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target/arm: Set SPSR_EL1.M correctly when nested virt is enabled

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FEAT_NV requires that when HCR_EL2.{NV,NV1} == {1,0} and an exception
is taken from EL1 to EL1 then the reported EL in SPSR_EL1.M should be
EL2, not EL1.  Implement this behaviour.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Tested-by: Miguel Luis <miguel.luis@oracle.com>
This commit is contained in:
Peter Maydell 2024-01-09 14:43:49 +00:00
parent b7ecc3da6c
commit 29eda9cd19
1 changed files with 6 additions and 0 deletions
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6
target/arm/helper.c
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@ -11249,6 +11249,12 @@ static void arm_cpu_do_interrupt_aarch64(CPUState *cs)
old_mode = pstate_read(env);
aarch64_save_sp(env, arm_current_el(env));
env->elr_el[new_el] = env->pc;
if (cur_el == 1 && new_el == 1 &&
((arm_hcr_el2_eff(env) & (HCR_NV | HCR_NV1)) == HCR_NV)) {
/* I_ZJRNN: report EL2 in the SPSR by setting M[3:2] to 0b10 */
old_mode = deposit32(old_mode, 2, 2, 2);
}
} else {
old_mode = cpsr_read_for_spsr_elx(env);
env->elr_el[new_el] = env->regs[15];