[PATCH 4/4] KVM: arm64: Unwind and dump nVHE hypervisor stacktrace

[Mark Brown]

On Wed, Apr 27, 2022 at 11:46:59AM -0700, Kalesh Singh wrote:
> On hyp_panic(), the hypervisor dumps the addresses for its stacktrace
> entries to a page shared with the host. The host then symbolizes and
> prints the hyp stacktrace before panicking itself.
> 
> Example stacktrace:
> 
> [  122.051187] kvm [380]: Invalid host exception to nVHE hyp!
> [  122.052467] kvm [380]: nVHE HYP call trace:
> [  122.052814] kvm [380]: [<ffff800008f5b550>] __kvm_nvhe___pkvm_vcpu_init_traps+0x1f0/0x1f0
> [  122.053865] kvm [380]: [<ffff800008f560f0>] __kvm_nvhe_hyp_panic+0x130/0x1c0
> [  122.054367] kvm [380]: [<ffff800008f56190>] __kvm_nvhe___kvm_vcpu_run+0x10/0x10
> [  122.054878] kvm [380]: [<ffff800008f57a40>] __kvm_nvhe_handle___kvm_vcpu_run+0x30/0x50
> [  122.055412] kvm [380]: [<ffff800008f57d2c>] __kvm_nvhe_handle_trap+0xbc/0x160
> [  122.055911] kvm [380]: [<ffff800008f56864>] __kvm_nvhe___host_exit+0x64/0x64
> [  122.056417] kvm [380]: ---- end of nVHE HYP call trace ----

This will be really helpful!

Reviewed-by: Mark Brown <broonie at kernel.org>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 488 bytes
Desc: not available
URL: <http://lists.infradead.org/pipermail/linux-arm-kernel/attachments/20220429/6dbb5c14/attachment.sig>