On 10/8/21 5:37 PM, Kuppuswamy Sathyanarayanan wrote:
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 91ba391f9b32..0af19cb1a28c 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -2076,6 +2076,18 @@
1 - Bypass the IOMMU for DMA.
unset - Use value of CONFIG_IOMMU_DEFAULT_PASSTHROUGH.
+ ioremap_force_shared= [X86_64, CCG]
+ Force the kernel to use shared memory mappings which do
+ not use ioremap_host_shared/pcimap_host_shared to opt-in
+ to shared mappings with the host. This feature is mainly
+ used by a confidential guest when enabling new drivers
+ without proper shared memory related changes. Please note
+ that this option might also allow other non explicitly
+ enabled drivers to interact with the host in confidential
+ guest, which could cause other security risks. This option
+ will also cause BIOS data structures to be shared with the
+ host, which might open security holes.
Hi,
This cmdline option text should have a little bit more info. Just as an
example/template:
acpi_apic_instance= [ACPI, IOAPIC]
Format: <int>
2: use 2nd APIC table, if available
1,0: use 1st APIC table
default: 0
So what is expected after the "=" sign?...
thanks.
--
~Randy
