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KVM: PPC: Book3S HV: Pull out interrupt-reading code into a subroutine

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This moves the code in book3s_hv_rmhandlers.S that reads any pending
interrupt from the XICS interrupt controller, and works out whether
it is an IPI for the guest, an IPI for the host, or a device interrupt,
into a new function called kvmppc_read_intr.  Later patches will
need this.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Paul Mackerras 2013-09-06 13:24:13 +10:00 committed by Alexander Graf
parent 218309b75b
commit c934243ca0
1 changed files with 68 additions and 49 deletions
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117
arch/powerpc/kvm/book3s_hv_rmhandlers.S
View file

@ -862,46 +862,11 @@ END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_206)
* set, we know the host wants us out so let's do it now
*/
do_ext_interrupt:
lbz r0, HSTATE_HOST_IPI(r13)
cmpwi r0, 0
bne ext_interrupt_to_host
/* Now read the interrupt from the ICP */
ld r5, HSTATE_XICS_PHYS(r13)
li r7, XICS_XIRR
cmpdi r5, 0
beq- ext_interrupt_to_host
lwzcix r3, r5, r7
rlwinm. r0, r3, 0, 0xffffff
sync
beq 3f /* if nothing pending in the ICP */
/* We found something in the ICP...
*
* If it's not an IPI, stash it in the PACA and return to
* the host, we don't (yet) handle directing real external
* interrupts directly to the guest
*/
cmpwi r0, XICS_IPI
bne ext_stash_for_host
/* It's an IPI, clear the MFRR and EOI it */
li r0, 0xff
li r6, XICS_MFRR
stbcix r0, r5, r6 /* clear the IPI */
stwcix r3, r5, r7 /* EOI it */
sync
/* We need to re-check host IPI now in case it got set in the
* meantime. If it's clear, we bounce the interrupt to the
* guest
*/
lbz r0, HSTATE_HOST_IPI(r13)
cmpwi r0, 0
bne- 1f
bl kvmppc_read_intr
cmpdi r3, 0
bgt ext_interrupt_to_host
/* Allright, looks like an IPI for the guest, we need to set MER */
3:
/* Check if any CPU is heading out to the host, if so head out too */
ld r5, HSTATE_KVM_VCORE(r13)
lwz r0, VCORE_ENTRY_EXIT(r5)
@ -930,17 +895,6 @@ do_ext_interrupt:
mtspr SPRN_LPCR, r8
b fast_guest_return
/* We raced with the host, we need to resend that IPI, bummer */
1: li r0, IPI_PRIORITY
stbcix r0, r5, r6 /* set the IPI */
sync
b ext_interrupt_to_host
ext_stash_for_host:
/* It's not an IPI and it's for the host, stash it in the PACA
* before exit, it will be picked up by the host ICP driver
*/
stw r3, HSTATE_SAVED_XIRR(r13)
ext_interrupt_to_host:
guest_exit_cont: /* r9 = vcpu, r12 = trap, r13 = paca */
@ -1815,6 +1769,71 @@ machine_check_realmode:
rotldi r11, r11, 63
b fast_interrupt_c_return
/*
* Determine what sort of external interrupt is pending (if any).
* Returns:
* 0 if no interrupt is pending
* 1 if an interrupt is pending that needs to be handled by the host
* -1 if there was a guest wakeup IPI (which has now been cleared)
*/
kvmppc_read_intr:
/* see if a host IPI is pending */
li r3, 1
lbz r0, HSTATE_HOST_IPI(r13)
cmpwi r0, 0
bne 1f
/* Now read the interrupt from the ICP */
ld r6, HSTATE_XICS_PHYS(r13)
li r7, XICS_XIRR
cmpdi r6, 0
beq- 1f
lwzcix r0, r6, r7
rlwinm. r3, r0, 0, 0xffffff
sync
beq 1f /* if nothing pending in the ICP */
/* We found something in the ICP...
*
* If it's not an IPI, stash it in the PACA and return to
* the host, we don't (yet) handle directing real external
* interrupts directly to the guest
*/
cmpwi r3, XICS_IPI /* if there is, is it an IPI? */
li r3, 1
bne 42f
/* It's an IPI, clear the MFRR and EOI it */
li r3, 0xff
li r8, XICS_MFRR
stbcix r3, r6, r8 /* clear the IPI */
stwcix r0, r6, r7 /* EOI it */
sync
/* We need to re-check host IPI now in case it got set in the
* meantime. If it's clear, we bounce the interrupt to the
* guest
*/
lbz r0, HSTATE_HOST_IPI(r13)
cmpwi r0, 0
bne- 43f
/* OK, it's an IPI for us */
li r3, -1
1: blr
42: /* It's not an IPI and it's for the host, stash it in the PACA
* before exit, it will be picked up by the host ICP driver
*/
stw r0, HSTATE_SAVED_XIRR(r13)
b 1b
43: /* We raced with the host, we need to resend that IPI, bummer */
li r0, IPI_PRIORITY
stbcix r0, r6, r8 /* set the IPI */
sync
b 1b
/*
* Save away FP, VMX and VSX registers.
* r3 = vcpu pointer