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linux/arch/powerpc/kvm
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Fabiano Rosas 25edcc50d7 KVM: PPC: Book3S HV: Save and restore FSCR in the P9 path 
The Facility Status and Control Register is a privileged SPR that
defines the availability of some features in problem state. Since it
can be written by the guest, we must restore it to the previous host
value after guest exit.

This restoration is currently done by taking the value from
current->thread.fscr, which in the P9 path is not enough anymore
because the guest could context switch the QEMU thread, causing the
guest-current value to be saved into the thread struct.

The above situation manifested when running a QEMU linked against a
libc with System Call Vectored support, which causes scv
instructions to be run by QEMU early during the guest boot (during
SLOF), at which point the FSCR is 0 due to guest entry. After a few
scv calls (1 to a couple hundred), the context switching happens and
the QEMU thread runs with the guest value, resulting in a Facility
Unavailable interrupt.

This patch saves and restores the host value of FSCR in the inner
guest entry loop in a way independent of current->thread.fscr. The old
way of doing it is still kept in place because it works for the old
entry path.

Signed-off-by: Fabiano Rosas <farosas@linux.ibm.com>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
2021-02-10 14:31:08 +11:00
..
book3s.c KVM: PPC: Don't return -ENOTSUPP to userspace in ioctls 2020-09-17 11:38:17 +10:00
book3s.h KVM: PPC: Clean up redundant 'kvm_run' parameters 2020-05-27 11:39:31 +10:00
book3s_32_mmu.c KVM: PPC: Use fallthrough; 2020-03-19 16:39:52 +11:00
book3s_32_mmu_host.c KVM: PPC: Book3S PR: Move kvmppc_mmu_init() into PR KVM 2020-03-19 16:39:52 +11:00
book3s_32_sr.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 266 2019-06-05 17:30:28 +02:00
book3s_64_mmu.c KVM: PPC: Use fallthrough; 2020-03-19 16:39:52 +11:00
book3s_64_mmu_host.c KVM: PPC: Book3S PR: Move kvmppc_mmu_init() into PR KVM 2020-03-19 16:39:52 +11:00
book3s_64_mmu_hv.c KVM: PPC: Book3S HV: Increase KVMPPC_NR_LPIDS on POWER8 and POWER9 2020-07-21 15:38:03 +10:00
book3s_64_mmu_radix.c KVM: PPC: Book3S: Fix symbol undeclared warnings 2020-09-22 11:53:55 +10:00
book3s_64_slb.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 266 2019-06-05 17:30:28 +02:00
book3s_64_vio.c KVM: PPC: Book3S: Fix symbol undeclared warnings 2020-09-22 11:53:55 +10:00
book3s_64_vio_hv.c treewide: Convert macro and uses of __section(foo) to __section("foo") 2020-10-25 14:51:49 -07:00
book3s_emulate.c KVM: PPC: BOOK3S: PR: Ignore UAMOR SPR 2020-12-04 01:01:24 +11:00
book3s_exports.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 266 2019-06-05 17:30:28 +02:00
book3s_hv.c KVM: PPC: Book3S HV: Save and restore FSCR in the P9 path 2021-02-10 14:31:08 +11:00
book3s_hv_builtin.c KVM: PPC: Book3S HV: Remove support for running HPT guest on RPT host without mixed mode support 2021-02-10 14:31:08 +11:00
book3s_hv_hmi.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 114 2019-05-24 17:39:01 +02:00
book3s_hv_interrupts.S KVM: PPC: Book3S HV: Set LPCR[HDICE] before writing HDEC 2020-09-17 11:38:17 +10:00
book3s_hv_nested.c KVM: PPC: Book3S HV: Add infrastructure to support 2nd DAWR 2021-02-10 14:31:08 +11:00
book3s_hv_ras.c KVM: PPC: Book3S HV: Don't attempt to recover machine checks for FWNMI enabled guests 2020-12-04 01:01:23 +11:00
book3s_hv_rm_mmu.c powerpc: Define new SRR1 bits for a ISA v3.1 2020-05-19 00:10:38 +10:00
book3s_hv_rm_xics.c KVM: PPC: Book3S: Fix symbol undeclared warnings 2020-09-22 11:53:55 +10:00
book3s_hv_rm_xive.c mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
book3s_hv_rmhandlers.S KVM: PPC: Book3S HV: Use POWER9 SLBIA IH=6 variant to clear SLB 2021-02-10 14:31:08 +11:00
