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hw/arm/boot: Set SCR_EL3.HXEn when booting kernel

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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 FEAT_HCX support this includes:
    - SCR_EL3.HXEn (bit 38) must be initialised to 0b1.

but we forgot to do this when implementing FEAT_HCX, which would mean
that a guest trying to access the HCRX_EL2 register would crash.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20221027140207.413084-3-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2022-11-03 13:10:40 +00:00
parent 2b39abb2d6
commit d7ef5e16a1
1 changed files with 3 additions and 0 deletions
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3
hw/arm/boot.c
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@ -771,6 +771,9 @@ static void do_cpu_reset(void *opaque)
env->cp15.scr_el3 |= SCR_ENTP2;
env->vfp.smcr_el[3] = 0xf;
}
if (cpu_isar_feature(aa64_hcx, cpu)) {
env->cp15.scr_el3 |= SCR_HXEN;
}
/* AArch64 kernels never boot in secure mode */
assert(!info->secure_boot);
/* This hook is only supported for AArch32 currently: