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authorLinus Torvalds <torvalds@linux-foundation.org>2021-11-27 19:06:15 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2021-11-27 19:06:15 +0100
commit7b65b798a604aff77d5e744833b5d452d2081467 (patch)
tree675054960b63e56ca5b792fc975fbe63c4cadb62 /arch
parentMerge tag 'mips-fixes_5.16_2' of git://git.kernel.org/pub/scm/linux/kernel/gi... (diff)
parentpowerpc/32: Fix hardlockup on vmap stack overflow (diff)
downloadlinux-7b65b798a604aff77d5e744833b5d452d2081467.tar.xz
linux-7b65b798a604aff77d5e744833b5d452d2081467.zip
Merge tag 'powerpc-5.16-3' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux
Pull powerpc fixes from Michael Ellerman: "Fix KVM using a Power9 instruction on earlier CPUs, which could lead to the host SLB being incorrectly invalidated and a subsequent host crash. Fix kernel hardlockup on vmap stack overflow on 32-bit. Thanks to Christophe Leroy, Nicholas Piggin, and Fabiano Rosas" * tag 'powerpc-5.16-3' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: powerpc/32: Fix hardlockup on vmap stack overflow KVM: PPC: Book3S HV: Prevent POWER7/8 TLB flush flushing SLB
Diffstat (limited to 'arch')
-rw-r--r--arch/powerpc/kernel/head_32.h6
-rw-r--r--arch/powerpc/kvm/book3s_hv_builtin.c5
2 files changed, 7 insertions, 4 deletions
diff --git a/arch/powerpc/kernel/head_32.h b/arch/powerpc/kernel/head_32.h
index 6b1ec9e3541b..349c4a820231 100644
--- a/arch/powerpc/kernel/head_32.h
+++ b/arch/powerpc/kernel/head_32.h
@@ -202,11 +202,11 @@ vmap_stack_overflow:
mfspr r1, SPRN_SPRG_THREAD
lwz r1, TASK_CPU - THREAD(r1)
slwi r1, r1, 3
- addis r1, r1, emergency_ctx@ha
+ addis r1, r1, emergency_ctx-PAGE_OFFSET@ha
#else
- lis r1, emergency_ctx@ha
+ lis r1, emergency_ctx-PAGE_OFFSET@ha
#endif
- lwz r1, emergency_ctx@l(r1)
+ lwz r1, emergency_ctx-PAGE_OFFSET@l(r1)
addi r1, r1, THREAD_SIZE - INT_FRAME_SIZE
EXCEPTION_PROLOG_2 0 vmap_stack_overflow
prepare_transfer_to_handler
diff --git a/arch/powerpc/kvm/book3s_hv_builtin.c b/arch/powerpc/kvm/book3s_hv_builtin.c
index fcf4760a3a0e..70b7a8f97153 100644
--- a/arch/powerpc/kvm/book3s_hv_builtin.c
+++ b/arch/powerpc/kvm/book3s_hv_builtin.c
@@ -695,6 +695,7 @@ static void flush_guest_tlb(struct kvm *kvm)
"r" (0) : "memory");
}
asm volatile("ptesync": : :"memory");
+ // POWER9 congruence-class TLBIEL leaves ERAT. Flush it now.
asm volatile(PPC_RADIX_INVALIDATE_ERAT_GUEST : : :"memory");
} else {
for (set = 0; set < kvm->arch.tlb_sets; ++set) {
@@ -705,7 +706,9 @@ static void flush_guest_tlb(struct kvm *kvm)
rb += PPC_BIT(51); /* increment set number */
}
asm volatile("ptesync": : :"memory");
- asm volatile(PPC_ISA_3_0_INVALIDATE_ERAT : : :"memory");
+ // POWER9 congruence-class TLBIEL leaves ERAT. Flush it now.
+ if (cpu_has_feature(CPU_FTR_ARCH_300))
+ asm volatile(PPC_ISA_3_0_INVALIDATE_ERAT : : :"memory");
}
}