Dave Martin 2955bcc8c3 KVM: arm64: Avoid mistaken attempts to save SVE state for vcpus ... Commit e6b673b ("KVM: arm64: Optimise FPSIMD handling to reduce guest/host thrashing") uses fpsimd_save() to save the FPSIMD state for a vcpu when scheduling the vcpu out. However, currently current's value of TIF_SVE is restored before calling fpsimd_save() which means that fpsimd_save() may erroneously attempt to save SVE state from the vcpu. This enables current's vector state to be polluted with guest data. current->thread.sve_state may be unallocated or not large enough, so this can also trigger a NULL dereference or buffer overrun. Instead of this, TIF_SVE should be configured properly for the guest when calling fpsimd_save() with the vcpu context loaded. This patch ensures this by delaying restoration of current's TIF_SVE until after the call to fpsimd_save(). Fixes: e6b673b741 ("KVM: arm64: Optimise FPSIMD handling to reduce guest/host thrashing") Signed-off-by: Dave Martin <Dave.Martin@arm.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>		2018-06-21 09:14:44 +01:00
..
hyp	Small update for KVM.	2018-06-12 11:34:04 -07:00
debug.c	KVM: arm64: Repurpose vcpu_arch.debug_flags for general-purpose flags	2018-05-25 12:28:13 +01:00
fpsimd.c	KVM: arm64: Avoid mistaken attempts to save SVE state for vcpus	2018-06-21 09:14:44 +01:00
guest.c	arm/arm64: KVM: Add PSCI version selection API	2018-04-20 16:32:23 +01:00
handle_exit.c
hyp-init.S	arm64: KVM: Move vector offsetting from hyp-init.S to kvm_get_hyp_vector	2018-03-19 13:05:37 +00:00
hyp.S
inject_fault.c
irq.h
Kconfig	KVM: arm64: Optimise FPSIMD handling to reduce guest/host thrashing	2018-05-25 12:28:28 +01:00
Makefile	KVM: arm64: Optimise FPSIMD handling to reduce guest/host thrashing	2018-05-25 12:28:28 +01:00
regmap.c
reset.c	arm64: KVM: Add ARCH_WORKAROUND_2 discovery through ARCH_FEATURES_FUNC_ID	2018-05-31 18:00:59 +01:00
sys_regs_generic_v8.c
sys_regs.c	KVM: arm64: Repurpose vcpu_arch.debug_flags for general-purpose flags	2018-05-25 12:28:13 +01:00
sys_regs.h
trace.h
va_layout.c	arm64: KVM: Allow mapping of vectors outside of the RAM region	2018-03-19 13:06:46 +00:00
vgic-sys-reg-v3.c