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hv: enforce no interrupt to RT VM via vlapic once lapic pt

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Because we depend on guest OS to switch x2apic mode to enable lapic pass-thru, vlapic is working at the early stage of booting, eg: in virtual boot loader.
After lapic pass-thru enabled, no interrupt should be injected via vlapic any more.

This commit resets the vlapic to clear the pending status and adds ptapic_ops to enforce that no more interrupt accepted/injected via vlapic.

Tracked-On: #3227
Signed-off-by: Yan, Like <like.yan@intel.com>
This commit is contained in:
Yan, Like 2019-07-02 16:39:19 +08:00 committed by wenlingz
parent 97f6097f04
commit a4abeaf980
1 changed files with 36 additions and 0 deletions
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36
hypervisor/arch/x86/guest/vlapic.c
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@ -1699,6 +1699,39 @@ uint64_t vlapic_get_apicbase(const struct acrn_vlapic *vlapic)
return vlapic->msr_apicbase;
}
static void ptapic_accept_intr(struct acrn_vlapic *vlapic, uint32_t vector, __unused bool level)
{
pr_err("Invalid op %s, VM%u, vCPU%u, vector %u", __func__,
vlapic->vm->vm_id, vlapic->vcpu->vcpu_id, vector);
}
static bool ptapic_inject_intr(struct acrn_vlapic *vlapic,
__unused bool guest_irq_enabled, __unused bool injected)
{
pr_err("Invalid op %s, VM%u, vCPU%u", __func__, vlapic->vm->vm_id, vlapic->vcpu->vcpu_id);
return injected;
}
static bool ptapic_has_pending_delivery_intr(__unused struct acrn_vcpu *vcpu)
{
return false;
}
static bool ptapic_invalid(__unused uint32_t offset)
{
return false;
}
static const struct acrn_apicv_ops ptapic_ops = {
.accept_intr = ptapic_accept_intr,
.inject_intr = ptapic_inject_intr,
.has_pending_delivery_intr = ptapic_has_pending_delivery_intr,
.apic_read_access_may_valid = ptapic_invalid,
.apic_write_access_may_valid = ptapic_invalid,
.x2apic_read_msr_may_valid = ptapic_invalid,
.x2apic_write_msr_may_valid = ptapic_invalid,
};
int32_t vlapic_set_apicbase(struct acrn_vlapic *vlapic, uint64_t new)
{
int32_t ret = 0;
@ -1722,6 +1755,9 @@ int32_t vlapic_set_apicbase(struct acrn_vlapic *vlapic, uint64_t new)
if (change_in_vlapic_mode) {
if ((new & APICBASE_LAPIC_MODE) ==
(APICBASE_XAPIC | APICBASE_X2APIC)) {
if (is_lapic_pt_configured(vcpu->vm)) {
vlapic_reset(vlapic, &ptapic_ops);
}
vlapic->msr_apicbase = new;
vlapic_build_x2apic_id(vlapic);
switch_apicv_mode_x2apic(vlapic->vcpu);