Re: [Stratos-dev] Current status of Xen on MachiatoBin

23 Oct 2020

On Thu, 22 Oct 2020, Alex Bennée wrote:
...
Stefano Stabellini stefano.stabellini@xilinx.com writes:
  (XEN) Check compatible for node /a(XEN) Loading d0 initrd from 00000000aefac000 to 0x0000000028200000-0x0000000029eedb66
  (XEN) Loading d0 DTB to 0x0000000028000000-0x0000000028005ed9
  (XEN) Initial low memory virq threshold set at 0x4000 pages.
  (XEN) Scrubbing Free RAM in background
  (XEN) Std. Loglevel: All
  (XEN) Guest Loglevel: All
  (XEN) ***************************************************
  (XEN) PLEASE SPECIFY dom0_mem PARAMETER - USING 512M FOR NOW
  (XEN) ***************************************************
This is a problem, especially if you are booting Debian 512MB are not
going to be enough. It might also be the reason for the hang below.
Try to add something like: dom0_mem=2G to the Xen command line.
...
(XEN) 3... 2... 1... 
  (XEN) *** Serial input to DOM0 (type 'CTRL-a' three times to switch input)
  (XEN) Check compatible for node /chosen/module@b0c9b000
  (XEN) cplen 17
  (XEN) multiboot,module
  (XEN) Check compatible for node /chosen/module@aefac000
  (XEN) cplen 17
  (XEN) multiboot,module
  (XEN) Freed 340kB init memory.
  (XEN) d0v0: vGICD: unhandled word write 0x000000ffffffff to ICACTIVER4
  (XEN) d0v0: vGICD: unhandled word write 0x000000ffffffff to ICACTIVER8
  (XEN) d0v0: vGICD: unhandled word write 0x000000ffffffff to ICACTIVER12
  (XEN) d0v0: vGICD: unhandled word write 0x000000ffffffff to ICACTIVER16
  (XEN) d0v0: vGICD: unhandled word write 0x000000ffffffff to ICACTIVER20
  (XEN) d0v0: vGICD: unhandled word write 0x000000ffffffff to ICACTIVER24
  (XEN) d0v0: vGICD: unhandled word write 0x000000ffffffff to ICACTIVER28
  (XEN) d0v0: vGICD: unhandled word write 0x000000ffffffff to ICACTIVER32
  (XEN) d0v0: vGICD: unhandled word write 0x000000ffffffff to ICACTIVER36
  (XEN) d0v0: vGICD: unhandled word write 0x000000ffffffff to ICACTIVER40
  (XEN) d0v0: vGICD: unhandled word write 0x000000ffffffff to ICACTIVER0
  (XEN) d0v1: vGICD: unhandled word write 0x000000ffffffff to ICACTIVER0
  (XEN) d0v2: vGICD: unhandled word write 0x000000ffffffff to ICACTIVER0
  (XEN) d0v3: vGICD: unhandled word write 0x000000ffffffff to ICACTIVER0
  (XEN) d0v0: vGICD: unhandled word write 0x00000000000001 to ICPENDR8
  (XEN) d0v0: vGICD: unhandled word write 0x00000000000002 to ICPENDR8
  (XEN) d0v0: vGICD: unhandled word write 0x00000000000004 to ICPENDR8
  (XEN) d0v0: vGICD: unhandled word write 0x00000000000008 to ICPENDR8
  (XEN) d0v0: vGICD: unhandled word write 0x00000000000010 to ICPENDR8
  (XEN) d0v0: vGICD: unhandled word write 0x00000000000020 to ICPENDR8
  (XEN) d0v0: vGICD: unhandled word write 0x00000000000040 to ICPENDR8
  (XEN) d0v0: vGICD: unhandled word write 0x00000000000080 to ICPENDR8
  (XEN) physdev.c:16:d0v0 PHYSDEVOP cmd=25: not implemented
  (XEN) physdev.c:16:d0v0 PHYSDEVOP cmd=15: not implemented
  (XEN) physdev.c:16:d0v0 PHYSDEVOP cmd=15: not implemented
  (XEN) d0v0: vGICD: unhandled word write 0x00000000000100 to ICPENDR8
  (XEN) d0v0: vGICD: unhandled word write 0x00000000000200 to ICPENDR8
  (XEN) d0v3: vGICD: unhandled word write 0x00000000000400 to ICPENDR8
  (XEN) d0v0: vGICD: unhandled word write 0x00000000000800 to ICPENDR8
  (XEN) d0v0: vGICD: unhandled word write 0x00000000001000 to ICPENDR8
  (XEN) d0v2: vGICD: unhandled word write 0x00000000002000 to ICPENDR8
  (XEN) d0v2: vGICD: unhandled word write 0x00000000004000 to ICPENDR8
  (XEN) d0v2: vGICD: unhandled word write 0x00000000008000 to ICPENDR8
  (XEN) d0v2: vGICD: unhandled word write 0x00000000010000 to ICPENDR8
  (XEN) d0v2: vGICD: unhandled word write 0x00000000020000 to ICPENDR8
  (XEN) d0v2 Unhandled SMC/HVC: 0x82000001
  (XEN) d0v3: vGICD: unhandled word write 0x00000000040000 to ICPENDR8
  (XEN) d0v3: vGICD: unhandled word write 0x00000000080000 to ICPENDR8
  (XEN) d0v2 Unhandled SMC/HVC: 0x82000002
  (XEN) d0v3: vGICD: unhandled word write 0x00000000100000 to ICPENDR8
  (XEN) d0v2: vGICD: unhandled word write 0x00000000200000 to ICPENDR8
  (XEN) d0v0: vGICD: unhandled word write 0x00000000400000 to ICPENDR8
  (XEN) d0v1: vGICD: unhandled word write 0x00000000800000 to ICPENDR8
  (XEN) d0v1: vGICD: unhandled word write 0x00000001000000 to ICPENDR8
  (XEN) d0v1: vGICD: unhandled word write 0x00000002000000 to ICPENDR8
  (XEN) d0v1: vGICD: unhandled word write 0x00000004000000 to ICPENDR8
  (XEN) d0v1: vGICD: unhandled word write 0x00000008000000 to ICPENDR8
  (XEN) d0v1 Unhandled SMC/HVC: 0x82000001
  (XEN) d0v3 Unhandled SMC/HVC: 0x82000002
  (XEN) d0v3: vGICD: unhandled word write 0x00000010000000 to ICPENDR8
  (XEN) d0v3: vGICD: unhandled word write 0x00000020000000 to ICPENDR8
  (XEN) d0v3: vGICD: unhandled word write 0x00000040000000 to ICPENDR8
  (XEN) d0v3: vGICD: unhandled word write 0x00000080000000 to ICPENDR8
  (XEN) d0v3: vGICD: unhandled word write 0x00000000000001 to ICPENDR12
  (XEN) d0v3 Unhandled SMC/HVC: 0x82000001
  (XEN) d0v1 Unhandled SMC/HVC: 0x82000002
  (XEN) d0v1: vGICD: unhandled word write 0x00000000000002 to ICPENDR12
  (XEN) d0v1: vGICD: unhandled word write 0x00000000000004 to ICPENDR12
  (XEN) d0v1: vGICD: unhandled word write 0x00000000000008 to ICPENDR12
  (XEN) d0v1: vGICD: unhandled word write 0x00000000000010 to ICPENDR12
  (XEN) d0v1: vGICD: unhandled word write 0x00000000000020 to ICPENDR12
  (XEN) d0v1 Unhandled SMC/HVC: 0x82000001
  (XEN) d0v1 Unhandled SMC/HVC: 0x82000002
I suspect the ICPENDR problem is not an issue anymore. We are seeing
another hang, maybe due to the lack of dom0_mem or something else.
The "Unhandled SMC/HVC" messages are interesting: Xen blocks SMC calls
by default. The dom0 kernel here is trying to make two SiP calls, Xen
blocks them and returns "unimplemented". I don't know if it causes any
issues to the kernel but I can imagine that the kernel driver might
refuse to continue. It is typically a firmware driver
(drivers/firmware).
If the two calls are actually required to boot, then Xen should have a
'mediator' driver to filter the calls allowed from the ones that are not
allowed. See for instance xen/arch/arm/platforms/xilinx-zynqmp-eemi.c.
As a test, the appended patch allows all SMC calls for dom0:

