mirror of
https://github.com/projectacrn/acrn-hypervisor.git
synced 2026-05-14 18:56:01 +00:00
bfc08c2812
At the time the guest is switching to X2APIC mode, different VCPUs in the same VM could expect the setting of the per VM msr_bitmap differently, which could cause problems. Considering different approaches to address this issue: 1) only guest BSP can update msr_bitmap when switching to X2APIC. 2) carefully re-write the update_msr_bitmap_x2apic_xxx() functions to make sure any bit in the bitmap won't be toggled by the VCPUs. 3) make msr_bitmap as per VCPU. We chose option 3) because it's simple and clean, though it takes more memory than other options. BTW, need to remove const modifier from update_msr_bitmap_x2apic_xxx() functions to get it compiled. Tracked-On: #3166 Signed-off-by: Zide Chen <zide.chen@intel.com> Signed-off-by: Sainath Grandhi <sainath.grandhi@intel.com> Acked-by: Anthony Xu <anthony.xu@intel.com>