xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

KVM: PPC: Add HPT preallocator

Browse Source 
We're currently allocating 16MB of linear memory on demand when creating
a guest. That does work some times, but finding 16MB of linear memory
available in the system at runtime is definitely not a given.

So let's add another command line option similar to the RMA preallocator,
that we can use to keep a pool of page tables around. Now, when a guest
gets created it has a pretty low chance of receiving an OOM.

Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Alexander Graf
2012-01-16 19:12:11 +01:00
committed by Avi Kivity
parent b7f5d0114c
commit d2a1b483a4
4 changed files with 57 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

39
arch/powerpc/kvm/book3s_hv_builtin.c
View File

@@ -19,6 +19,7 @@
#include <asm/kvm_book3s.h>
#define KVM_LINEAR_RMA 0
#define KVM_LINEAR_HPT 1
static void __init kvm_linear_init_one(ulong size, int count, int type);
static struct kvmppc_linear_info *kvm_alloc_linear(int type);
@@ -97,6 +98,39 @@ void kvm_release_rma(struct kvmppc_linear_info *ri)
}
EXPORT_SYMBOL_GPL(kvm_release_rma);
/*************** HPT *************/
/*
* This maintains a list of big linear HPT tables that contain the GVA->HPA
* memory mappings. If we don't reserve those early on, we might not be able
* to get a big (usually 16MB) linear memory region from the kernel anymore.
*/
static unsigned long kvm_hpt_count;
static int __init early_parse_hpt_count(char *p)
{
if (!p)
return 1;
kvm_hpt_count = simple_strtoul(p, NULL, 0);
return 0;
}
early_param("kvm_hpt_count", early_parse_hpt_count);
struct kvmppc_linear_info *kvm_alloc_hpt(void)
{
return kvm_alloc_linear(KVM_LINEAR_HPT);
}
EXPORT_SYMBOL_GPL(kvm_alloc_hpt);
void kvm_release_hpt(struct kvmppc_linear_info *li)
{
kvm_release_linear(li);
}
EXPORT_SYMBOL_GPL(kvm_release_hpt);
/*************** generic *************/
static LIST_HEAD(free_linears);
@@ -114,7 +148,7 @@ static void __init kvm_linear_init_one(ulong size, int count, int type)
if (!count)
return;
typestr = (type == KVM_LINEAR_RMA) ? "RMA" : "";
typestr = (type == KVM_LINEAR_RMA) ? "RMA" : "HPT";
npages = size >> PAGE_SHIFT;
linear_info = alloc_bootmem(count * sizeof(struct kvmppc_linear_info));
@@ -173,6 +207,9 @@ static void kvm_release_linear(struct kvmppc_linear_info *ri)
*/
void __init kvm_linear_init(void)
{
/* HPT */
kvm_linear_init_one(1 << HPT_ORDER, kvm_hpt_count, KVM_LINEAR_HPT);
/* RMA */
/* Only do this on PPC970 in HV mode */
if (!cpu_has_feature(CPU_FTR_HVMODE) ||