diff --git a/xen/arch/arm/vsmc.c b/xen/arch/arm/vsmc.c
index a36db15fff..821c15852a 100644
--- a/xen/arch/arm/vsmc.c
+++ b/xen/arch/arm/vsmc.c
@@ -286,10 +286,32 @@ static bool vsmccc_handle_call(struct cpu_user_regs *regs)
if ( !handled )
     {
-        gprintk(XENLOG_INFO, "Unhandled SMC/HVC: %#x\n", funcid);
+        if ( is_hardware_domain(current->domain) )
+        {
+            struct arm_smccc_res res;
+
+            arm_smccc_1_1_smc(get_user_reg(regs, 0),
+                    get_user_reg(regs, 1),
+                    get_user_reg(regs, 2),
+                    get_user_reg(regs, 3),
+                    get_user_reg(regs, 4),
+                    get_user_reg(regs, 5),
+                    get_user_reg(regs, 6),
+                    get_user_reg(regs, 7),
+                    &res);
+
+            set_user_reg(regs, 0, res.a0);
+            set_user_reg(regs, 1, res.a1);
+            set_user_reg(regs, 2, res.a2);
+            set_user_reg(regs, 3, res.a3);
+        }
+        else
+        {
+            gprintk(XENLOG_INFO, "Unhandled SMC/HVC: %#x\n", funcid);
-        /* Inform caller that function is not supported. */
-        set_user_reg(regs, 0, ARM_SMCCC_ERR_UNKNOWN_FUNCTION);
+            /* Inform caller that function is not supported. */
+            set_user_reg(regs, 0, ARM_SMCCC_ERR_UNKNOWN_FUNCTION);
+        }
     }
return true;

    

2024

2023

2022

2021

2020

Re: [Stratos-dev] Current status of Xen on MachiatoBin