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  • Marc Zyngier's avatar
    KVM: arm64: Fix debug register indexing · cb853ded
    Marc Zyngier authored
    Commit 03fdfb26 ("KVM: arm64: Don't write junk to sysregs on
    reset") flipped the register number to 0 for all the debug registers
    in the sysreg table, hereby indicating that these registers live
    in a separate shadow structure.
    
    However, the author of this patch failed to realise that all the
    accessors are using that particular index instead of the register
    encoding, resulting in all the registers hitting index 0. Not quite
    a valid implementation of the architecture...
    
    Address the issue by fixing all the accessors to use the CRm field
    of the encoding, which contains the debug register index.
    
    Fixes: 03fdfb26
    
     ("KVM: arm64: Don't write junk to sysregs on reset")
    Reported-by: default avatarRicardo Koller <ricarkol@google.com>
    Signed-off-by: default avatarMarc Zyngier <maz@kernel.org>
    Cc: stable@vger.kernel.org
    cb853ded
sys_regs.c 74.6 KB