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target/arm: kvm: Handle misconfigured dabt injection

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Injecting external data abort through KVM might trigger
an issue on kernels that do not get updated to include the KVM fix.
For those and aarch32 guests, the injected abort gets misconfigured
to be an implementation defined exception. This leads to the guest
repeatedly re-running the faulting instruction.

Add support for handling that case.

[
  Fixed-by: 018f22f95e8a
	('KVM: arm: Fix DFSR setting for non-LPAE aarch32 guests')
  Fixed-by: 21aecdbd7f3a
	('KVM: arm: Make inject_abt32() inject an external abort instead')
]

Signed-off-by: Beata Michalska <beata.michalska@linaro.org>
Acked-by: Andrew Jones <drjones@redhat.com>
Message-id: 20200629114110.30723-3-beata.michalska@linaro.org
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Beata Michalska 2020-07-03 16:59:42 +01:00 • committed by Peter Maydell
parent 694bcaa81f
commit 1711bfa5f5
5 changed files with 124 additions and 1 deletions
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10
target/arm/kvm_arm.h
View file

@ -449,6 +449,16 @@ bool kvm_arm_hw_debug_active(CPUState *cs);
struct kvm_guest_debug_arch;
void kvm_arm_copy_hw_debug_data(struct kvm_guest_debug_arch *ptr);
/**
* kvm_arm_verify_ext_dabt_pending:
* @cs: CPUState
*
* Verify the fault status code wrt the Ext DABT injection
*
* Returns: true if the fault status code is as expected, false otherwise
*/
bool kvm_arm_verify_ext_dabt_pending(CPUState *cs);
/**
* its_class_name:
*