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hw/arm/boot: set CPTR_EL3.ESM and SCR_EL3.EnTP2 when booting Linux with EL3 

According to the Linux kernel booting.rst [1], CPTR_EL3.ESM and
SCR_EL3.EnTP2 must be initialized to 1 when EL3 is present and FEAT_SME
is advertised. This has to be taken care of when QEMU boots directly
into the kernel (i.e., "-M virt,secure=on -cpu max -kernel Image").

Cc: qemu-stable@nongnu.org
Fixes: 78cb977666 ("target/arm: Enable SME for -cpu max")
Link: [1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/arm64/booting.rst?h=v6.0#n321
Signed-off-by: Jerome Forissier <jerome.forissier@linaro.org>
Message-id: 20221003145641.1921467-1-jerome.forissier@linaro.org
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Jerome Forissier 2022-10-03 16:56:41 +02:00 committed by Peter Maydell
parent 7fa7ea8f48
commit 0ff993193f
1 changed files with 4 additions and 0 deletions
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4
hw/arm/boot.c
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@ -763,6 +763,10 @@ static void do_cpu_reset(void *opaque)
if (cpu_isar_feature(aa64_sve, cpu)) {
env->cp15.cptr_el[3] |= R_CPTR_EL3_EZ_MASK;
}
if (cpu_isar_feature(aa64_sme, cpu)) {
env->cp15.cptr_el[3] |= R_CPTR_EL3_ESM_MASK;
env->cp15.scr_el3 |= SCR_ENTP2;
}
/* AArch64 kernels never boot in secure mode */
assert(!info->secure_boot);
/* This hook is only supported for AArch32 currently: