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arm64: KVM: Always reference __hyp_panic_string via its kernel VA

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__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>
This commit is contained in:
Marc Zyngier 2016-06-30 18:40:35 +01:00 committed by Christoffer Dall
parent 82a81bff90
commit cf7df13d3c
1 changed files with 9 additions and 2 deletions
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11
arch/arm64/kvm/hyp/switch.c
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@ -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,