io_req,
gpa,
&data);
mmio->value = (uint64_t)data;
io_req->processed = REQ_STATE_SUCCESS;
} else if (mmio->direction == REQUEST_WRITE) {
vioapic_mmio_write(vm,
gpa,
data);
io_req->processed = REQ_STATE_SUCCESS;
} else {
/* Can never happen due to the range of direction. */
}
@@ -627,6 +625,7 @@ int vioapic_mmio_access_handler(struct vcpu *vcpu, struct io_request *io_req,
ret = -EINVAL;
}
io_req->processed = REQ_STATE_COMPLETE;
return ret;
}