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firmware: arm_ffa: Defer probe until pKVM is initialized

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When protected KVM is enabled, the kernel includes a pKVM FF-A proxy
that sits in front of the normal FF-A driver. The proxy has to perform
its own FF-A version negotiation and setup first, so that it can mediate
subsequent FF-A traffic correctly.

Defer FF-A core probing until pKVM has completed initialization. This
keeps the normal driver from negotiating the FF-A version or performing
other transport setup before the pKVM proxy is ready, and lets the
driver model retry probing once the protected KVM state required by the
FF-A transport is available.

Suggested-by: Yeoreum Yun <yeoreum.yun@arm.com>
Reviewed-by: Yeoreum Yun <yeoreum.yun@arm.com>
Link: https://patch.msgid.link/20260508-b4-ffa_plat_dev-v1-4-c5a30f8cf7b8@kernel.org
Signed-off-by: Sudeep Holla <sudeep.holla@kernel.org>
This commit is contained in:
Sudeep Holla 2026-05-08 18:54:18 +01:00
parent 7fe2ec9fb8
commit 3acc80a78e
1 changed files with 6 additions and 0 deletions
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6
drivers/firmware/arm_ffa/driver.c
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@ -43,6 +43,8 @@
#include <linux/uuid.h>
#include <linux/xarray.h>
#include <asm/virt.h>
#include "common.h"
#define FFA_DRIVER_VERSION FFA_VERSION_1_2
@ -2096,6 +2098,10 @@ static int ffa_probe(struct platform_device *pdev)
u32 buf_sz;
size_t rxtx_bufsz = SZ_4K;
if (IS_BUILTIN(CONFIG_ARM_FFA_TRANSPORT) &&
is_protected_kvm_enabled() && !is_pkvm_initialized())
return -EPROBE_DEFER;
ret = ffa_transport_init(&invoke_ffa_fn);
if (ret)
return ret;