Re: [PATCH 05/18] KVM/MIPS32-VZ: VZ-ASE assembler wrapper functions to set GuestIDs

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Hello.

On 19-05-2013 9:47, Sanjay Lal wrote:

Signed-off-by: Sanjay Lal <sanjayl@xxxxxxxxxxx>
---
  arch/mips/kvm/kvm_vz_locore.S | 74 +++++++++++++++++++++++++++++++++++++++++++
  1 file changed, 74 insertions(+)
  create mode 100644 arch/mips/kvm/kvm_vz_locore.S

diff --git a/arch/mips/kvm/kvm_vz_locore.S b/arch/mips/kvm/kvm_vz_locore.S
new file mode 100644
index 0000000..6d037d7
--- /dev/null
+++ b/arch/mips/kvm/kvm_vz_locore.S
@@ -0,0 +1,74 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * KVM/MIPS: Assembler support for hardware virtualization extensions
+ *
+ * Copyright (C) 2012  MIPS Technologies, Inc.  All rights reserved.
+ * Authors: Yann Le Du <ledu@xxxxxxxxxxx>
+ */
+
+#include <asm/asm.h>
+#include <asm/asmmacro.h>
+#include <asm/regdef.h>
+#include <asm/mipsregs.h>
+#include <asm/asm-offsets.h>
+#include <asm/mipsvzregs.h>
+
+#define MIPSX(name)	mips32_ ## name
+
+/*
+ * This routine sets GuestCtl1.RID to GUESTCTL1_VZ_ROOT_GUESTID
+ * Inputs: none
+ */
+LEAF(MIPSX(ClearGuestRID))
+	.set	push
+	.set	mips32r2
+	.set	noreorder
+	mfc0	t0, CP0_GUESTCTL1
+	addiu	t1, zero, GUESTCTL1_VZ_ROOT_GUESTID
+	ins	t0, t1, GUESTCTL1_RID_SHIFT, GUESTCTL1_RID_WIDTH
+	mtc0	t0, CP0_GUESTCTL1 # Set GuestCtl1.RID = GUESTCTL1_VZ_ROOT_GUESTID
+	ehb
+	j	ra

   Not jr?

+	nop					# BD Slot

   Instruction in the delay slot is usually indented by extra space.

+	.set    pop
+END(MIPSX(ClearGuestRID))
+
+
+/*
+ * This routine sets GuestCtl1.RID to a new value
+ * Inputs: a0 = new GuestRID value (right aligned)
+ */
+LEAF(MIPSX(SetGuestRID))
+	.set	push
+	.set	mips32r2
+	.set	noreorder
+	mfc0	t0, CP0_GUESTCTL1
+	ins 	t0, a0, GUESTCTL1_RID_SHIFT, GUESTCTL1_RID_WIDTH
+	mtc0	t0, CP0_GUESTCTL1		# Set GuestCtl1.RID
+	ehb
+	j	ra
+	nop					# BD Slot

   Same here...

+	.set	pop
+END(MIPSX(SetGuestRID))
+
+
+	/*
+	 * This routine sets GuestCtl1.RID to GuestCtl1.ID
+	 * Inputs: none
+	 */
+LEAF(MIPSX(SetGuestRIDtoGuestID))
+	.set	push
+	.set	mips32r2
+	.set	noreorder
+	mfc0	t0, CP0_GUESTCTL1		# Get current GuestID
+	ext 	t1, t0, GUESTCTL1_ID_SHIFT, GUESTCTL1_ID_WIDTH
+	ins 	t0, t1, GUESTCTL1_RID_SHIFT, GUESTCTL1_RID_WIDTH
+	mtc0	t0, CP0_GUESTCTL1		# Set GuestCtl1.RID = GuestCtl1.ID
+	ehb
+	j	ra
+	nop 					# BD Slot

   ... and here.

+	.set	pop
+END(MIPSX(SetGuestRIDtoGuestID))

WBR, Sergei



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