[PATCH 5/7] x86/hyperv: Mark ACPI wakeup mailbox page as private
From: Yunhong Jiang <hidden>
Date: 2024-08-06 22:13:06
Also in:
linux-acpi, linux-devicetree, lkml
Subsystem:
the rest, x86 architecture (32-bit and 64-bit) · Maintainers:
Linus Torvalds, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen
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 <redacted> --- 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;
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2.25.1