Commit 86d709ce authored by Shuo Liu's avatar Shuo Liu Committed by Ingo Molnar

x86/acrn: Allow ACRN guest to use X2APIC mode

The ACRN Hypervisor did not support x2APIC and thus x2APIC support was
disabled by always returning false when VM checked for x2APIC support.

ACRN received full support of x2APIC and exports the capability through
CPUID feature bits.

Let VM decide if it needs to switch to x2APIC mode according to CPUID
features.
Originally-by: default avatarYakui Zhao <yakui.zhao@intel.com>
Signed-off-by: default avatarShuo Liu <shuo.a.liu@intel.com>
Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
Reviewed-by: default avatarReinette Chatre <reinette.chatre@intel.com>
Link: https://lore.kernel.org/r/20200806113802.9325-1-shuo.a.liu@intel.com
parent 7b4ea945
...@@ -11,6 +11,7 @@ ...@@ -11,6 +11,7 @@
#include <linux/interrupt.h> #include <linux/interrupt.h>
#include <asm/apic.h> #include <asm/apic.h>
#include <asm/cpufeatures.h>
#include <asm/desc.h> #include <asm/desc.h>
#include <asm/hypervisor.h> #include <asm/hypervisor.h>
#include <asm/idtentry.h> #include <asm/idtentry.h>
...@@ -29,12 +30,7 @@ static void __init acrn_init_platform(void) ...@@ -29,12 +30,7 @@ static void __init acrn_init_platform(void)
static bool acrn_x2apic_available(void) static bool acrn_x2apic_available(void)
{ {
/* return boot_cpu_has(X86_FEATURE_X2APIC);
* x2apic is not supported for now. Future enablement will have to check
* X86_FEATURE_X2APIC to determine whether x2apic is supported in the
* guest.
*/
return false;
} }
static void (*acrn_intr_handler)(void); static void (*acrn_intr_handler)(void);
......
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