diff options
| author | Kalesh Singh <kaleshsingh@google.com> | 2022-07-26 10:37:50 +0300 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2022-07-26 12:51:39 +0300 |
| commit | 3a7e1b55aad45c0cf86bd4e2f212bb9a61905142 (patch) | |
| tree | 3cd86e2a66f66d338d38846f8af3aa08e1dbb19c /arch/arm64 | |
| parent | 75e9459e48d4867caf549e388bd4faabe1dbcbd3 (diff) | |
| download | linux-3a7e1b55aad45c0cf86bd4e2f212bb9a61905142.tar.xz | |
KVM: arm64: Introduce pkvm_dump_backtrace()
Dumps the pKVM hypervisor backtrace from EL1 by reading the unwinded
addresses from the shared stacktrace buffer.
The nVHE hyp backtrace is dumped on hyp_panic(), before panicking the
host.
[ 111.623091] kvm [367]: nVHE call trace:
[ 111.623215] kvm [367]: [<ffff8000090a6570>] __kvm_nvhe_hyp_panic+0xac/0xf8
[ 111.623448] kvm [367]: [<ffff8000090a65cc>] __kvm_nvhe_hyp_panic_bad_stack+0x10/0x10
[ 111.623642] kvm [367]: [<ffff8000090a61e4>] __kvm_nvhe_recursive_death+0x24/0x34
. . .
[ 111.640366] kvm [367]: [<ffff8000090a61e4>] __kvm_nvhe_recursive_death+0x24/0x34
[ 111.640467] kvm [367]: [<ffff8000090a61e4>] __kvm_nvhe_recursive_death+0x24/0x34
[ 111.640574] kvm [367]: [<ffff8000090a5de4>] __kvm_nvhe___kvm_vcpu_run+0x30/0x40c
[ 111.640676] kvm [367]: [<ffff8000090a8b64>] __kvm_nvhe_handle___kvm_vcpu_run+0x30/0x48
[ 111.640778] kvm [367]: [<ffff8000090a88b8>] __kvm_nvhe_handle_trap+0xc4/0x128
[ 111.640880] kvm [367]: [<ffff8000090a7864>] __kvm_nvhe___host_exit+0x64/0x64
[ 111.640996] kvm [367]: ---[ end nVHE call trace ]---
Signed-off-by: Kalesh Singh <kaleshsingh@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20220726073750.3219117-18-kaleshsingh@google.com
Diffstat (limited to 'arch/arm64')
| -rw-r--r-- | arch/arm64/kvm/handle_exit.c | 35 |
1 files changed, 34 insertions, 1 deletions
diff --git a/arch/arm64/kvm/handle_exit.c b/arch/arm64/kvm/handle_exit.c index e83e6f735100..c14fc4ba4422 100644 --- a/arch/arm64/kvm/handle_exit.c +++ b/arch/arm64/kvm/handle_exit.c @@ -371,6 +371,39 @@ static void hyp_dump_backtrace(unsigned long hyp_offset) kvm_nvhe_dump_backtrace_end(); } +#ifdef CONFIG_PROTECTED_NVHE_STACKTRACE +DECLARE_KVM_NVHE_PER_CPU(unsigned long [NVHE_STACKTRACE_SIZE/sizeof(long)], + pkvm_stacktrace); + +/* + * pkvm_dump_backtrace - Dump the protected nVHE HYP backtrace. + * + * @hyp_offset: hypervisor offset, used for address translation. + * + * Dumping of the pKVM HYP backtrace is done by reading the + * stack addresses from the shared stacktrace buffer, since the + * host cannot directly access hypervisor memory in protected + * mode. + */ +static void pkvm_dump_backtrace(unsigned long hyp_offset) +{ + unsigned long *stacktrace + = (unsigned long *) this_cpu_ptr_nvhe_sym(pkvm_stacktrace); + int i, size = NVHE_STACKTRACE_SIZE / sizeof(long); + + kvm_nvhe_dump_backtrace_start(); + /* The saved stacktrace is terminated by a null entry */ + for (i = 0; i < size && stacktrace[i]; i++) + kvm_nvhe_dump_backtrace_entry((void *)hyp_offset, stacktrace[i]); + kvm_nvhe_dump_backtrace_end(); +} +#else /* !CONFIG_PROTECTED_NVHE_STACKTRACE */ +static void pkvm_dump_backtrace(unsigned long hyp_offset) +{ + kvm_err("Cannot dump pKVM nVHE stacktrace: !CONFIG_PROTECTED_NVHE_STACKTRACE\n"); +} +#endif /* CONFIG_PROTECTED_NVHE_STACKTRACE */ + /* * kvm_nvhe_dump_backtrace - Dump KVM nVHE hypervisor backtrace. * @@ -379,7 +412,7 @@ static void hyp_dump_backtrace(unsigned long hyp_offset) static void kvm_nvhe_dump_backtrace(unsigned long hyp_offset) { if (is_protected_kvm_enabled()) - return; + pkvm_dump_backtrace(hyp_offset); else hyp_dump_backtrace(hyp_offset); } |