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| author | Marc Zyngier <marc.zyngier@arm.com> | 2016-06-30 19:40:35 +0200 |
|---|---|---|
| committer | Christoffer Dall <christoffer.dall@linaro.org> | 2016-07-03 23:41:27 +0200 |
| commit | cf7df13d3c7c7f8a475c09ef49a5b72f7cfe3f4b (patch) | |
| tree | 5afc0cf776ae43fc1c614b20f6f1fea3e33b55ce /arch | |
| parent | arm64: KVM: Merged page tables documentation (diff) | |
| download | linux-cf7df13d3c7c7f8a475c09ef49a5b72f7cfe3f4b.tar.xz linux-cf7df13d3c7c7f8a475c09ef49a5b72f7cfe3f4b.zip | |
arm64: KVM: Always reference __hyp_panic_string via its kernel VA
__hyp_panic_string is passed via the HYP panic code to the panic
function, and is being "upgraded" to a kernel address, as it is
referenced by the HYP code (in a PC-relative way).
This is a bit silly, and we'd be better off obtaining the kernel
address and not mess with it at all. This patch implements this
with a tiny bit of asm glue, by forcing the string pointer to be
read from the literal pool.
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm64/kvm/hyp/switch.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/arch/arm64/kvm/hyp/switch.c b/arch/arm64/kvm/hyp/switch.c index 437cfad5e3d8..81f21a2ab968 100644 --- a/arch/arm64/kvm/hyp/switch.c +++ b/arch/arm64/kvm/hyp/switch.c @@ -299,9 +299,16 @@ static const char __hyp_panic_string[] = "HYP panic:\nPS:%08llx PC:%016llx ESR:% static void __hyp_text __hyp_call_panic_nvhe(u64 spsr, u64 elr, u64 par) { - unsigned long str_va = (unsigned long)__hyp_panic_string; + unsigned long str_va; - __hyp_do_panic(hyp_kern_va(str_va), + /* + * Force the panic string to be loaded from the literal pool, + * making sure it is a kernel address and not a PC-relative + * reference. + */ + asm volatile("ldr %0, =__hyp_panic_string" : "=r" (str_va)); + + __hyp_do_panic(str_va, spsr, elr, read_sysreg(esr_el2), read_sysreg_el2(far), read_sysreg(hpfar_el2), par, |