• Will Deacon's avatar
    arm64: KVM: Save/restore the host SPE state when entering/leaving a VM · f85279b4
    Will Deacon authored
    The SPE buffer is virtually addressed, using the page tables of the CPU
    MMU. Unusually, this means that the EL0/1 page table may be live whilst
    we're executing at EL2 on non-VHE configurations. When VHE is in use,
    we can use the same property to profile the guest behind its back.
    
    This patch adds the relevant disabling and flushing code to KVM so that
    the host can make use of SPE without corrupting guest memory, and any
    attempts by a guest to use SPE will result in a trap.
    Acked-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
    Cc: Alex Bennée <alex.bennee@linaro.org>
    Cc: Christoffer Dall <christoffer.dall@linaro.org>
    Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
    f85279b4
switch.c 11.4 KB