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hv: irq: identical vector mapping if LAPIC passthough

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In local APIC passthrough case, when devices triggered a INTx interrupt, this
interrupt would be delivered to vCPU directly. For this case, need to set the
virtual vector in
the 'Interrupt Vector' field of physical IOxAPIC I/O REDIRECTION TABLE REGISTER
(bits 7:0) and 'Vector' field of vt-d Interrupt Remapping Table Entry (IRTE)
for Remapped Interrupts.

Assumption:
(a) IOAPIC pins won't be shared between LAPIC PT guest and other guests;
(b) The guest would not trigger this IRQ before it switched to x2 APIC mode.

Tracked-On: #5923
Signed-off-by: Zide Chen <zide.chen@intel.com>
This commit is contained in:
Zide Chen 2021-04-22 10:46:51 -07:00 committed by wenlingz
parent db98f01b6e
commit 94cbe909ee
1 changed files with 18 additions and 3 deletions
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21
hypervisor/arch/x86/guest/assign.c
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@ -213,7 +213,22 @@ ptirq_build_physical_rte(struct acrn_vm *vm, struct ptirq_remapping_info *entry)
}
/* update physical delivery mode, dest mode(logical) & vector */
vector = irq_to_vector(phys_irq);
if (is_lapic_pt_configured(vm)) {
/*
* In local APIC passthrough case, when devices triggered a INTx interrupt, this interrupt
* would be delivered to vCPU directly. For this case, need to set the virtual vector in
* the 'Interrupt Vector' field of physical IOxAPIC I/O REDIRECTION TABLE REGISTER (bits 7:0)
* and 'Vector' field of vt-d Interrupt Remapping Table Entry (IRTE) for Remapped Interrupts.
*
* Assumption:
* (a) IOAPIC pins won't be shared between LAPIC PT guest and other guests;
* (b) The guest would not trigger this IRQ before it switched to x2 APIC mode.
*/
vector = rte.bits.vector;
} else {
vector = irq_to_vector(phys_irq);
}
dest_mask = calculate_logical_dest_mask(pdmask);
irte.value.lo_64 = 0UL;
@ -638,7 +653,7 @@ int32_t ptirq_prepare_msix_remap(struct acrn_vm *vm, uint16_t virt_bdf, uint16_t
return ret;
}
static void activate_physical_ioapic(struct acrn_vm *vm,
static void activate_ioapic_rte(struct acrn_vm *vm,
struct ptirq_remapping_info *entry)
{
union ioapic_rte rte;
@ -759,7 +774,7 @@ int32_t ptirq_intx_pin_remap(struct acrn_vm *vm, uint32_t virt_gsi, enum intx_ct
}
if (status == 0) {
activate_physical_ioapic(vm, entry);
activate_ioapic_rte(vm, entry);
}
return status;