On 2016-09-21 07:46, Jan Kiszka wrote:
> The root cell can't be using HVC dispatching as it can't be running a
> hypervisor prior to Jailhouse. And we can tell our non-root cells to use
> the SMC method for PSCI services.
>
> Signed-off-by: Jan Kiszka <jan.kis...@siemens.com>
> ---
> hypervisor/arch/arm/traps.c | 10 +++-------
> 1 file changed, 3 insertions(+), 7 deletions(-)
>
> diff --git a/hypervisor/arch/arm/traps.c b/hypervisor/arch/arm/traps.c
> index ab5b3a0..4b2cd21 100644
> --- a/hypervisor/arch/arm/traps.c
> +++ b/hypervisor/arch/arm/traps.c
> @@ -264,14 +264,10 @@ static int arch_handle_hvc(struct trap_context *ctx)
> unsigned long *regs = ctx->regs;
> unsigned long code = regs[0];
>
> - if (IS_PSCI_32(code) || IS_PSCI_UBOOT(code)) {
> - regs[0] = psci_dispatch(ctx);
> - } else {
> - regs[0] = hypercall(code, regs[1], regs[2]);
> + regs[0] = hypercall(code, regs[1], regs[2]);
>
> - if (code == JAILHOUSE_HC_DISABLE && regs[0] == 0)
> - arch_shutdown_self(this_cpu_data());
> - }
> + if (code == JAILHOUSE_HC_DISABLE && regs[0] == 0)
> + arch_shutdown_self(this_cpu_data());
>
> return TRAP_HANDLED;
> }
>
I just found this in the AArch64 patches:
"On AArch64 PSCI calls can be issued via SVC64 hypercalls as well,
contrary to AArch32 which uses SVC32 calls only."
What makes that arch different von 32-bit? In both cases, the root cell
only has a primitive hypervisor stub installed prior to enabling
Jailhouse, and that stub does not handle PSCI hypercalls.
Looking at linux/drivers/firmware/psci.c seems to confirm this: it's
shared by both archs.
Jan
--
Siemens AG, Corporate Technology, CT RDA ITP SES-DE
Corporate Competence Center Embedded Linux
--
You received this message because you are subscribed to the Google Groups
"Jailhouse" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to jailhouse-dev+unsubscr...@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.
