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X-OriginatorOrg: xilinx.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 30 Oct 2020 02:03:29.9749 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 57497799-52af-4a52-71da-08d87c77ff60 X-MS-Exchange-CrossTenant-Id: 657af505-d5df-48d0-8300-c31994686c5c X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=657af505-d5df-48d0-8300-c31994686c5c;Ip=[149.199.62.198];Helo=[xsj-pvapexch02.xlnx.xilinx.com] X-MS-Exchange-CrossTenant-AuthSource: CY1NAM02FT026.eop-nam02.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR02MB6621 X-ZohoMail-DKIM: pass (identity @xilinx.onmicrosoft.com) --8323329-1085550638-1604016260=:12247 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Content-ID: MIME-Version: 1.0 + xen-devel and libxl maintainers In short, there is a regression in libxl with the ARM vuart introduced by moving ARM guests to the PVH build. On Thu, 29 Oct 2020, Takahiro Akashi wrote: > On Wed, Oct 28, 2020 at 02:44:16PM -0700, Stefano Stabellini wrote: > > On Wed, 28 Oct 2020, Takahiro Akashi wrote: > > > On Tue, Oct 27, 2020 at 09:02:14AM +0900, Takahiro Akashi wrote: > > > > On Mon, Oct 26, 2020 at 04:37:30PM -0700, Stefano Stabellini wrote: > > > > >=20 > > > > > On Mon, 26 Oct 2020, Takahiro Akashi wrote: > > > > > > Stefano, > > > > > >=20 > > > > > > # I'm afraid that I have=C2=A0already bothered you with a lot o= f questions. > > > > > >=20 > > > > > > When I looked at Xen's vpl011 implementation, I found > > > > > > CR (and LCHR) register is not supported. (trap may cause a data= abort). > > > > > > On the other hand, for example, linux's pl011 driver surely > > > > > > accesses CR (and LCHR) register. > > > > > > So I guess that linux won't be able to use pl011 on a Xen guest= vm > > > > > > if vuart =3D "sbsa_uart". > > > > > >=20 > > > > > > Is this a known issue or do I miss anything? > > > > >=20 > > > > > Linux should definitely be able to use it, and in fact, I am usin= g it > > > > > with Linux in my test environment. > > > > >=20 > > > > > I think the confusion comes from the name "vpl011": it is in fact= not a > > > > > full PL011 UART, but an SBSA UART. > > > >=20 > > > > Yeah, I have noticed it. > > > >=20 > > > > > SBSA UART only implements a subset of > > > > > the PL011 registers. The compatible string is "arm,sbsa-uart", al= so see > > > > > drivers/tty/serial/amba-pl011.c:sbsa_uart_probe. > > > >=20 > > > > Looking closely into the details of implementation, I found > > > > that all the accesses to unimplemented registers, including > > > > CR, are deliberately avoided in sbsa part of linux driver. > > >=20 > > > So I'm now trying to implement "sbsa-uart" driver on U-Boot > > > by modifying the existing pl011 driver. > > > (Please note the current xen'ized U-Boot utilises a para-virtualized > > > console, i.e. with HVM_PARAM_CONSOLE_PFN.) > > >=20 > > > So far my all attempts have failed. > > >=20 > > > There are a couple of problems, and one of them is how we can > > > access vpl011 port (from dom0). > > > What I did is: > > > - modify U-Boot's pl011 driver > > > (I'm sure that the driver correctly handle a vpl011 device > > > with regard of accessing a proper set of registers.) > > > - start U-Boot guest with "vuart=3Dsbsa_uart" by > > > xl create uboot.cfg -c > > >=20 > > > Then I have seen almost nothing on the screen. > > > Digging into vpl011 implementation, I found that all the characters > > > written DR register will be directed to a "backend domain" if a guest > > > vm is launched by xl command. > > > (In case of dom0less, the backend seems to be Xen itself.) > > >=20 > > > As a silly experiment, I modified domain_vpl011_init() to always crea= te > > > a vpl011 device with "backend_in_domain =3D=3D false". > > > Then, I could see more boot messages from U-Boot, but still fails > > > to use the device as a console, I mean, we will lose all the outputs > > > after at some point and won't be able to type any keys (at a command = prompt). > > > (This will be another problem on U-Boot side.) > > >=20 > > > My first question here is how we can configure and connect a console > > > in this case? > > > Should "xl create -c" or "xl console -t vuart" simply work? > >=20 > > "xl create -c" creates a guest and connect to the primary console which > > is the PV console (i.e. HVM_PARAM_CONSOLE_PFN.) >=20 > So in case of vuart, it (console) doesn't work? > (Apparently, "xl create" doesn't take '-t' option.) >=20 > > To connect to the emulated sbsa uart you need to pass -t vuart. So yes, > > "xl console -t vuart domain_name" should get you access to the emulated > > sbsa uart. The sbsa uart can also be exposed to dom0less guests; you get > > their output by using CTRL-AAA to switch to right domU console. > >=20 > > You can add printks to xen/arch/arm/vpl011.c in Xen to see what's > > happening on the Xen side. vpl011.c is the emulator. >=20 > I'm sure that write to "REG_DR" register is caught by Xen. > What I don't understand is > if back_in_domain -> no outputs > if !back_in_domain -> can see outputs >=20 > (As you know, if a guest is created by xl command, back_in_domain > is forcedly set to true.) >=20 > I looked into xenstore and found that "vuart/0/tty" does not exist, > but "console/tty" does. > How can this happen for vuart? > (I clearly specified, vuart =3D "sbsa_uart" in Xen config.) It looks like we have a bug :-( I managed to reproduce the issue. The problem is a race in libxl. tools/libxc/xc_dom_arm.c:alloc_magic_pages is called first, setting dom->vuart_gfn. Then, libxl__build_hvm should be setting state->vuart_gfn to dom->vuart_gfn (like libxl__build_pv does) but it doesn't. --- libxl: set vuart_gfn in libxl__build_hvm Setting vuart_gfn was missed when switching ARM guests to the PVH build. Like libxl__build_pv, libxl__build_hvm should set state->vuart_gfn to dom->vuart_gfn. Signed-off-by: Stefano Stabellini diff --git a/tools/libxl/libxl_dom.c b/tools/libxl/libxl_dom.c index f8661e90d4..36fe8915e7 100644 --- a/tools/libxl/libxl_dom.c +++ b/tools/libxl/libxl_dom.c @@ -1184,6 +1184,7 @@ int libxl__build_hvm(libxl__gc *gc, uint32_t domid, LOG(ERROR, "hvm build set params failed"); goto out; } + state->vuart_gfn =3D dom->vuart_gfn; =20 rc =3D hvm_build_set_xs_values(gc, domid, dom, info); if (rc !=3D 0) { --8323329-1085550638-1604016260=:12247--