From: Michael Ellerman mpe@ellerman.id.au
commit cdeb5d7d890e14f3b70e8087e745c4a6a7d9f337 upstream.
We call idle_kvm_start_guest() from power7_offline() if the thread has been requested to enter KVM. We pass it the SRR1 value that was returned from power7_idle_insn() which tells us what sort of wakeup we're processing.
Depending on the SRR1 value we pass in, the KVM code might enter the guest, or it might return to us to do some host action if the wakeup requires it.
If idle_kvm_start_guest() is able to handle the wakeup, and enter the guest it is supposed to indicate that by returning a zero SRR1 value to us.
That was the behaviour prior to commit 10d91611f426 ("powerpc/64s: Reimplement book3s idle code in C"), however in that commit the handling of SRR1 was reworked, and the zeroing behaviour was lost.
Returning from idle_kvm_start_guest() without zeroing the SRR1 value can confuse the host offline code, causing the guest to crash and other weirdness.
Fixes: 10d91611f426 ("powerpc/64s: Reimplement book3s idle code in C") Cc: stable@vger.kernel.org # v5.2+ Signed-off-by: Michael Ellerman mpe@ellerman.id.au Link: https://lore.kernel.org/r/20211015133929.832061-2-mpe@ellerman.id.au Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/powerpc/kvm/book3s_hv_rmhandlers.S | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-)
--- a/arch/powerpc/kvm/book3s_hv_rmhandlers.S +++ b/arch/powerpc/kvm/book3s_hv_rmhandlers.S @@ -301,6 +301,7 @@ _GLOBAL(idle_kvm_start_guest) stdu r1, -SWITCH_FRAME_SIZE(r4) // Switch to new frame on emergency stack mr r1, r4 + std r3, 32(r1) // Save SRR1 wakeup value SAVE_NVGPRS(r1)
/* @@ -352,6 +353,10 @@ kvm_unsplit_wakeup:
kvm_secondary_got_guest:
+ // About to go to guest, clear saved SRR1 + li r0, 0 + std r0, 32(r1) + /* Set HSTATE_DSCR(r13) to something sensible */ ld r6, PACA_DSCR_DEFAULT(r13) std r6, HSTATE_DSCR(r13) @@ -443,8 +448,8 @@ kvm_no_guest: mfspr r4, SPRN_LPCR rlwimi r4, r3, 0, LPCR_PECE0 | LPCR_PECE1 mtspr SPRN_LPCR, r4 - /* set up r3 for return */ - mfspr r3,SPRN_SRR1 + // Return SRR1 wakeup value, or 0 if we went into the guest + ld r3, 32(r1) REST_NVGPRS(r1) ld r1, 0(r1) // Switch back to caller stack ld r0, 16(r1) // Reload LR