9b58c55ba8
[ Upstream commit 05e6295dc7de859c9d56334805485c4d20bebf25 ] The current nested KVM code does not support HPT guests. This is informed/enforced in some ways: - Hosts < P9 will not be able to enable the nested HV feature; - The nested hypervisor MMU capabilities will not contain KVM_CAP_PPC_MMU_HASH_V3; - QEMU reflects the MMU capabilities in the 'ibm,arch-vec-5-platform-support' device-tree property; - The nested guest, at 'prom_parse_mmu_model' ignores the 'disable_radix' kernel command line option if HPT is not supported; - The KVM_PPC_CONFIGURE_V3_MMU ioctl will fail if trying to use HPT. There is, however, still a way to start a HPT guest by using max-compat-cpu=power8 at the QEMU machine options. This leads to the guest being set to use hash after QEMU calls the KVM_PPC_ALLOCATE_HTAB ioctl. With the guest set to hash, the nested hypervisor goes through the entry path that has no knowledge of nesting (kvmppc_run_vcpu) and crashes when it tries to execute an hypervisor-privileged (mtspr HDEC) instruction at __kvmppc_vcore_entry: root@L1:~ $ qemu-system-ppc64 -machine pseries,max-cpu-compat=power8 ... <snip> [ 538.543303] CPU: 83 PID: 25185 Comm: CPU 0/KVM Not tainted 5.9.0-rc4 #1 [ 538.543355] NIP: c00800000753f388 LR: c00800000753f368 CTR: c0000000001e5ec0 [ 538.543417] REGS: c0000013e91e33b0 TRAP: 0700 Not tainted (5.9.0-rc4) [ 538.543470] MSR: 8000000002843033 <SF,VEC,VSX,FP,ME,IR,DR,RI,LE> CR: 22422882 XER: 20040000 [ 538.543546] CFAR: c00800000753f4b0 IRQMASK: 3 GPR00: c0080000075397a0 c0000013e91e3640 c00800000755e600 0000000080000000 GPR04: 0000000000000000 c0000013eab19800 c000001394de0000 00000043a054db72 GPR08: 00000000003b1652 0000000000000000 0000000000000000 c0080000075502e0 GPR12: c0000000001e5ec0 c0000007ffa74200 c0000013eab19800 0000000000000008 GPR16: 0000000000000000 c00000139676c6c0 c000000001d23948 c0000013e91e38b8 GPR20: 0000000000000053 0000000000000000 0000000000000001 0000000000000000 GPR24: 0000000000000001 0000000000000001 0000000000000000 0000000000000001 GPR28: 0000000000000001 0000000000000053 c0000013eab19800 0000000000000001 [ 538.544067] NIP [c00800000753f388] __kvmppc_vcore_entry+0x90/0x104 [kvm_hv] [ 538.544121] LR [c00800000753f368] __kvmppc_vcore_entry+0x70/0x104 [kvm_hv] [ 538.544173] Call Trace: [ 538.544196] [c0000013e91e3640] [c0000013e91e3680] 0xc0000013e91e3680 (unreliable) [ 538.544260] [c0000013e91e3820] [c0080000075397a0] kvmppc_run_core+0xbc8/0x19d0 [kvm_hv] [ 538.544325] [c0000013e91e39e0] [c00800000753d99c] kvmppc_vcpu_run_hv+0x404/0xc00 [kvm_hv] [ 538.544394] [c0000013e91e3ad0] [c0080000072da4fc] kvmppc_vcpu_run+0x34/0x48 [kvm] [ 538.544472] [c0000013e91e3af0] [c0080000072d61b8] kvm_arch_vcpu_ioctl_run+0x310/0x420 [kvm] [ 538.544539] [c0000013e91e3b80] [c0080000072c7450] kvm_vcpu_ioctl+0x298/0x778 [kvm] [ 538.544605] [c0000013e91e3ce0] [c0000000004b8c2c] sys_ioctl+0x1dc/0xc90 [ 538.544662] [c0000013e91e3dc0] [c00000000002f9a4] system_call_exception+0xe4/0x1c0 [ 538.544726] [c0000013e91e3e20] [c00000000000d140] system_call_common+0xf0/0x27c [ 538.544787] Instruction dump: [ 538.544821] f86d1098 60000000 60000000 48000099 e8ad0fe8 e8c500a0 e9264140 75290002 [ 538.544886] 7d1602a6 7cec42a6 40820008 7d0807b4 <7d164ba6> 7d083a14 f90d10a0 480104fd [ 538.544953] ---[ end trace 74423e2b948c2e0c ]--- This patch makes the KVM_PPC_ALLOCATE_HTAB ioctl fail when running in the nested hypervisor, causing QEMU to abort. Reported-by: Satheesh Rajendran <sathnaga@linux.vnet.ibm.com> Signed-off-by: Fabiano Rosas <farosas@linux.ibm.com> Reviewed-by: Greg Kurz <groug@kaod.org> Reviewed-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Paul Mackerras <paulus@ozlabs.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.