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| author |   Kalesh Singh <kaleshsingh@google.com> | 2022-07-26 00:37:46 -0700 |
|---|---|---|
| committer |   Marc Zyngier <maz@kernel.org> | 2022-07-26 10:50:12 +0100 |
| commit | 6928bcc84bc4bd9a24a1cb1986418c3de76e1d99 (patch) | |
| tree | 998aa50f0f6d9954e2155c5ef20a2b19e46f25c3 /arch/arm64/kvm/hyp/nvhe/stacktrace.c | |
| parent | KVM: arm64: Add PROTECTED_NVHE_STACKTRACE Kconfig (diff) | |
| download | linux-dev-6928bcc84bc4bd9a24a1cb1986418c3de76e1d99.tar.xz linux-dev-6928bcc84bc4bd9a24a1cb1986418c3de76e1d99.zip | |
KVM: arm64: Allocate shared pKVM hyp stacktrace buffers
In protected nVHE mode the host cannot directly access
hypervisor memory, so we will dump the hypervisor stacktrace
to a shared buffer with the host.
The minimum size for the buffer required, assuming the min frame
size of [x29, x30] (2 * sizeof(long)), is half the combined size of
the hypervisor and overflow stacks plus an additional entry to
delimit the end of the stacktrace.
The stacktrace buffers are used later in the series to dump the
nVHE hypervisor stacktrace when using protected-mode.
Signed-off-by: Kalesh Singh <kaleshsingh@google.com>
Reviewed-by: Fuad Tabba <tabba@google.com>
Tested-by: Fuad Tabba <tabba@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20220726073750.3219117-14-kaleshsingh@google.com
Diffstat (limited to 'arch/arm64/kvm/hyp/nvhe/stacktrace.c')
| -rw-r--r-- | arch/arm64/kvm/hyp/nvhe/stacktrace.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/arm64/kvm/hyp/nvhe/stacktrace.c b/arch/arm64/kvm/hyp/nvhe/stacktrace.c index b8a280aa026a..e2edda92a108 100644 --- a/arch/arm64/kvm/hyp/nvhe/stacktrace.c +++ b/arch/arm64/kvm/hyp/nvhe/stacktrace.c @@ -34,6 +34,10 @@ static void hyp_prepare_backtrace(unsigned long fp, unsigned long pc) stacktrace_info->pc = pc; } +#ifdef CONFIG_PROTECTED_NVHE_STACKTRACE +DEFINE_PER_CPU(unsigned long [NVHE_STACKTRACE_SIZE/sizeof(long)], pkvm_stacktrace); +#endif /* CONFIG_PROTECTED_NVHE_STACKTRACE */ + /* * kvm_nvhe_prepare_backtrace - prepare to dump the nVHE backtrace * |