From: Fabian Vogt <[email protected]>
Just like d7ef5e16a17c sets SCR_EL3.HXEn for FEAT_HCX, this commit
handles SCR_EL3.FGTEn for FEAT_FGT:
When we direct boot a kernel on a CPU which emulates EL3, we need to
set up the EL3 system registers as the Linux kernel documentation
specifies:
https://www.kernel.org/doc/Documentation/arm64/booting.rst
> For CPUs with the Fine Grained Traps (FEAT_FGT) extension present:
> - If EL3 is present and the kernel is entered at EL2:
> - SCR_EL3.FGTEn (bit 27) must be initialised to 0b1.
Cc: [email protected]
Signed-off-by: Fabian Vogt <[email protected]>
Message-id: [email protected]
Reviewed-by: Peter Maydell <[email protected]>
Signed-off-by: Peter Maydell <[email protected]>
---
hw/arm/boot.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/hw/arm/boot.c b/hw/arm/boot.c
index 720f22531a6..24fa1690600 100644
--- a/hw/arm/boot.c
+++ b/hw/arm/boot.c
@@ -761,6 +761,10 @@ static void do_cpu_reset(void *opaque)
if (cpu_isar_feature(aa64_hcx, cpu)) {
env->cp15.scr_el3 |= SCR_HXEN;
}
+ if (cpu_isar_feature(aa64_fgt, cpu)) {
+ env->cp15.scr_el3 |= SCR_FGTEN;
+ }
+
/* AArch64 kernels never boot in secure mode */
assert(!info->secure_boot);
/* This hook is only supported for AArch32 currently:
--
2.34.1
