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
..
boot	arm64: dts: ns2: Fixed QSPI compatible string	2020-09-17 13:45:23 +02:00
configs	arm64: defconfig: Re-enable bcm2835-thermal driver	2020-01-27 14:50:10 +01:00
crypto
include	KVM: arm64: Assume write fault on S1PTW permission fault on instruction fetch	2020-10-01 13:14:54 +02:00
kernel	arm64/cpufeature: Drop TraceFilt feature exposure from ID_DFR0 register	2020-10-01 13:14:45 +02:00
kvm	KVM: arm64: Assume write fault on S1PTW permission fault on instruction fetch	2020-10-01 13:14:54 +02:00
lib	arm64: lib: use C string functions with KASAN enabled	2019-12-01 09:17:01 +01:00
mm	arm64: hugetlb: avoid potential NULL dereference	2020-05-14 07:57:21 +02:00
net
xen
Kconfig	arm64: errata: Hide CTR_EL0.DIC on systems affected by Neoverse-N1 #1542419	2020-04-29 16:31:08 +02:00
Kconfig.debug
Kconfig.platforms
Makefile	arm64: makefile fix build of .i file in external module case	2019-12-01 09:17:14 +01:00