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KVM: PPC: Add feature bitmap for magic page

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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>
This commit is contained in:
Alexander Graf 2010-08-03 11:32:56 +02:00 committed by Avi Kivity
parent cb24c50826
commit 7508e16c9f
3 changed files with 21 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/powerpc/include/asm/kvm_para.h
View File

@ -47,6 +47,8 @@ struct kvm_vcpu_arch_shared {
#define KVM_FEATURE_MAGIC_PAGE 1
#define KVM_MAGIC_FEAT_SR (1 << 0)
#ifdef __KERNEL__
#ifdef CONFIG_KVM_GUEST

21
arch/powerpc/kernel/kvm.c
View File

@ -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");

5
arch/powerpc/kvm/powerpc.c
View File

@ -66,6 +66,8 @@ int kvmppc_kvm_pv(struct kvm_vcpu *vcpu)
vcpu->arch.magic_page_pa = param1;
vcpu->arch.magic_page_ea = param2;
r2 = 0;
r = HC_EV_SUCCESS;
break;
}
@ -76,13 +78,14 @@ int kvmppc_kvm_pv(struct kvm_vcpu *vcpu)
#endif
/* Second return value is in r4 */
kvmppc_set_gpr(vcpu, 4, r2);
break;
default:
r = HC_EV_UNIMPLEMENTED;
break;
}
kvmppc_set_gpr(vcpu, 4, r2);
return r;
}