Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Date:   Fri, 29 Apr 2022 14:24:38 +0100
From:   Mark Brown <broonie@kernel.org>
To:     Kalesh Singh <kaleshsingh@google.com>
Cc:     mark.rutland@arm.com, will@kernel.org, maz@kernel.org,
        qperret@google.com, tabba@google.com, surenb@google.com,
        kernel-team@android.com, James Morse <james.morse@arm.com>,
        Alexandru Elisei <alexandru.elisei@arm.com>,
        Suzuki K Poulose <suzuki.poulose@arm.com>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Masami Hiramatsu <mhiramat@kernel.org>,
        Peter Collingbourne <pcc@google.com>,
        Alexei Starovoitov <ast@kernel.org>,
        "Madhavan T. Venkataraman" <madvenka@linux.microsoft.com>,
        Andrew Jones <drjones@redhat.com>,
        Marco Elver <elver@google.com>,
        Kefeng Wang <wangkefeng.wang@huawei.com>,
        Zenghui Yu <yuzenghui@huawei.com>,
        Keir Fraser <keirf@google.com>,
        linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH 4/4] KVM: arm64: Unwind and dump nVHE hypervisor
 stacktrace
Message-ID: <YmvnFuAIBjQxQfqM@sirena.org.uk>
References: <20220427184716.1949239-1-kaleshsingh@google.com>
 <20220427184716.1949239-5-kaleshsingh@google.com>
MIME-Version: 1.0
Content-Type: multipart/signed; micalg=pgp-sha512;
        protocol="application/pgp-signature"; boundary="KmavymclFYg5AbyJ"
Content-Disposition: inline
In-Reply-To: <20220427184716.1949239-5-kaleshsingh@google.com>
Precedence: bulk


--KmavymclFYg5AbyJ
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
Content-Transfer-Encoding: quoted-printable

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.
>=20
> Example stacktrace:
>=20
> [  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_ini=
t_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_vc=
pu_run+0x30/0x50
> [  122.055412] kvm [380]: [<ffff800008f57d2c>] __kvm_nvhe_handle_trap+0xb=
c/0x160
> [  122.055911] kvm [380]: [<ffff800008f56864>] __kvm_nvhe___host_exit+0x6=
4/0x64
> [  122.056417] kvm [380]: ---- end of nVHE HYP call trace ----

This will be really helpful!

Reviewed-by: Mark Brown <broonie@kernel.org>

--KmavymclFYg5AbyJ
Content-Type: application/pgp-signature; name="signature.asc"

-----BEGIN PGP SIGNATURE-----

iQEzBAABCgAdFiEEreZoqmdXGLWf4p/qJNaLcl1Uh9AFAmJr5xYACgkQJNaLcl1U
h9AKIwf+L8bCCODKWgL1wYrEellpME7cjpfW7uY6BxNZBEZJ6V+CuQxbHx7shY1D
qc/lcT1/R3JS7INc3mLr0Nw1K5UxC3jHXujCFw0LezQtuC5243YayR1J+v20WtHu
dia7rJkm6qSPMBbfkJ0IFAn2jCioXZJjeEUld6Q601dktI5CgD0P3gWdm7SoZ/SB
ORt2nNPMVhH571i+HBAeVN5lkk5Y7d8XnlNkqGsnhDiMhZPkg1qrgvcFivsu9HOW
ub+n9WLPOLK0PrZhttDvYnOCiUhNsFI6k3wfujbF0ulDN7GO7giLr6z9dVTq+HFg
G4mI/GfeiPZigTdZ3Uz6dGuiirqvTg==
=x5xf
-----END PGP SIGNATURE-----

--KmavymclFYg5AbyJ--