[Bug 284896] CURRENT fails to boot on azure arm64 Dpdsv6 due to BIT Guarded Page flag being set

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=284896

            Bug ID: 284896
           Summary: CURRENT fails to boot on azure arm64 Dpdsv6 due to BIT
                    Guarded Page flag being set
           Product: Base System
           Version: 15.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: arm
          Assignee: freebsd-arm@FreeBSD.org
          Reporter: freebsd@dev.thsi.be

Hi,

The following commit prevents to boot on arm64 "Dpdsv6" azure VM:
https://cgit.freebsd.org/src/commit/?id=1b9096cd1d2fce1edb7077aebd3512cc61c54371

There isn't much error message that can be provided as the serial output is not
working under this regresssion and the efi console does not seem to get
initialized yet (the only output being visible is the one of the efi
bootloader).

Steps to reproduce: deploy the official 14.2 image on an azure arm64 vm, then
update to current.

Applying the following band-aid allows HEAD to boot again on said platform:

index 5a3dbbf00203..9461e9ca1475 100644
--- a/sys/arm64/arm64/pmap.c
+++ b/sys/arm64/arm64/pmap.c
@@ -181,7 +181,7 @@
 #define        pmap_l1_pindex(v)       (NUL2E + ((v) >> L1_SHIFT))
 #define        pmap_l2_pindex(v)       ((v) >> L2_SHIFT)

-#ifdef __ARM_FEATURE_BTI_DEFAULT
+#if 0
 #define        ATTR_KERN_GP            ATTR_S1_GP
 #else
 #define        ATTR_KERN_GP            0

Best regards,

Benjamin

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