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KVM: arm64: Symbolize the nVHE HYP addresses

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Reintroduce the __kvm_nvhe_ symbols in kallsyms, ignoring the local
symbols in this namespace. The local symbols are not informative and
can cause aliasing issues when symbolizing the addresses.

With the necessary symbols now in kallsyms we can symbolize nVHE
addresses using the %p print format specifier:

[   98.916444][  T426] kvm [426]: nVHE hyp panic at: [<ffffffc0096156fc>] __kvm_nvhe_overflow_stack+0x8/0x34!

Signed-off-by: Kalesh Singh <kaleshsingh@google.com>
Tested-by: Fuad Tabba <tabba@google.com>
Reviewed-by: Fuad Tabba <tabba@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20220420214317.3303360-7-kaleshsingh@google.com
This commit is contained in:
Kalesh Singh 2022-04-20 14:42:57 -07:00 committed by Marc Zyngier
parent 66de19fad9
commit 6ccf9cb557
2 changed files with 7 additions and 9 deletions
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13
arch/arm64/kvm/handle_exit.c
View File

@ -295,13 +295,8 @@ void __noreturn __cold nvhe_hyp_panic_handler(u64 esr, u64 spsr,
u64 elr_in_kimg = __phys_to_kimg(elr_phys);
u64 hyp_offset = elr_in_kimg - kaslr_offset() - elr_virt;
u64 mode = spsr & PSR_MODE_MASK;
u64 panic_addr = elr_virt + hyp_offset;
/*
* The nVHE hyp symbols are not included by kallsyms to avoid issues
* with aliasing. That means that the symbols cannot be printed with the
* "%pS" format specifier, so fall back to the vmlinux address if
* there's no better option.
*/
if (mode != PSR_MODE_EL2t && mode != PSR_MODE_EL2h) {
kvm_err("Invalid host exception to nVHE hyp!\n");
} else if (ESR_ELx_EC(esr) == ESR_ELx_EC_BRK64 &&
@ -321,9 +316,11 @@ void __noreturn __cold nvhe_hyp_panic_handler(u64 esr, u64 spsr,
if (file)
kvm_err("nVHE hyp BUG at: %s:%u!\n", file, line);
else
kvm_err("nVHE hyp BUG at: %016llx!\n", elr_virt + hyp_offset);
kvm_err("nVHE hyp BUG at: [<%016llx>] %pB!\n", panic_addr,
(void *)panic_addr);
} else {
kvm_err("nVHE hyp panic at: %016llx!\n", elr_virt + hyp_offset);
kvm_err("nVHE hyp panic at: [<%016llx>] %pB!\n", panic_addr,
(void *)panic_addr);
}
/*

3
scripts/kallsyms.c
View File

@ -111,7 +111,8 @@ static bool is_ignored_symbol(const char *name, char type)
".L", /* local labels, .LBB,.Ltmpxxx,.L__unnamed_xx,.LASANPC, etc. */
"__crc_", /* modversions */
"__efistub_", /* arm64 EFI stub namespace */
"__kvm_nvhe_", /* arm64 non-VHE KVM namespace */
"__kvm_nvhe_$", /* arm64 local symbols in non-VHE KVM namespace */
"__kvm_nvhe_.L", /* arm64 local symbols in non-VHE KVM namespace */
"__AArch64ADRPThunk_", /* arm64 lld */
"__ARMV5PILongThunk_", /* arm lld */
"__ARMV7PILongThunk_",