book3s_hv_tm.c KVM: PPC: Book3S HV: Treat TM-related invalid form instructions on P9 like the valid ones 2020-03-19 16:39:52 +11:00
book3s_hv_tm_builtin.c KVM: PPC: Book3S HV: Treat TM-related invalid form instructions on P9 like the valid ones 2020-03-19 16:39:52 +11:00
book3s_hv_uvmem.c mm/memremap_pages: support multiple ranges per invocation 2020-10-13 18:38:28 -07:00
book3s_interrupts.S PPC KVM update for 5.9 2020-08-09 13:24:02 -04:00
book3s_mmu_hpte.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 266 2019-06-05 17:30:28 +02:00
book3s_paired_singles.c KVM: PPC: Clean up redundant 'kvm_run' parameters 2020-05-27 11:39:31 +10:00
book3s_pr.c powerpc/64s: Remove MSR[ISF] bit 2020-12-09 23:48:14 +11:00
book3s_pr_papr.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
book3s_rmhandlers.S powerpc: Replace RFI by rfi on book3s/32 and booke 2020-11-19 16:56:54 +11:00
book3s_rtas.c KVM: PPC: Protect kvm_vcpu_read_guest with srcu locks 2020-07-21 15:38:03 +10:00
book3s_segment.S powerpc/64s/exception: Move KVM test to common code 2020-04-01 13:42:11 +11:00
book3s_xics.c KVM: PPC: Book3S: Assign boolean values to a bool variable 2020-12-15 22:22:06 +11:00
book3s_xics.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
book3s_xive.c powerpc updates for 5.11 2020-12-17 13:34:25 -08:00
book3s_xive.h KVM: PPC: Book3S HV: XIVE: Add a comment regarding VP numbering 2020-12-11 09:53:11 +11:00
book3s_xive_native.c powerpc/xive: Remove P9 DD1 flag XIVE_IRQ_FLAG_SHIFT_BUG 2020-12-11 09:53:10 +11:00
book3s_xive_template.c powerpc/xive: Remove P9 DD1 flag XIVE_IRQ_FLAG_EOI_FW 2020-12-11 09:53:10 +11:00
booke.c KVM: PPC: remove unneeded semicolon 2021-02-10 14:31:08 +11:00
booke.h KVM: PPC: Clean up redundant 'kvm_run' parameters 2020-05-27 11:39:31 +10:00
booke_emulate.c KVM: PPC: Clean up redundant 'kvm_run' parameters 2020-05-27 11:39:31 +10:00
booke_interrupts.S KVM: PPC: Clean up redundant kvm_run parameters in assembly 2020-07-23 15:50:01 +10:00
bookehv_interrupts.S KVM: PPC: Clean up redundant kvm_run parameters in assembly 2020-07-23 15:50:01 +10:00
e500.c KVM: PPC: Kill kvmppc_ops::mmu_destroy() and kvmppc_mmu_destroy() 2020-03-19 16:43:07 +11:00
e500.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
e500_emulate.c KVM: PPC: Clean up redundant 'kvm_run' parameters 2020-05-27 11:39:31 +10:00
e500_mmu.c KVM: PPC: Kill kvmppc_ops::mmu_destroy() and kvmppc_mmu_destroy() 2020-03-19 16:43:07 +11:00
e500_mmu_host.c KVM: Pass MMU notifier range flags to kvm_unmap_hva_range() 2020-08-21 18:03:47 -04:00
e500_mmu_host.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
e500mc.c KVM: PPC: Kill kvmppc_ops::mmu_destroy() and kvmppc_mmu_destroy() 2020-03-19 16:43:07 +11:00
emulate.c KVM: PPC: Clean up redundant 'kvm_run' parameters 2020-05-27 11:39:31 +10:00
emulate_loadstore.c MIPS: 2020-06-12 11:05:52 -07:00
fpu.S mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
irq.h
Kconfig treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
Makefile KVM: PPC: Book3S HV: Support for running secure guests 2019-11-28 16:30:02 +11:00
mpic.c KVM: Remove unnecessary asm/kvm_host.h includes 2020-03-16 17:57:34 +01:00
powerpc.c KVM: PPC: Book3S HV: Introduce new capability for 2nd DAWR 2021-02-10 14:31:08 +11:00
timing.c powerpc/kvm: no need to check return value of debugfs_create functions 2020-03-04 22:44:25 +11:00
timing.h KVM: Remove unnecessary asm/kvm_host.h includes 2020-03-16 17:57:34 +01:00
tm.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 174 2019-05-30 11:26:41 -07:00
trace.h KVM: PPC: Move and undef TRACE_INCLUDE_PATH/FILE 2018-11-07 23:04:38 +11:00
trace_book3s.h KVM: PPC: Book3S: Simplify external interrupt handling 2018-10-09 16:04:27 +11:00
trace_booke.h KVM: PPC: Move and undef TRACE_INCLUDE_PATH/FILE 2018-11-07 23:04:38 +11:00
trace_hv.h KVM: PPC: Fix typo on H_DISABLE_AND_GET hcall 2020-07-23 17:43:35 +10:00
trace_pr.h KVM: PPC: Move and undef TRACE_INCLUDE_PATH/FILE 2018-11-07 23:04:38 +11:00