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[POWERPC] Implement SLB shadow buffer

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This adds a shadow buffer for the SLBs and regsiters it with PHYP.
Only the bolted SLB entries (top 3) are shadowed.

The SLB shadow buffer tells the hypervisor what the kernel needs to
have in the SLB for the kernel to be able to function.  The hypervisor
can use this information to speed up partition context switches.

Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Michael Neuling
2006-08-07 16:19:19 +10:00
committed by Paul Mackerras
parent 452b5e2121
commit 2f6093c847
9 changed files with 124 additions and 11 deletions
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12
arch/powerpc/platforms/pseries/setup.c
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@ -234,9 +234,17 @@ static void pseries_kexec_cpu_down_xics(int crash_shutdown, int secondary)
{
/* Don't risk a hypervisor call if we're crashing */
if (firmware_has_feature(FW_FEATURE_SPLPAR) && !crash_shutdown) {
unsigned long vpa = __pa(get_lppaca());
unsigned long addr;
if (unregister_vpa(hard_smp_processor_id(), vpa)) {
addr = __pa(get_slb_shadow());
if (unregister_slb_shadow(hard_smp_processor_id(), addr))
printk("SLB shadow buffer deregistration of "
"cpu %u (hw_cpu_id %d) failed\n",
smp_processor_id(),
hard_smp_processor_id());
addr = __pa(get_lppaca());
if (unregister_vpa(hard_smp_processor_id(), addr)) {
printk("VPA deregistration of cpu %u (hw_cpu_id %d) "
"failed\n", smp_processor_id(),
hard_smp_processor_id());