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authorAlexander Graf <agraf@suse.de>2010-08-03 11:32:56 +0200
committerAvi Kivity <avi@redhat.com>2010-10-24 10:52:09 +0200
commit7508e16c9f2a20f7721d7bc47c33a7b34c873a2c (patch)
treedac48c9ea56f69f4d8b9759aa51349bad0f3abdc /arch/powerpc/kernel
parentcb24c50826e0722bffb0674f088954cd4980818b (diff)
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KVM: PPC: Add feature bitmap for magic page
We will soon add SR PV support to the shared page, so we need some infrastructure that allows the guest to query for features KVM exports. This patch adds a second return value to the magic mapping that indicated to the guest which features are available. Signed-off-by: Alexander Graf <agraf@suse.de>
Diffstat (limited to 'arch/powerpc/kernel')
-rw-r--r--arch/powerpc/kernel/kvm.c21
1 files changed, 15 insertions, 6 deletions
diff --git a/arch/powerpc/kernel/kvm.c b/arch/powerpc/kernel/kvm.c
index d3a2cc5..226882f 100644
--- a/arch/powerpc/kernel/kvm.c
+++ b/arch/powerpc/kernel/kvm.c
@@ -266,12 +266,20 @@ static void kvm_patch_ins_wrteei(u32 *inst)
static void kvm_map_magic_page(void *data)
{
- kvm_hypercall2(KVM_HC_PPC_MAP_MAGIC_PAGE,
- KVM_MAGIC_PAGE, /* Physical Address */
- KVM_MAGIC_PAGE); /* Effective Address */
+ u32 *features = data;
+
+ ulong in[8];
+ ulong out[8];
+
+ in[0] = KVM_MAGIC_PAGE;
+ in[1] = KVM_MAGIC_PAGE;
+
+ kvm_hypercall(in, out, HC_VENDOR_KVM | KVM_HC_PPC_MAP_MAGIC_PAGE);
+
+ *features = out[0];
}
-static void kvm_check_ins(u32 *inst)
+static void kvm_check_ins(u32 *inst, u32 features)
{
u32 _inst = *inst;
u32 inst_no_rt = _inst & ~KVM_MASK_RT;
@@ -367,9 +375,10 @@ static void kvm_use_magic_page(void)
u32 *p;
u32 *start, *end;
u32 tmp;
+ u32 features;
/* Tell the host to map the magic page to -4096 on all CPUs */
- on_each_cpu(kvm_map_magic_page, NULL, 1);
+ on_each_cpu(kvm_map_magic_page, &features, 1);
/* Quick self-test to see if the mapping works */
if (__get_user(tmp, (u32*)KVM_MAGIC_PAGE)) {
@@ -382,7 +391,7 @@ static void kvm_use_magic_page(void)
end = (void*)_etext;
for (p = start; p < end; p++)
- kvm_check_ins(p);
+ kvm_check_ins(p, features);
printk(KERN_INFO "KVM: Live patching for a fast VM %s\n",
kvm_patching_worked ? "worked" : "failed");