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KVM: PPC: Move kvm_vcpu_ioctl_[gs]et_one_reg down to platform-specific code 

This moves the get/set_one_reg implementation down from powerpc.c into
booke.c, book3s_pr.c and book3s_hv.c.  This avoids #ifdefs in C code,
but more importantly, it fixes a bug on Book3s HV where we were
accessing beyond the end of the kvm_vcpu struct (via the to_book3s()
macro) and corrupting memory, causing random crashes and file corruption.

On Book3s HV we only accept setting the HIOR to zero, since the guest
runs in supervisor mode and its vectors are never offset from zero.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Alexander Graf <agraf@suse.de>
[agraf update to apply on top of changed ONE_REG patches]
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Paul Mackerras 2011-12-12 12:26:50 +00:00 committed by Avi Kivity
parent 1022fc3d3b
commit 31f3438eca
5 changed files with 81 additions and 38 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
arch/powerpc/include/asm/kvm_ppc.h
View File

@ -176,6 +176,9 @@ int kvmppc_core_set_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs);
void kvmppc_get_sregs_ivor(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs);
int kvmppc_set_sregs_ivor(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs);
int kvm_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg);
int kvm_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg);
void kvmppc_set_pid(struct kvm_vcpu *vcpu, u32 pid);
#ifdef CONFIG_KVM_BOOK3S_64_HV

36
arch/powerpc/kvm/book3s_hv.c
View File

@ -398,6 +398,42 @@ int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
return 0;
}
int kvm_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg)
{
int r = -EINVAL;
switch (reg->id) {
case KVM_REG_PPC_HIOR:
r = put_user(0, (u64 __user *)reg->addr);
break;
default:
break;
}
return r;
}
int kvm_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg)
{
int r = -EINVAL;
switch (reg->id) {
case KVM_REG_PPC_HIOR:
{
u64 hior;
/* Only allow this to be set to zero */
r = get_user(hior, (u64 __user *)reg->addr);
if (!r && (hior != 0))
r = -EINVAL;
break;
}
default:
break;
}
return r;
}
int kvmppc_core_check_processor_compat(void)
{
if (cpu_has_feature(CPU_FTR_HVMODE))

32
arch/powerpc/kvm/book3s_pr.c
View File

@ -874,6 +874,38 @@ int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
return 0;
}
int kvm_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg)
{
int r = -EINVAL;
switch (reg->id) {
case KVM_REG_PPC_HIOR:
r = put_user(to_book3s(vcpu)->hior, (u64 __user *)reg->addr);
break;
default:
break;
}
return r;
}
int kvm_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg)
{
int r = -EINVAL;
switch (reg->id) {
case KVM_REG_PPC_HIOR:
r = get_user(to_book3s(vcpu)->hior, (u64 __user *)reg->addr);
if (!r)
to_book3s(vcpu)->hior_explicit = true;
break;
default:
break;
}
return r;
}
int kvmppc_core_check_processor_compat(void)
{
return 0;

10
arch/powerpc/kvm/booke.c
View File

@ -887,6 +887,16 @@ int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
return kvmppc_core_set_sregs(vcpu, sregs);
}
int kvm_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg)
{
return -EINVAL;
}
int kvm_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg)
{
return -EINVAL;
}
int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
{
return -ENOTSUPP;

38
arch/powerpc/kvm/powerpc.c
View File

@ -647,44 +647,6 @@ static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu,
return r;
}
static int kvm_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu,
struct kvm_one_reg *reg)
{
int r = -EINVAL;
switch (reg->id) {
#ifdef CONFIG_PPC_BOOK3S
case KVM_REG_PPC_HIOR:
r = put_user(to_book3s(vcpu)->hior, (u64 __user *)reg->addr);
break;
#endif
default:
break;
}
return r;
}
static int kvm_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu,
struct kvm_one_reg *reg)
{
int r = -EINVAL;
switch (reg->id) {
#ifdef CONFIG_PPC_BOOK3S
case KVM_ONE_REG_PPC_HIOR:
r = get_user(to_book3s(vcpu)->hior, (u64 __user *)reg->addr);
if (!r)
to_book3s(vcpu)->hior_explicit = true;
break;
#endif
default:
break;
}
return r;
}
int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
struct kvm_mp_state *mp_state)
{