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hv: Add update_vm_vlapic_state API to sync the VM vLAPIC state

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This patch introduces vLAPIC state for a VM. The VM vLAPIC state can
be one of the following
 * VM_VLAPIC_X2APIC - All the vCPUs/vLAPICs (Except for those in Disabled mode) of this
	VM use x2APIC mode
 * VM_VLAPIC_XAPIC - All the vCPUs/vLAPICs (Except for those in Disabled mode) of this
	VM use xAPIC mode
 * VM_VLAPIC_DISABLED - All the vCPUs/vLAPICs of this VM are in Disabled mode
 * VM_VLAPIC_TRANSITION - Some of the vCPUs/vLAPICs of this VM (Except for those in Disabled mode)
	are in xAPIC and the others in x2APIC

Upon a vCPU updating the IA32_APIC_BASE MSR to switch LAPIC mode, this
API is called to sync the vLAPIC state of the VM. Upon VM creation and reset,
vLAPIC state is set to VM_VLAPIC_XAPIC, as ACRN starts the vCPUs vLAPIC in
XAPIC mode.

Tracked-On: #3253
Signed-off-by: Sainath Grandhi <sainath.grandhi@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>
This commit is contained in:
Sainath Grandhi
2019-06-10 16:54:39 -07:00
committed by wenlingz
parent a3fdc7a496
commit f3627d4839
3 changed files with 94 additions and 1 deletions
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2
hypervisor/arch/x86/guest/vlapic.c
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@@ -1763,6 +1763,7 @@ int32_t vlapic_set_apicbase(struct acrn_vlapic *vlapic, uint64_t new)
int32_t ret = 0;
uint64_t changed;
bool change_in_vlapic_mode = false;
struct acrn_vcpu *vcpu = vlapic->vcpu;
if (vlapic->msr_apicbase != new) {
@@ -1783,6 +1784,7 @@ int32_t vlapic_set_apicbase(struct acrn_vlapic *vlapic, uint64_t new)
vlapic->msr_apicbase = new;
vlapic_build_x2apic_id(vlapic);
switch_apicv_mode_x2apic(vlapic->vcpu);
update_vm_vlapic_state(vcpu->vm);
} else {
/*
* TODO: Logic to check for Invalid transitions, Invalid State