[PATCH v3 0/5] Debug info for nVHE hyp panics

From: Andrew Scull <ascull@google.com>
To: kvmarm@lists.cs.columbia.edu
Cc: kernel-team@android.com, maz@kernel.org, catalin.marinas@arm.com,
	will@kernel.org
Subject: [PATCH v3 0/5] Debug info for nVHE hyp panics
Date: Thu, 18 Mar 2021 14:33:06 +0000	[thread overview]
Message-ID: <20210318143311.839894-1-ascull@google.com> (raw)

Panics from arm64's nVHE hyp mode are hard to interpret. This series
adds some more debug info to help with diagnosis.

Using BUG() in nVHE hyp gives a meaningful address to locate invariants
that fail to hold. The host can also look up the bug to provide the file
and line, if the debug configs are enabled. Otherwise a kimg address is
much more useful than a hyp VA since it can be looked up in vmlinux.

Applies on 5.12-rc3.

From v2 (https://lore.kernel.org/r/20210223155759.3495252-1-ascull@google.com/):
 - Rebased
 - An extra little refactor in bug.c for Steve
 - Handling for the randomized offset

From v1 (https://lore.kernel.org/r/20210223094927.766572-1-ascull@google.com/):
 - keeping struct bug details in bug.c
 - using SPSR to distinguish hyp from host
 - inlined __hyp_panic_string

Andrew Scull (5):
  bug: Remove redundant condition check in report_bug
  bug: Factor out a getter for a bug's file line
  bug: Assign values once in bug_get_file_line()
  KVM: arm64: Use BUG and BUG_ON in nVHE hyp
  KVM: arm64: Log source when panicking from nVHE hyp

 arch/arm64/include/asm/kvm_hyp.h        |  1 -
 arch/arm64/include/asm/kvm_mmu.h        |  2 +
 arch/arm64/kernel/image-vars.h          |  3 +-
 arch/arm64/kvm/handle_exit.c            | 45 +++++++++++++++++++++
 arch/arm64/kvm/hyp/include/hyp/switch.h |  2 -
 arch/arm64/kvm/hyp/nvhe/host.S          | 18 ++++-----
 arch/arm64/kvm/hyp/nvhe/hyp-main.c      |  2 +-
 arch/arm64/kvm/hyp/nvhe/hyp-smp.c       |  6 +--
 arch/arm64/kvm/hyp/nvhe/psci-relay.c    |  2 -
 arch/arm64/kvm/hyp/vhe/switch.c         |  4 +-
 include/linux/bug.h                     |  3 ++
 lib/bug.c                               | 54 +++++++++++++------------
 12 files changed, 91 insertions(+), 51 deletions(-)

-- 
2.31.0.rc2.261.g7f71774620-goog

_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm