[PATCH v1 1/7] KVM: PPC: Book3S 64: move KVM interrupt entry to a common entry point

[Nicholas Piggin]

Rather than bifurcate the call depending on whether or not HV is
possible, and have the HV entry test for PR, just make a single
common point which does the demultiplexing. This makes it simpler
to add another type of exit handler.

Acked-by: Paul Mackerras <paulus at ozlabs.org>
Reviewed-by: Daniel Axtens <dja at axtens.net>
Reviewed-by: Fabiano Rosas <farosas at linux.ibm.com>
Signed-off-by: Nicholas Piggin <npiggin at gmail.com>
---
 arch/powerpc/kernel/exceptions-64s.S    |  8 +-----
 arch/powerpc/kvm/Makefile               |  3 +++
 arch/powerpc/kvm/book3s_64_entry.S      | 36 +++++++++++++++++++++++++
 arch/powerpc/kvm/book3s_hv_rmhandlers.S | 11 ++------
 4 files changed, 42 insertions(+), 16 deletions(-)
 create mode 100644 arch/powerpc/kvm/book3s_64_entry.S

diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S
index 358cd4b0c08e..bdec40bd92a8 100644
--- a/arch/powerpc/kernel/exceptions-64s.S
+++ b/arch/powerpc/kernel/exceptions-64s.S
@@ -208,7 +208,6 @@ do_define_int n
 .endm
 
 #ifdef CONFIG_KVM_BOOK3S_64_HANDLER
-#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
 /*
  * All interrupts which set HSRR registers, as well as SRESET and MCE and
  * syscall when invoked with "sc 1" switch to MSR[HV]=1 (HVMODE) to be taken,
@@ -238,13 +237,8 @@ do_define_int n
 
 /*
  * If an interrupt is taken while a guest is running, it is immediately routed
- * to KVM to handle. If both HV and PR KVM arepossible, KVM interrupts go first
- * to kvmppc_interrupt_hv, which handles the PR guest case.
+ * to KVM to handle.
  */
-#define kvmppc_interrupt kvmppc_interrupt_hv
-#else
-#define kvmppc_interrupt kvmppc_interrupt_pr
-#endif
 
 .macro KVMTEST name
 	lbz	r10,HSTATE_IN_GUEST(r13)
diff --git a/arch/powerpc/kvm/Makefile b/arch/powerpc/kvm/Makefile
index 2bfeaa13befb..cdd119028f64 100644
--- a/arch/powerpc/kvm/Makefile
+++ b/arch/powerpc/kvm/Makefile
@@ -59,6 +59,9 @@ kvm-pr-y := \
 kvm-book3s_64-builtin-objs-$(CONFIG_KVM_BOOK3S_64_HANDLER) += \
 	tm.o
 
+kvm-book3s_64-builtin-objs-y += \
+	book3s_64_entry.o
+
 ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
 kvm-book3s_64-builtin-objs-$(CONFIG_KVM_BOOK3S_64_HANDLER) += \
 	book3s_rmhandlers.o
diff --git a/arch/powerpc/kvm/book3s_64_entry.S b/arch/powerpc/kvm/book3s_64_entry.S
new file mode 100644
index 000000000000..7a039ea78f15
--- /dev/null
+++ b/arch/powerpc/kvm/book3s_64_entry.S
@@ -0,0 +1,36 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+#include <asm/asm-offsets.h>
+#include <asm/cache.h>
+#include <asm/kvm_asm.h>
+#include <asm/kvm_book3s_asm.h>
+#include <asm/ppc_asm.h>
+#include <asm/reg.h>
+
+/*
+ * This is branched to from interrupt handlers in exception-64s.S which set
+ * IKVM_REAL or IKVM_VIRT, if HSTATE_IN_GUEST was found to be non-zero.
+ */
+.global	kvmppc_interrupt
+.balign IFETCH_ALIGN_BYTES
+kvmppc_interrupt:
+	/*
+	 * Register contents:
+	 * R12		= (guest CR << 32) | interrupt vector
+	 * R13		= PACA
+	 * guest R12 saved in shadow VCPU SCRATCH0
+	 * guest R13 saved in SPRN_SCRATCH0
+	 */
+#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
+	std	r9,HSTATE_SCRATCH2(r13)
+	lbz	r9,HSTATE_IN_GUEST(r13)
+	cmpwi	r9,KVM_GUEST_MODE_HOST_HV
+	beq	kvmppc_bad_host_intr
+#ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
+	cmpwi	r9,KVM_GUEST_MODE_GUEST
+	ld	r9,HSTATE_SCRATCH2(r13)
+	beq	kvmppc_interrupt_pr
+#endif
+	b	kvmppc_interrupt_hv
+#else
+	b	kvmppc_interrupt_pr
+#endif
diff --git a/arch/powerpc/kvm/book3s_hv_rmhandlers.S b/arch/powerpc/kvm/book3s_hv_rmhandlers.S
index 5e634db4809b..f976efb7e4a9 100644
--- a/arch/powerpc/kvm/book3s_hv_rmhandlers.S
+++ b/arch/powerpc/kvm/book3s_hv_rmhandlers.S
@@ -1269,16 +1269,8 @@ kvmppc_interrupt_hv:
 	 * R13		= PACA
 	 * guest R12 saved in shadow VCPU SCRATCH0
 	 * guest R13 saved in SPRN_SCRATCH0
+	 * guest R9 saved in HSTATE_SCRATCH2
 	 */
-	std	r9, HSTATE_SCRATCH2(r13)
-	lbz	r9, HSTATE_IN_GUEST(r13)
-	cmpwi	r9, KVM_GUEST_MODE_HOST_HV
-	beq	kvmppc_bad_host_intr
-#ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
-	cmpwi	r9, KVM_GUEST_MODE_GUEST
-	ld	r9, HSTATE_SCRATCH2(r13)
-	beq	kvmppc_interrupt_pr
-#endif
 	/* We're now back in the host but in guest MMU context */
 	li	r9, KVM_GUEST_MODE_HOST_HV
 	stb	r9, HSTATE_IN_GUEST(r13)
@@ -3280,6 +3272,7 @@ END_FTR_SECTION_IFCLR(CPU_FTR_P9_TM_HV_ASSIST)
  * cfar is saved in HSTATE_CFAR(r13)
  * ppr is saved in HSTATE_PPR(r13)
  */
+.global kvmppc_bad_host_intr
 kvmppc_bad_host_intr:
 	/*
 	 * Switch to the emergency stack, but start half-way down in
-- 
2.23.0