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KVM: PPC: Book3S HV: Prepare for host using hypervisor doorbells

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POWER8 has support for hypervisor doorbell interrupts.  Though the
kernel doesn't use them for IPIs on the powernv platform yet, it
probably will in future, so this makes KVM cope gracefully if a
hypervisor doorbell interrupt arrives while in a guest.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Paul Mackerras 2014-01-08 21:25:28 +11:00 committed by Alexander Graf
parent e0622bd9f2
commit 5d00f66b86
3 changed files with 9 additions and 0 deletions
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1
arch/powerpc/include/asm/kvm_asm.h
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@ -96,6 +96,7 @@
#define BOOK3S_INTERRUPT_H_DATA_STORAGE 0xe00
#define BOOK3S_INTERRUPT_H_INST_STORAGE 0xe20
#define BOOK3S_INTERRUPT_H_EMUL_ASSIST 0xe40
#define BOOK3S_INTERRUPT_H_DOORBELL 0xe80
#define BOOK3S_INTERRUPT_PERFMON 0xf00
#define BOOK3S_INTERRUPT_ALTIVEC 0xf20
#define BOOK3S_INTERRUPT_VSX 0xf40

1
arch/powerpc/kvm/book3s_hv.c
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@ -651,6 +651,7 @@ static int kvmppc_handle_exit_hv(struct kvm_run *run, struct kvm_vcpu *vcpu,
r = RESUME_GUEST;
break;
case BOOK3S_INTERRUPT_EXTERNAL:
case BOOK3S_INTERRUPT_H_DOORBELL:
vcpu->stat.ext_intr_exits++;
r = RESUME_GUEST;
break;

7
arch/powerpc/kvm/book3s_hv_rmhandlers.S
View File

@ -1997,10 +1997,17 @@ ALT_FTR_SECTION_END_IFSET(CPU_FTR_ARCH_207S)
BEGIN_FTR_SECTION
cmpwi r6, 5 /* privileged doorbell? */
beq 0f
cmpwi r6, 3 /* hypervisor doorbell? */
beq 3f
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
li r3, 1 /* anything else, return 1 */
0: blr
/* hypervisor doorbell */
3: li r12, BOOK3S_INTERRUPT_H_DOORBELL
li r3, 1
blr
/*
* Determine what sort of external interrupt is pending (if any).
* Returns: