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50e4bc1758
This patch refactors how I/O instructions are emulated, in order for a unify the
I/O emulation path. The major control flow includes:
1. pio_instr_vmexit_handler (entry point for handling vmexit on I/O instruction):
Extract port address, register size, direction and value (for write only),
fill in an I/O request (of type io_request), invokes do_io to handle that
and update the guest registers if the request has been successfully handled
when do_io returns.
2. emulate_io:
Handle the given I/O request. The request is handled or sent to VHM if it
returns 0 (the actual status can be found in io_req->processed). On errors a
negative error code is returned.
3. emulate_pio_by_handler:
Look for the PIO handler for the given request and invoke that
handler. Return 0 if a proper handler is found and invoked (the status of
the emulation can be found in io_req->processed), -EIO when the request
spans across devices, and -ENODEV when no handler is found.
4. emulate_pio_post:
Update guest registers after the emulation is done. Currently this can
happen either right after do_io() or after the vcpu is resumed. Status check
on the I/O request and follow-up actions on failure will also go here.
Note:
Currently do_io can return 0 with io_req->processed being REQ_STATE_PENDING if
the request is sent to VHM for further processing. In this case the current vcpu
will be paused after handling this vm_exit, and dm_emulate_pio_post will be
invoked to do the rest after this vcpu is resumed. When vcpus are scheduled back
to exactly where they are scheduled out later, do_io should be responsible for
the post_work and the processing of do_io results shall be mostly the same.
v2 -> v3:
* Rename: emulate_pio_by_handler -> hv_emulate_pio.
* Properly mask the value passed to port I/O handler.
v1 -> v2:
* Rename: do_io -> emulate_io.
* Rename io_instr_vmexit_handler -> pio_instr_vmexit_handler to reflect the
fact that it handles port I/O only.
Signed-off-by: Junjie Mao <junjie.mao@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>
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|---|---|---|
| .. | ||
| configs | ||
| debug | ||
| guest | ||
| assign.c | ||
| cpu_primary.S | ||
| cpu_state_tbl.c | ||
| cpu.c | ||
| cpuid.c | ||
| ept.c | ||
| gdt.c | ||
| idt.S | ||
| io.c | ||
| ioapic.c | ||
| irq.c | ||
| Kconfig | ||
| lapic.c | ||
| mmu.c | ||
| mtrr.c | ||
| notify.c | ||
| pagetable.c | ||
| pm.c | ||
| retpoline-thunk.S | ||
| softirq.c | ||
| timer.c | ||
| trampoline.S | ||
| trusty2.c | ||
| trusty.c | ||
| virq.c | ||
| vmexit.c | ||
| vmx_asm.S | ||
| vmx.c | ||
| vtd.c | ||
| wakeup.S | ||