KVM: arm64: Save/Restore guest DISR_EL1

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If we deliver a virtual SError to the guest, the guest may defer it
with an ESB instruction. The guest reads the deferred value via DISR_EL1,
but the guests view of DISR_EL1 is re-mapped to VDISR_EL2 when HCR_EL2.AMO
is set.

Add the KVM code to save/restore VDISR_EL2, and make it accessible to
userspace as DISR_EL1.

Signed-off-by: James Morse <james.morse@arm.com>
Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

...

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James Morse 2018-01-15 19:39:02 +00:00 • committed by Catalin Marinas

parent 4715c14bc1

commit c773ae2b34

4 changed files with 9 additions and 0 deletions

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arch/arm64/include/asm/kvm_host.h

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arch/arm64/include/asm/sysreg.h

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arch/arm64/kvm/hyp/sysreg-sr.c

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arch/arm64/kvm/sys_regs.c

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