KVM: arm64: Restore hyp when panicking in guest context

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If the guest context is loaded when a panic is triggered, restore the
hyp context so e.g. the shadow call stack works when hyp_panic() is
called and SP_EL0 is valid when the host's panic() is called.

Use the hyp context's __hyp_running_vcpu field to track when hyp
transitions to and from the guest vcpu so the exception handlers know
whether the context needs to be restored.

Signed-off-by: Andrew Scull <ascull@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20200915104643.2543892-11-ascull@google.com

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Andrew Scull 2020-09-15 11:46:34 +01:00 • committed by Marc Zyngier

parent 7c2e76d87f

commit 7db2153047

5 changed files with 44 additions and 4 deletions

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10

arch/arm64/include/asm/kvm_asm.h

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24

arch/arm64/kvm/hyp/entry.S

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5

arch/arm64/kvm/hyp/hyp-entry.S

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4

arch/arm64/kvm/hyp/include/hyp/switch.h

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5

arch/arm64/kvm/hyp/nvhe/host.S

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