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x86_64: Fix memory access size for locore EOI

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Newer QEMU (5.1) hangs / timeouts on a number of tests on x86_64.  In
debugging the issue this is related to a fix in QEMU 5.1 that
validates memory region access.  QEMU has the APIC region only allowing
1 to 4 byte access.  64-bit access is treated as an error.

Change the APIC EOI access in locore.S back to just doing a 32-bit
access.

Fixes #	28453

Signed-off-by: Kumar Gala <kumar.gala@linaro.org>
This commit is contained in:
Kumar Gala 2020-09-16 22:19:39 -05:00 • committed by Maureen Helm
commit 283a057279
1 changed files with 1 additions and 1 deletions
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arch/x86/core/intel64/locore.S
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@ -696,7 +696,7 @@ irq_dispatch:
wrmsr
#else /* xAPIC */
movq z_loapic_regs, %rdx
movq %rax, LOAPIC_EOI(%rdx)
movl %eax, LOAPIC_EOI(%rdx)
#endif /* CONFIG_X2APIC */
movq %gs:__x86_tss64_t_cpu_OFFSET, %rsi