Zenghui Yu 6276d38cce KVM: arm64: vgic-v3: Drop the reporting of GICR_TYPER.Last for userspace ... commit 23bde34771 upstream. It was recently reported that if GICR_TYPER is accessed before the RD base address is set, we'll suffer from the unset @rdreg dereferencing. Oops... gpa_t last_rdist_typer = rdreg->base + GICR_TYPER + (rdreg->free_index - 1) * KVM_VGIC_V3_REDIST_SIZE; It's "expected" that users will access registers in the redistributor if the RD has been properly configured (e.g., the RD base address is set). But it hasn't yet been covered by the existing documentation. Per discussion on the list [1], the reporting of the GICR_TYPER.Last bit for userspace never actually worked. And it's difficult for us to emulate it correctly given that userspace has the flexibility to access it any time. Let's just drop the reporting of the Last bit for userspace for now (userspace should have full knowledge about it anyway) and it at least prevents kernel from panic ;-) [1] https://lore.kernel.org/kvmarm/c20865a267e44d1e2c0d52ce4e012263@kernel.org/ Fixes: ba7b3f1275 ("KVM: arm/arm64: Revisit Redistributor TYPER last bit computation") Reported-by: Keqian Zhu <zhukeqian1@huawei.com> Signed-off-by: Zenghui Yu <yuzenghui@huawei.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Reviewed-by: Eric Auger <eric.auger@redhat.com> Link: https://lore.kernel.org/r/20201117151629.1738-1-yuzenghui@huawei.com Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2020-12-02 08:49:46 +01:00
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hyp	KVM: arm64: Fix 32bit PC wrap-around	2020-05-14 07:58:26 +02:00
vgic	KVM: arm64: vgic-v3: Drop the reporting of GICR_TYPER.Last for userspace	2020-12-02 08:49:46 +01:00
aarch32.c	KVM: arm64: Synchronize sysreg state on injecting an AArch32 exception	2020-06-17 16:40:38 +02:00
arch_timer.c	KVM: arm64: Treat emulated TVAL TimerValue as a signed 32-bit integer	2020-02-14 16:34:18 -05:00
arm.c	KVM: arm64: Save the host's PtrAuth keys in non-preemptible context	2020-06-17 16:40:38 +02:00
mmio.c	KVM: arm64: Assume write fault on S1PTW permission fault on instruction fetch	2020-10-01 13:18:25 +02:00
mmu.c	KVM: arm64: Force PTE mapping on fault resulting in a device mapping	2020-11-18 19:20:15 +01:00
perf.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234	2019-06-19 17:09:07 +02:00
pmu.c	KVM: arm64: pmu: Fix chained SW_INCR counters	2020-02-14 16:34:17 -05:00
psci.c	KVM: arm64: ARM_SMCCC_ARCH_WORKAROUND_1 doesn't return SMCCC_RET_NOT_REQUIRED	2020-11-18 19:20:21 +01:00
trace.h	KVM: arm/arm64: Fix TRACE_INCLUDE_PATH	2019-02-19 21:05:51 +00:00