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KVM: arm64: Prepare non-protected nVHE hypervisor stacktrace

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In non-protected nVHE mode (non-pKVM) the host can directly access
hypervisor memory; and unwinding of the hypervisor stacktrace is
done from EL1 to save on memory for shared buffers.

To unwind the hypervisor stack from EL1 the host needs to know the
starting point for the unwind and information that will allow it to
translate hypervisor stack addresses to the corresponding kernel
addresses. This patch sets up this book keeping. It is made use of
later in the series.

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/20220726073750.3219117-10-kaleshsingh@google.com
This commit is contained in:
Kalesh Singh
2022-07-26 00:37:42 -07:00
committed by Marc Zyngier
parent 573e1e8275
commit 879e5ac7b2
3 changed files with 63 additions and 0 deletions
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16
arch/arm64/include/asm/kvm_asm.h
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@@ -176,6 +176,22 @@ struct kvm_nvhe_init_params {
unsigned long vtcr;
};
/*
* Used by the host in EL1 to dump the nVHE hypervisor backtrace on
* hyp_panic() in non-protected mode.
*
* @stack_base: hyp VA of the hyp_stack base.
* @overflow_stack_base: hyp VA of the hyp_overflow_stack base.
* @fp: hyp FP where the backtrace begins.
* @pc: hyp PC where the backtrace begins.
*/
struct kvm_nvhe_stacktrace_info {
unsigned long stack_base;
unsigned long overflow_stack_base;
unsigned long fp;
unsigned long pc;
};
/* Translate a kernel address @ptr into its equivalent linear mapping */
#define kvm_ksym_ref(ptr) \
({ \