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hw/intc/arm_gicv3_redist: Implement gicv3_redist_process_vlpi()

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Implement the function gicv3_redist_process_vlpi(), which was left as
just a stub earlier.  This function deals with being handed a VLPI by
the ITS.  It must set the bit in the pending table.  If the vCPU is
currently resident we must recalculate the highest priority pending
vLPI; otherwise we may need to ring a "doorbell" interrupt to let the
hypervisor know it might want to reschedule the vCPU.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20220408141550.1271295-32-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2022-04-08 15:15:40 +01:00
parent b76eb5f4db
commit d7d39749e6
1 changed files with 44 additions and 4 deletions
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48
hw/intc/arm_gicv3_redist.c
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@ -60,6 +60,19 @@ static uint32_t gicr_read_bitmap_reg(GICv3CPUState *cs, MemTxAttrs attrs,
return reg;
}
static bool vcpu_resident(GICv3CPUState *cs, uint64_t vptaddr)
{
/*
* Return true if a vCPU is resident, which is defined by
* whether the GICR_VPENDBASER register is marked VALID and
* has the right virtual pending table address.
*/
if (!FIELD_EX64(cs->gicr_vpendbaser, GICR_VPENDBASER, VALID)) {
return false;
}
return vptaddr == (cs->gicr_vpendbaser & R_GICR_VPENDBASER_PHYADDR_MASK);
}
/**
* update_for_one_lpi: Update pending information if this LPI is better
*
@ -1004,10 +1017,37 @@ void gicv3_redist_vlpi_pending(GICv3CPUState *cs, int irq, int level)
void gicv3_redist_process_vlpi(GICv3CPUState *cs, int irq, uint64_t vptaddr,
int doorbell, int level)
{
/*
* The redistributor handling for being handed a VLPI by the ITS
* will be added in a subsequent commit.
*/
bool bit_changed;
bool resident = vcpu_resident(cs, vptaddr);
uint64_t ctbase;
if (resident) {
uint32_t idbits = FIELD_EX64(cs->gicr_vpropbaser, GICR_VPROPBASER, IDBITS);
if (irq >= (1ULL << (idbits + 1))) {
return;
}
}
bit_changed = set_pending_table_bit(cs, vptaddr, irq, level);
if (resident && bit_changed) {
if (level) {
/* Check whether this vLPI is now the best */
ctbase = cs->gicr_vpropbaser & R_GICR_VPROPBASER_PHYADDR_MASK;
update_for_one_lpi(cs, irq, ctbase, true, &cs->hppvlpi);
gicv3_cpuif_virt_irq_fiq_update(cs);
} else {
/* Only need to recalculate if this was previously the best vLPI */
if (irq == cs->hppvlpi.irq) {
gicv3_redist_update_vlpi(cs);
}
}
}
if (!resident && level && doorbell != INTID_SPURIOUS &&
(cs->gicr_ctlr & GICR_CTLR_ENABLE_LPIS)) {
/* vCPU is not currently resident: ring the doorbell */
gicv3_redist_process_lpi(cs, doorbell, 1);
}
}
void gicv3_redist_mov_vlpi(GICv3CPUState *src, uint64_t src_vptaddr,