Re: [PATCH v2 03/13] powerpc/prom_init: Add the ESM call to prom_init

Alexey Kardashevskiy [off-list ref] writes:

On 19/07/2019 07:28, Thiago Jung Bauermann wrote:

quoted

Hello Segher,

Thanks for your review and suggestions!

Segher Boessenkool [off-list ref] writes:

quoted

(Sorry to hijack your reply).

On Thu, Jul 18, 2019 at 06:11:48PM +1000, Alexey Kardashevskiy wrote:

quoted

On 13/07/2019 16:00, Thiago Jung Bauermann wrote:

quoted

From: Ram Pai <redacted>
+static int enter_secure_mode(unsigned long kbase, unsigned long fdt)
+{
+	register uint64_t func asm("r3") = UV_ESM;
+	register uint64_t arg1 asm("r4") = (uint64_t)kbase;
+	register uint64_t arg2 asm("r5") = (uint64_t)fdt;

What does UV do with kbase and fdt precisely? Few words in the commit
log will do.

What about this one? :)

Sorry, I don't have an elaborate answer yet. The non-elaborate answer is
that the ultravisor uses the kbase and fdt as part of integrity checking
of the secure guest.

--
Thiago Jung Bauermann
IBM Linux Technology Center