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hv: distinguish between LAPIC_PASSTHROUGH configured vs enabled

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ACRN supports LAPIC emulation for guests using x86 APICv. When guest OS/BIOS
switches from xAPIC to x2APIC mode of operation, ACRN also supports switching
froom LAPIC emulation to LAPIC passthrough to guest. User/developer needs to
configure GUEST_FLAG_LAPIC_PASSTHROUGH for guest_flags in the corresponding
VM's config for ACRN to enable LAPIC passthrough.

This patch does the following

1)Fixes a bug in the abovementioned feature. For a guest that is
configured with GUEST_FLAG_LAPIC_PASSTHROUGH, during the time period guest is
using xAPIC mode of LAPIC,  virtual interrupts are not delivered. This can be
manifested as guest hang when it does not receive virtual timer interrupts.

2)ACRN exposes physical topology via CPUID leaf 0xb to LAPIC PT VMs. This patch
removes that condition and exposes virtual topology via CPUID leaf 0xb.

Tracked-On: #3136
Signed-off-by: Sainath Grandhi <sainath.grandhi@intel.com>
Reviewed-by: Eddie Dong <eddie.dong@intel.com>
This commit is contained in:
Sainath Grandhi
2019-05-15 15:55:09 -07:00
committed by Eddie Dong
parent cb6a3e8f08
commit 536c69b9ff
10 changed files with 26 additions and 18 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
hypervisor/include/arch/x86/guest/vlapic.h
View File

@@ -210,7 +210,7 @@ void vlapic_calc_dest(struct acrn_vm *vm, uint64_t *dmask, bool is_broadcast,
uint32_t dest, bool phys, bool lowprio);
void vlapic_calc_dest_lapic_pt(struct acrn_vm *vm, uint64_t *dmask, bool is_broadcast,
uint32_t dest, bool phys);
bool is_lapic_pt_enabled(struct acrn_vm *vm);
/**
* @}
*/

2
hypervisor/include/arch/x86/guest/vm.h
View File

@@ -216,7 +216,7 @@ extern vm_sw_loader_t vm_sw_loader;
void vrtc_init(struct acrn_vm *vm);
bool is_lapic_pt(const struct acrn_vm *vm);
bool is_lapic_pt_configured(const struct acrn_vm *vm);
bool is_rt_vm(const struct acrn_vm *vm);
bool vm_hide_mtrr(const struct acrn_vm *vm);