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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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hypervisor/include/dm/vioapic.h
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@@ -57,7 +57,6 @@ struct acrn_single_vioapic {
spinlock_t lock;
struct acrn_vm *vm;
struct ioapic_info chipinfo;
bool ready;
uint32_t ioregsel;
union ioapic_rte rtbl[REDIR_ENTRIES_HW];
/* pin_state status bitmap: 1 - high, 0 - low */