KVM: PPC: Book3S HV: Convert kvmppc_read_intr to a C function

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Modify kvmppc_read_intr to make it a C function.  Because it is called
from kvmppc_check_wake_reason, any of the assembler code that calls
either kvmppc_read_intr or kvmppc_check_wake_reason now has to assume
that the volatile registers might have been modified.

This also adds in the optimization of clearing saved_xirr in the case
where we completely handle and EOI an IPI.  Without this, the next
device interrupt will require two trips through the host interrupt
handling code.

[paulus@ozlabs.org - made kvmppc_check_wake_reason create a stack frame
 when it is calling kvmppc_read_intr, which means we can set r12 to
 the trap number (0x500) after the call to kvmppc_read_intr, instead
 of using r31.  Also moved the deliver_guest_interrupt label so as to
 restore XER and CTR, plus other minor tweaks.]

Signed-off-by: Suresh Warrier <warrier@linux.vnet.ibm.com>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>

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Suresh Warrier 2016-08-19 15:35:46 +10:00 • committed by Paul Mackerras

parent 99212c864e

commit 37f55d30df

2 changed files with 158 additions and 84 deletions

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84

arch/powerpc/kvm/book3s_hv_builtin.c

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158

arch/powerpc/kvm/book3s_hv_rmhandlers.S

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