Hi Konrad,
On 19/09/2016 16:33, Konrad Rzeszutek Wilk wrote:
void arch_livepatch_revive(void)
{
+/*
+ * Nuke the instruction cache. Data cache has been cleaned before in
+ * arch_livepatch_apply_jmp.
I think you forgot to clean text region from the payload. Without that, you
>
> > void arch_livepatch_revive(void)
> > {
> > +/*
> > + * Nuke the instruction cache. Data cache has been cleaned before in
> > + * arch_livepatch_apply_jmp.
>
> I think you forgot to clean text region from the payload. Without that, you
> may receive a crash if you have a
Hi Konrad,
On 16/09/2016 18:38, Konrad Rzeszutek Wilk wrote:
diff --git a/xen/arch/arm/arm64/livepatch.c b/xen/arch/arm/arm64/livepatch.c
new file mode 100644
index 000..49eb69b
--- /dev/null
+++ b/xen/arch/arm/arm64/livepatch.c
[...]
+int arch_livepatch_perform_rela(struct
As compared to x86 the va of the hypervisor .text
is locked down - we cannot modify the running pagetables
to have the .ro flag unset. We borrow the same idea that
alternative patching has - which is to vmap the entire
.text region and use the alternative virtual address
for patching.
Since we
