Marc Zyngier 1fa2c32e37 KVM: arm64: Assume write fault on S1PTW permission fault on instruction fetch ... commit c4ad98e4b72cb5be30ea282fce935248f2300e62 upstream. KVM currently assumes that an instruction abort can never be a write. This is in general true, except when the abort is triggered by a S1PTW on instruction fetch that tries to update the S1 page tables (to set AF, for example). This can happen if the page tables have been paged out and brought back in without seeing a direct write to them (they are thus marked read only), and the fault handling code will make the PT executable(!) instead of writable. The guest gets stuck forever. In these conditions, the permission fault must be considered as a write so that the Stage-1 update can take place. This is essentially the I-side equivalent of the problem fixed by 60e21a0ef5 ("arm64: KVM: Take S1 walks into account when determining S2 write faults"). Update kvm_is_write_fault() to return true on IABT+S1PTW, and introduce kvm_vcpu_trap_is_exec_fault() that only return true when no faulting on a S1 fault. Additionally, kvm_vcpu_dabt_iss1tw() is renamed to kvm_vcpu_abt_iss1tw(), as the above makes it plain that it isn't specific to data abort. Signed-off-by: Marc Zyngier <maz@kernel.org> Reviewed-by: Will Deacon <will@kernel.org> Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20200915104218.1284701-2-maz@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2020-10-01 13:14:54 +02:00
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arm	KVM: arm64: Assume write fault on S1PTW permission fault on instruction fetch	2020-10-01 13:14:54 +02:00
async_pf.c	KVM: x86: Use gpa_t for cr2/gpa to fix TDP support on 32-bit KVM	2020-02-11 04:34:17 -08:00
async_pf.h
coalesced_mmio.c	KVM: coalesced_mmio: add bounds checking	2019-09-21 07:16:44 +02:00
coalesced_mmio.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
eventfd.c	kvm: Check irqchip mode before assign irqfd	2019-09-16 08:22:15 +02:00
irqchip.c	KVM: fix spectrev1 gadgets	2019-05-16 19:41:22 +02:00
Kconfig	KVM: arm64: Prevent KVM_COMPAT from being selected	2018-06-21 17:17:50 +01:00
kvm_main.c	KVM: fix overflow of zero page refcount with ksm running	2020-10-01 13:14:32 +02:00
vfio.c	vfio: New external user group/file match	2017-06-28 13:50:05 -06:00
vfio.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00