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
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boot	ARM: SoC: late updates	2018-06-11 18:19:45 -07:00
configs	ARM: SoC platform updates	2018-06-11 17:49:09 -07:00
crypto	crypto: clarify licensing of OpenSSL asm code	2018-05-31 00:13:44 +08:00
include	KVM: arm64/sve: Fix SVE trap restoration for non-current tasks	2018-06-21 09:14:44 +01:00
kernel	Kbuild: rename CC_STACKPROTECTOR[_STRONG] config variables	2018-06-14 12:21:18 +09:00
kvm	KVM: arm64: Avoid mistaken attempts to save SVE state for vcpus	2018-06-21 09:14:44 +01:00
lib	arm64: export tishift functions to modules	2018-05-21 19:00:48 +01:00
mm	treewide: use PHYS_ADDR_MAX to avoid type casting ULLONG_MAX	2018-06-15 07:55:25 +09:00
net	bpf, arm64: save 4 bytes in prologue when ebpf insns came from cbpf	2018-05-14 19:11:45 -07:00
xen	arm64: mm: Add additional parameter to uaccess_ttbr0_disable	2018-01-17 13:57:49 +01:00
Kconfig	Kbuild: rename HAVE_CC_STACKPROTECTOR config variable	2018-06-15 07:15:28 +09:00
Kconfig.debug	arm64: relocation testing module	2017-04-04 17:03:32 +01:00
Kconfig.platforms	arm64: dts: renesas: Add Renesas R8A77990 Kconfig support	2018-05-16 10:44:01 +02:00
Makefile	arm64: move GCC version check for ARCH_SUPPORTS_INT128 to Kconfig	2018-06-08 18:56:02 +09:00