2019-10-22 02:05:39

by Sean Christopherson

Subject: [PATCH 02/45] KVM: PPC: Book3S PR: Free shared page if mmu initialization fails

Explicitly free the shared page if kvmppc_mmu_init() fails during
kvmppc_core_vcpu_create(), as the page is freed only in
kvmppc_core_vcpu_free(), which is not reached via kvm_vcpu_uninit().

Fixes: 96bc451a15329 ("KVM: PPC: Introduce shared page")
Cc: [email protected]
Signed-off-by: Sean Christopherson <[email protected]>
---
arch/powerpc/kvm/book3s_pr.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c
index cc65af8fe6f7..3f6ad3f58628 100644
--- a/arch/powerpc/kvm/book3s_pr.c
+++ b/arch/powerpc/kvm/book3s_pr.c
@@ -1769,10 +1769,12 @@ static struct kvm_vcpu *kvmppc_core_vcpu_create_pr(struct kvm *kvm,

err = kvmppc_mmu_init(vcpu);
if (err < 0)
- goto uninit_vcpu;
+ goto free_shared_page;

return vcpu;

+free_shared_page:
+ free_page((unsigned long)vcpu->arch.shared);
uninit_vcpu:
kvm_vcpu_uninit(vcpu);
free_shadow_vcpu:
--
2.22.0

2019-10-25 12:42:59

by Greg Kurz

Subject: Re: [PATCH 02/45] KVM: PPC: Book3S PR: Free shared page if mmu initialization fails

On Mon, 21 Oct 2019 18:58:42 -0700
Sean Christopherson <[email protected]> wrote:

> Explicitly free the shared page if kvmppc_mmu_init() fails during
> kvmppc_core_vcpu_create(), as the page is freed only in
> kvmppc_core_vcpu_free(), which is not reached via kvm_vcpu_uninit().
>
> Fixes: 96bc451a15329 ("KVM: PPC: Introduce shared page")
> Cc: [email protected]
> Signed-off-by: Sean Christopherson <[email protected]>
> ---

Reviewed-by: Greg Kurz <[email protected]>

> arch/powerpc/kvm/book3s_pr.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c
> index cc65af8fe6f7..3f6ad3f58628 100644
> --- a/arch/powerpc/kvm/book3s_pr.c
> +++ b/arch/powerpc/kvm/book3s_pr.c
> @@ -1769,10 +1769,12 @@ static struct kvm_vcpu *kvmppc_core_vcpu_create_pr(struct kvm *kvm,
>
> err = kvmppc_mmu_init(vcpu);
> if (err < 0)
> - goto uninit_vcpu;
> + goto free_shared_page;
>
> return vcpu;
>
> +free_shared_page:
> + free_page((unsigned long)vcpu->arch.shared);
> uninit_vcpu:
> kvm_vcpu_uninit(vcpu);
> free_shadow_vcpu: