Hi all,
we implemented support for Jailhouse 32 bit inmates running on 64-bit Jailhouse
on the i.MX 8M Mini and it works fine, GIC demo runs without problems. Now I
have one problem, that just occurred. I'm trying to get the ivshmem demo
running in 32 bit and it does work until it comes to the line
asm volatile("wfi" : : : "memory");
When I give the inmate CPUs 1-3 in 32 bit mode and the inmate accesses this
line, the 64 bit inmate CPU 0 crashes. If I comment this line out
//asm volatile("wfi" : : : "memory");
both 64 bit root cell and 32 bit inmate run just fine. Now apparently the 64
bit Jailhouse Hypervisor has a problem with WFI beeing executed by a 32 bit
inmate, as with a 64 bit inmate there is no problem. Is there an explanation
for this behaviour? I guess I will now have to handle the WFI exception. How do
I know the inmate is exiting because of a WFI, all exits I see are these:
#define ESR_EC_SMC64 0x17
#define ESR_EC_SYS64 0x18
#define ESR_EC_DABT_LOW 0x24
In the ARMv8 manual it says, ESR_EL2 has an EC == 0b000001, that traps WFI and
WFE and there is a define
#define HSR_EC_WFI 0x01
but it's not used and it's for AArch32 only. Now I wonder, what's the best way
to handle this?
Best regards,
Jan
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