The ACPI wakeup mailbox is accessed by the OS and the firmware, both are
in the guest's context, instead of the hypervisor/VMM context. Mark the
address private explicitly.
Signed-off-by: Yunhong Jiang <yunhong.jiang@xxxxxxxxxxxxxxx>
---
arch/x86/hyperv/hv_vtl.c | 20 ++++++++++++++++++--
1 file changed, 18 insertions(+), 2 deletions(-)
diff --git a/arch/x86/hyperv/hv_vtl.c b/arch/x86/hyperv/hv_vtl.c
index 04775346369c..bfe54afcdf1d 100644
--- a/arch/x86/hyperv/hv_vtl.c
+++ b/arch/x86/hyperv/hv_vtl.c
@@ -22,12 +22,28 @@ static bool __init hv_vtl_msi_ext_dest_id(void)
return true;
}
+/*
+ * The ACPI wakeup mailbox are accessed by the OS and the BIOS, both are in the
+ * guest's context, instead of the hypervisor/VMM context.
+ */
+static bool hv_is_private_mmio_tdx(u64 addr)
+{
+ if (wakeup_mailbox_addr && (addr >= wakeup_mailbox_addr &&
+ addr < (wakeup_mailbox_addr + PAGE_SIZE)))
+ return true;
+ return false;
+}
+
void __init hv_vtl_init_platform(void)
{
pr_info("Linux runs in Hyper-V Virtual Trust Level\n");
- x86_platform.realmode_reserve = x86_init_noop;
- x86_platform.realmode_init = x86_init_noop;
+ if (wakeup_mailbox_addr) {
+ x86_platform.hyper.is_private_mmio = hv_is_private_mmio_tdx;
+ } else {
+ x86_platform.realmode_reserve = x86_init_noop;
+ x86_platform.realmode_init = x86_init_noop;
+ }
x86_init.irqs.pre_vector_init = x86_init_noop;
x86_init.timers.timer_init = x86_init_noop;
--
2.25.1
