[PATCH] PPC64: Add VMX save flag to VPA

[Olof Johansson]

Hi,

We need to indicate to the hypervisor that it needs to save our VMX
registers when switching partitions on a shared-processor system, just
as it needs to for FP and PMC registers.

This could be made to be on-demand when VMX is used, but we don't do
that for FP nor PMC right now either so let's not overcomplicate things.


Signed-off-by: Olof Johansson <olof at lixom.net>


Index: 2.6/arch/ppc64/kernel/pacaData.c
===================================================================
--- 2.6.orig/arch/ppc64/kernel/pacaData.c	2005-08-03 19:53:16.000000000 -0500
+++ 2.6/arch/ppc64/kernel/pacaData.c	2005-08-04 19:26:26.000000000 -0500
@@ -59,6 +59,7 @@ extern unsigned long __toc_start;
 		.fpregs_in_use = 1,					    \
 		.end_of_quantum = 0xfffffffffffffffful,			    \
 		.slb_count = 64,					    \
+		.vmxregs_in_use = 0,					    \
 	},								    \
 
 #ifdef CONFIG_PPC_ISERIES
Index: 2.6/include/asm-ppc64/lppaca.h
===================================================================
--- 2.6.orig/include/asm-ppc64/lppaca.h	2005-08-04 19:25:54.000000000 -0500
+++ 2.6/include/asm-ppc64/lppaca.h	2005-08-04 19:26:15.000000000 -0500
@@ -108,7 +108,7 @@ struct lppaca
 	volatile u32 virtual_decr;	// Virtual DECR for shared procsx78-x7B
 	u16	slb_count;		// # of SLBs to maintain        x7C-x7D
 	u8	idle;			// Indicate OS is idle          x7E
-	u8	reserved5;		// Reserved                     x7F
+	u8	vmxregs_in_use;		// VMX registers in use         x7F
 
 
 //=============================================================================
Index: 2.6/arch/ppc64/kernel/pSeries_lpar.c
===================================================================
--- 2.6.orig/arch/ppc64/kernel/pSeries_lpar.c	2005-08-03 19:53:16.000000000 -0500
+++ 2.6/arch/ppc64/kernel/pSeries_lpar.c	2005-08-04 19:35:41.000000000 -0500
@@ -267,6 +267,10 @@ void vpa_init(int cpu)
 
 	/* Register the Virtual Processor Area (VPA) */
 	flags = 1UL << (63 - 18);
+
+	if (cpu_has_feature(CPU_FTR_ALTIVEC))
+		paca[cpu].lppaca.vmxregs_in_use = 1;
+
 	ret = register_vpa(flags, hwcpu, __pa(vpa));
 
 	if (ret)