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| author | Kalesh Singh <kaleshsingh@google.com> | 2022-07-26 10:37:44 +0300 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2022-07-26 12:49:50 +0300 |
| commit | 314a61dc31845c233e47c53db3fe6f34284034f4 (patch) | |
| tree | e2b4a07b6297bcff223e1d983addfc83fa00ebc8 /arch/arm64/include/asm/stacktrace | |
| parent | db129d486ebdf4e3168282236f9d9008b42cac7e (diff) | |
| download | linux-314a61dc31845c233e47c53db3fe6f34284034f4.tar.xz | |
KVM: arm64: Introduce hyp_dump_backtrace()
In non-protected nVHE mode, unwinds and dumps the hypervisor backtrace
from EL1. This is possible beacause the host can directly access the
hypervisor stack pages in non-protected mode.
The nVHE backtrace is dumped on hyp_panic(), before panicking the host.
[ 101.498183] kvm [377]: nVHE call trace:
[ 101.498363] kvm [377]: [<ffff8000090a6570>] __kvm_nvhe_hyp_panic+0xac/0xf8
[ 101.499045] kvm [377]: [<ffff8000090a65cc>] __kvm_nvhe_hyp_panic_bad_stack+0x10/0x10
[ 101.499498] kvm [377]: [<ffff8000090a61e4>] __kvm_nvhe_recursive_death+0x24/0x34
. . .
[ 101.524929] kvm [377]: [<ffff8000090a61e4>] __kvm_nvhe_recursive_death+0x24/0x34
[ 101.525062] kvm [377]: [<ffff8000090a61e4>] __kvm_nvhe_recursive_death+0x24/0x34
[ 101.525195] kvm [377]: [<ffff8000090a5de4>] __kvm_nvhe___kvm_vcpu_run+0x30/0x40c
[ 101.525333] kvm [377]: [<ffff8000090a8b64>] __kvm_nvhe_handle___kvm_vcpu_run+0x30/0x48
[ 101.525468] kvm [377]: [<ffff8000090a88b8>] __kvm_nvhe_handle_trap+0xc4/0x128
[ 101.525602] kvm [377]: [<ffff8000090a7864>] __kvm_nvhe___host_exit+0x64/0x64
[ 101.525745] kvm [377]: ---[ 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/20220726073750.3219117-12-kaleshsingh@google.com
Diffstat (limited to 'arch/arm64/include/asm/stacktrace')
| -rw-r--r-- | arch/arm64/include/asm/stacktrace/nvhe.h | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/stacktrace/nvhe.h b/arch/arm64/include/asm/stacktrace/nvhe.h index 21082fd4a0b7..170fe7459f7c 100644 --- a/arch/arm64/include/asm/stacktrace/nvhe.h +++ b/arch/arm64/include/asm/stacktrace/nvhe.h @@ -16,6 +16,23 @@ #include <asm/stacktrace/common.h> +/* + * kvm_nvhe_unwind_init - Start an unwind from the given nVHE HYP fp and pc + * + * @state : unwind_state to initialize + * @fp : frame pointer at which to start the unwinding. + * @pc : program counter at which to start the unwinding. + */ +static inline void kvm_nvhe_unwind_init(struct unwind_state *state, + unsigned long fp, + unsigned long pc) +{ + unwind_init_common(state, NULL); + + state->fp = fp; + state->pc = pc; +} + static inline bool on_hyp_stack(unsigned long sp, unsigned long size, struct stack_info *info); |