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KVM: PPC: Book3S HV: Make sure we don't re-enter guest without XIVE loaded

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commit 43ff3f6523 upstream.

This fixes a bug where it is possible to enter a guest on a POWER9
system without having the XIVE (interrupt controller) context loaded.
This can happen because we unload the XIVE context from the CPU
before doing the real-mode handling for machine checks.  After the
real-mode handler runs, it is possible that we re-enter the guest
via a fast path which does not load the XIVE context.

To fix this, we move the unloading of the XIVE context to come after
the real-mode machine check handler is called.

Fixes: 5af5099385 ("KVM: PPC: Book3S HV: Native usage of the XIVE interrupt controller")
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Paul Mackerras
2018-01-11 14:31:43 +11:00
committed by Greg Kroah-Hartman
parent fe90a3a6f8
commit 88b64450cc
1 changed files with 20 additions and 20 deletions
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40
arch/powerpc/kvm/book3s_hv_rmhandlers.S
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@@ -1387,6 +1387,26 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300)
blt deliver_guest_interrupt
guest_exit_cont: /* r9 = vcpu, r12 = trap, r13 = paca */
/* Save more register state */
mfdar r6
mfdsisr r7
std r6, VCPU_DAR(r9)
stw r7, VCPU_DSISR(r9)
/* don't overwrite fault_dar/fault_dsisr if HDSI */
cmpwi r12,BOOK3S_INTERRUPT_H_DATA_STORAGE
beq mc_cont
std r6, VCPU_FAULT_DAR(r9)
stw r7, VCPU_FAULT_DSISR(r9)
/* See if it is a machine check */
cmpwi r12, BOOK3S_INTERRUPT_MACHINE_CHECK
beq machine_check_realmode
mc_cont:
#ifdef CONFIG_KVM_BOOK3S_HV_EXIT_TIMING
addi r3, r9, VCPU_TB_RMEXIT
mr r4, r9
bl kvmhv_accumulate_time
#endif
#ifdef CONFIG_KVM_XICS
/* We are exiting, pull the VP from the XIVE */
lwz r0, VCPU_XIVE_PUSHED(r9)
@@ -1424,26 +1444,6 @@ guest_exit_cont: /* r9 = vcpu, r12 = trap, r13 = paca */
eieio
1:
#endif /* CONFIG_KVM_XICS */
/* Save more register state */
mfdar r6
mfdsisr r7
std r6, VCPU_DAR(r9)
stw r7, VCPU_DSISR(r9)
/* don't overwrite fault_dar/fault_dsisr if HDSI */
cmpwi r12,BOOK3S_INTERRUPT_H_DATA_STORAGE
beq mc_cont
std r6, VCPU_FAULT_DAR(r9)
stw r7, VCPU_FAULT_DSISR(r9)
/* See if it is a machine check */
cmpwi r12, BOOK3S_INTERRUPT_MACHINE_CHECK
beq machine_check_realmode
mc_cont:
#ifdef CONFIG_KVM_BOOK3S_HV_EXIT_TIMING
addi r3, r9, VCPU_TB_RMEXIT
mr r4, r9
bl kvmhv_accumulate_time
#endif
mr r3, r12
/* Increment exit count, poke other threads to exit */