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powerpc/64s: handle ISA v3.1 local copy-paste context switches

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The ISA v3.1 the copy-paste facility has a new memory move functionality
which allows the copy buffer to be pasted to domestic memory (RAM) as
opposed to foreign memory (accelerator).

This means the POWER9 trick of avoiding the cp_abort on context switch if
the process had not mapped foreign memory does not work on POWER10. Do the
cp_abort unconditionally there.

KVM must also cp_abort on guest exit to prevent copy buffer state leaking
between contexts.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Acked-by: Paul Mackerras <paulus@ozlabs.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200825075535.224536-1-npiggin@gmail.com
This commit is contained in:
Nicholas Piggin 2020-08-25 17:55:35 +10:00 committed by Michael Ellerman
parent a02f6d4235
commit dc462267d2
3 changed files with 24 additions and 7 deletions
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16
arch/powerpc/kernel/process.c
View File

@ -1250,15 +1250,17 @@ struct task_struct *__switch_to(struct task_struct *prev,
restore_math(current->thread.regs);
/*
* The copy-paste buffer can only store into foreign real
* addresses, so unprivileged processes can not see the
* data or use it in any way unless they have foreign real
* mappings. If the new process has the foreign real address
* mappings, we must issue a cp_abort to clear any state and
* prevent snooping, corruption or a covert channel.
* On POWER9 the copy-paste buffer can only paste into
* foreign real addresses, so unprivileged processes can not
* see the data or use it in any way unless they have
* foreign real mappings. If the new process has the foreign
* real address mappings, we must issue a cp_abort to clear
* any state and prevent snooping, corruption or a covert
* channel. ISA v3.1 supports paste into local memory.
*/
if (current->mm &&
atomic_read(&current->mm->context.vas_windows))
(cpu_has_feature(CPU_FTR_ARCH_31) ||
atomic_read(&current->mm->context.vas_windows)))
asm volatile(PPC_CP_ABORT);
}
#endif /* CONFIG_PPC_BOOK3S_64 */

7
arch/powerpc/kvm/book3s_hv.c
View File

@ -3530,6 +3530,13 @@ static int kvmhv_load_hv_regs_and_go(struct kvm_vcpu *vcpu, u64 time_limit,
*/
asm volatile("eieio; tlbsync; ptesync");
/*
* cp_abort is required if the processor supports local copy-paste
* to clear the copy buffer that was under control of the guest.
*/
if (cpu_has_feature(CPU_FTR_ARCH_31))
asm volatile(PPC_CP_ABORT);
mtspr(SPRN_LPID, vcpu->kvm->arch.host_lpid); /* restore host LPID */
isync();

8
arch/powerpc/kvm/book3s_hv_rmhandlers.S
View File

@ -1830,6 +1830,14 @@ END_FTR_SECTION_IFSET(CPU_FTR_P9_RADIX_PREFETCH_BUG)
2:
#endif /* CONFIG_PPC_RADIX_MMU */
/*
* cp_abort is required if the processor supports local copy-paste
* to clear the copy buffer that was under control of the guest.
*/
BEGIN_FTR_SECTION
PPC_CP_ABORT
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_31)
/*
* POWER7/POWER8 guest -> host partition switch code.
* We don't have to lock against tlbies but we do