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hv: vioapic: expose ioapic to guest unconditionally

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Some OSes assume the platform must have the IOAPIC. For example:
Linux Kernel allocates IRQ force from GSI (0 if there's no PIC and IOAPIC) on x86.
And it thinks IRQ 0 is an architecture special IRQ, not for device driver. As a
result, the device driver may goes wrong if the allocated IRQ is 0 for RTVM.

This patch expose vIOAPIC to RTVM with LAPIC passthru even though the RTVM can't
use IOAPIC, it servers as a place holder to fullfil the guest assumption.

After vIOAPIC has exposed to guest unconditionally, the 'ready' field could be
removed since we do vIOAPIC initialization for each guest.

Tracked-On: #4691
Signed-off-by: Li Fei1 <fei1.li@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>
This commit is contained in:
Li Fei1
2020-04-21 10:18:10 +08:00
committed by wenlingz
parent f2479f6489
commit 80c7da8f1c
4 changed files with 19 additions and 24 deletions
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10
hypervisor/arch/x86/guest/vm.c
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@@ -471,10 +471,12 @@ int32_t create_vm(uint16_t vm_id, uint64_t pcpu_bitmap, struct acrn_vm_config *v
/* vpic wire_mode default is INTR */
vm->wire_mode = VPIC_WIRE_INTR;
/* Init full emulated vIOAPIC instance */
if (!is_lapic_pt_configured(vm)) {
vioapic_init(vm);
}
/* Init full emulated vIOAPIC instance:
* Present a virtual IOAPIC to guest, as a placeholder interrupt controller,
* even if the guest uses PT LAPIC. This is to satisfy the guest OSes,
* in some cases, though the functionality of vIOAPIC doesn't work.
*/
vioapic_init(vm);
/* Populate return VM handle */
*rtn_vm = vm;