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target/arm: allow writes to SCR_EL3.HXEn bit when FEAT_HCX is enabled 

ARM trusted firmware, when built with FEAT_HCX support, sets SCR_EL3.HXEn bit
to allow EL2 to modify HCRX_EL2 register without trapping it in EL3. Qemu
uses a valid mask to clear unsupported SCR_EL3 bits when emulating SCR_EL3
write, and that mask doesn't include SCR_EL3.HXEn bit even if FEAT_HCX is
enabled and exposed to the guest. As a result EL3 writes of that bit are
ignored.

Cc: qemu-stable@nongnu.org
Signed-off-by: Evgeny Iakovlev <eiakovlev@linux.microsoft.com>
Message-id: 20230105221251.17896-4-eiakovlev@linux.microsoft.com
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Evgeny Iakovlev 2023-01-05 23:12:51 +01:00 committed by Peter Maydell
parent 543d022671
commit 08899b5c68
1 changed files with 3 additions and 0 deletions
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3
target/arm/helper.c
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@ -1866,6 +1866,9 @@ static void scr_write(CPUARMState *env, const ARMCPRegInfo *ri, uint64_t value)
if (cpu_isar_feature(aa64_sme, cpu)) {
valid_mask |= SCR_ENTP2;
}
if (cpu_isar_feature(aa64_hcx, cpu)) {
valid_mask |= SCR_HXEN;
}
} else {
valid_mask &= ~(SCR_RW | SCR_ST);
if (cpu_isar_feature(aa32_ras, cpu)) {