On Tue, 22 Jun 2021 02:33:44 +0000 胤桦 陈 <yinhua_chen@xxxxxxxxxxx> wrote: Hi, > I follow the document https://git.linaro.org/landing-teams/working/arm/arm-reference-platforms.git/about/docs/basefvp/user-guide.rst, sorry for that ;-) > and I build a Linux-on-FVP environment successfully. However, I still cannot boot KVM, the details are as follows: > 1.I make sure that two configuration files enable KVM (I guess these are the right configuration files), they are > layers/meta-arm/meta-arm-bsp/recipes-kernel/linux/files/tc0/defconfig:CONFIG_KVM=y > build-poky/tmp-poky/work-shared/fvp-base/kernel-source/arch/arm64/configs/defconfig:CONFIG_KVM=y > 2.I follow the document https://git.linaro.org/landing-teams/working/arm/arm-reference-platforms.git/about/docs/basefvp/user-guide.rst. After building the whole software stack, I try several commands but the results show that KVM does not work. Have you tried actually running a guest? Using kvmtool, for instance? kvmtool can be statically linked, so you end up with a single executable file, easy to copy into whatever userland you use. If you clone it from git://git.kernel.org/pub/scm/linux/kernel/git/will/kvmtool.git and do "make lkvm-static" on any arm64 system, you can copy the resulting binary "lkvm-static" into your rootfs, and then run it on the model: # lkvm-static run -k <some_kernel_image> You might need to create the device file first (see below). > The screenshots are shown as follows[commands]I try three commands, > "kvm-ok" This does not do much on ARM/arm64, it just merely checks for the existence of /dev/kvm. Depending on your userland, nobody might have created that - but still KVM might be configured fine. A simple "mknod /dev/kvm c 10 232" fixes that, but the test passing now doesn't mean much (as is just checks for the existence of this file, not actual KVM functionality). > "dmesg | grep KVM" Please always use "grep -i" when grep'ing in dmesg, capitalisation of those names may vary. On my kernel there is indeed not a single hit for "KVM", but several for "kvm". Keep in mind that this is not a bullet-proof method: the boot messages from KVM might have been flushed from the dmesg buffer already - on one of my systems running for some weeks with some debug messages they certainly are. But right after boot there is a high chance of success, though, and it's the easiest check for KVM. > "grep -E -o 'vmx|svm' /proc/cpuinfo" This is x86 specific and does not work at all on ARM/arm64. There is not much to learn about KVM in cpuinfo on arm64. > I guess maybe the reason is that FVP configuration uses a KVM-unsupport CPU, but I do not know the right configuration, and the FVP documents do not mention anything about KVM. I doubt that, the normal models should all come with EL2 enabled. The RevC model definitely works. Cheers, Andre > And this is the FVP booting command in the scripts: > > === > > /FVP_Base_RevC-2xAEMv8A > > -C pctl.startup=0.0.0.0 > > -C bp.secure_memory=0 > > -C cluster0.NUM_CORES=1 > > -C cluster1.NUM_CORES=1 > > -C cache_state_modelled=0 > > -C bp.pl011_uart0.untimed_fifos=1 > > -C bp.pl011_uart0.unbuffered_output=1 > > -C bp.pl011_uart0.out_file=uart0-1624328932274439497.log > > -C bp.pl011_uart1.out_file=uart1-1624328932274439497.log > > -C bp.secureflashloader.fname=<workspace>/build-poky/tmp-poky/deploy/images/fvp-base/bl1-fvp.bin > > -C bp.flashloader0.fname=<workspace>/build-poky/tmp-poky/deploy/images/fvp-base/fip-fvp.bin > > -C bp.hostbridge.interfaceName=tap0 > > -C bp.smsc_91c111.enabled=1 > > --data cluster0.cpu0=<workspace>/build-poky/tmp-poky/deploy/images/fvp-base/Image@0x80080000 > > --data cluster0.cpu0=<workspace>/build-poky/tmp-poky/deploy/images/fvp-base/fvp-base-gicv3-psci-custom.dtb@0x83000000 > > -C bp.ve_sysregs.mmbSiteDefault=0 > > -C bp.ve_sysregs.exit_on_shutdown=1 > > -C bp.virtioblockdevice.image_path=<workspace>/build-poky/tmp-poky/deploy/images/fvp-base/core-image-minimal-fvp-base.disk.img > > === > > > > If you can provide any kind of help, I appreciate it very much. > > ________________________________ > From: Andre Przywara <andre.przywara@xxxxxxx> > Sent: Wednesday, April 14, 2021 16:50 > To: 胤桦 陈 <yinhua_chen@xxxxxxxxxxx> > Cc: kvmarm@xxxxxxxxxxxxxxxxxxxxx <kvmarm@xxxxxxxxxxxxxxxxxxxxx> > Subject: Re: KVM/ARM64: Booting KVM on FVP/fastmodels > > On Wed, 14 Apr 2021 02:37:07 +0000 > 胤桦 陈 <yinhua_chen@xxxxxxxxxxx> wrote: > > > Hi, Andre > > > > Do you mean that if I boot Linux on FVP, then I can run KVM on FVP? Since KVM is just a module in Linux? > > Well, on ARM it's not a kernel module, but built-in to the kernel > image, but yes: You can run any normal KVM enabled kernel on > it. So just use the same recipe you would use on any other system to > run KVM guests. > > Cheers, > Andre > > > ________________________________ > > From: André Przywara <andre.przywara@xxxxxxx> > > Sent: Tuesday, March 30, 2021 18:22 > > To: yinhua_chen@xxxxxxxxxxx <yinhua_chen@xxxxxxxxxxx>; kvmarm@xxxxxxxxxxxxxxxxxxxxx <kvmarm@xxxxxxxxxxxxxxxxxxxxx> > > Subject: Re: KVM/ARM64: Booting KVM on FVP/fastmodels > > > > On 29/03/2021 13:13, yinhua_chen@xxxxxxxxxxx wrote: > > > > Hi, > > > > > I want to boot KVM on simulators. > > > > > > I don't want to use QEMU since some features are only supported on > > > FVP/fastmodels now. > > > > > > However, I cannot find documents/blogs/wiki about booting KVM on > > > FVP/fastmodels. > > > > > > Does KVM support running on FVP? > > > > The FVP emulates the full architecture, including all exception levels > > (so also EL2), and the virtualization support of the GIC and the Generic > > Timer. > > So yes, the models fully support KVM (or any other hypervisor, for that > > matter), and are in fact often used for developing KVM support of new > > hardware features. > > > > So what are the problems that you are facing? Just running a kernel like > > you would normally do on the model should work out of the box. > > If you describe your setup and the error messages, we can probably help > > you better. > > > > Cheers, > > Andre > > > > > > > > Appreciate for your help! > > > > > > Sincerely, > > > Yinhua > > > > > > _______________________________________________ > > > kvmarm mailing list > > > kvmarm@xxxxxxxxxxxxxxxxxxxxx > > > https://lists.cs.columbia.edu/mailman/listinfo/kvmarm > > > > > > _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
