yuzu-emu/unicorn
1
0
Fork 0
mirror of https://github.com/yuzu-emu/unicorn.git synced 2024-10-19 23:18:17 +02:00
Code Issues Packages Projects Releases Wiki Activity

target-arm: Don't report presence of EL2 if it doesn't exist

Browse Source 
We already modify the processor feature bits to not report EL3
support to the guest if EL3 isn't enabled for the CPU we're emulating.
Add similar support for not reporting EL2 unless it is enabled.
This is necessary because real world guest code running at EL3
(trusted firmware or bootloaders) will query the ID registers to
determine whether it should start a guest Linux kernel in EL2 or EL3.

Backports commit 3c2f7bb32b4c597925c5c7411307d51f1a56045d from qemu
This commit is contained in:
Peter Maydell 2018-02-19 01:23:19 -05:00 committed by Lioncash
parent 3ea1b2a84c
commit 61a59665d6
No known key found for this signature in database
GPG Key ID: 4E3C3CC1031BA9C7
1 changed files with 9 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
qemu/target-arm/cpu.c
View File

@ -530,6 +530,15 @@ static int arm_cpu_realizefn(struct uc_struct *uc, DeviceState *dev, Error **err
cpu->id_aa64pfr0 &= ~0xf000;
}
if (!arm_feature(env, ARM_FEATURE_EL2)) {
/* Disable the hypervisor feature bits in the processor feature
* registers if we don't have EL2. These are id_pfr1[15:12] and
* id_aa64pfr0_el1[11:8].
*/
cpu->id_aa64pfr0 &= ~0xf00;
cpu->id_pfr1 &= ~0xf000;
}
if (!cpu->has_mpu) {
unset_feature(env, ARM_FEATURE_MPU);
}