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arm64: rsi: Add automatic arm-cca-guest module loading

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The TSM module provides guest identification and attestation when a
guest runs in CCA realm mode. By creating a dummy platform device,
let's ensure the module is automatically loaded. The udev daemon loads
the TSM module after it receives a device addition event. Once that
happens, it can be used earlier in the boot process to decrypt the
rootfs.

Signed-off-by: Jeremy Linton <jeremy.linton@arm.com>
Reviewed-by: Gavin Shan <gshan@redhat.com>
Reviewed-by: Steven Price <steven.price@arm.com>
Link: https://lore.kernel.org/r/20241220181236.172060-2-jeremy.linton@arm.com
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Jeremy Linton
2024-12-20 12:12:36 -06:00
committed by Will Deacon
parent fac04efc5c
commit a1edec2245
3 changed files with 25 additions and 0 deletions
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8
drivers/virt/coco/arm-cca-guest/arm-cca-guest.c
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@@ -6,6 +6,7 @@
#include <linux/arm-smccc.h>
#include <linux/cc_platform.h>
#include <linux/kernel.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/smp.h>
#include <linux/tsm.h>
@@ -219,6 +220,13 @@ static void __exit arm_cca_guest_exit(void)
}
module_exit(arm_cca_guest_exit);
/* modalias, so userspace can autoload this module when RSI is available */
static const struct platform_device_id arm_cca_match[] __maybe_unused = {
{ RSI_PDEV_NAME, 0},
{ }
};
MODULE_DEVICE_TABLE(platform, arm_cca_match);
MODULE_AUTHOR("Sami Mujawar <sami.mujawar@arm.com>");
MODULE_DESCRIPTION("Arm CCA Guest TSM Driver");
MODULE_LICENSE("GPL");