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authorPaul Mackerras <paulus@ozlabs.org>2019-12-18 03:43:06 +0300
committerPaul Mackerras <paulus@ozlabs.org>2019-12-18 07:46:34 +0300
commitd89c69f42bf0fe42d1f52ea9b3dca15b1ade7601 (patch)
treea1a27270ba9f4cc28303477f42c41433e1221777 /arch
parent7d73710d9ca2564f29d291d0b3badc09efdf25e9 (diff)
downloadlinux-d89c69f42bf0fe42d1f52ea9b3dca15b1ade7601.tar.xz
KVM: PPC: Book3S HV: Don't do ultravisor calls on systems without ultravisor
Commit 22945688acd4 ("KVM: PPC: Book3S HV: Support reset of secure guest") added a call to uv_svm_terminate, which is an ultravisor call, without any check that the guest is a secure guest or even that the system has an ultravisor. On a system without an ultravisor, the ultracall will degenerate to a hypercall, but since we are not in KVM guest context, the hypercall will get treated as a system call, which could have random effects depending on what happens to be in r0, and could also corrupt the current task's kernel stack. Hence this adds a test for the guest being a secure guest before doing uv_svm_terminate(). Fixes: 22945688acd4 ("KVM: PPC: Book3S HV: Support reset of secure guest") Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/powerpc/kvm/book3s_hv.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index dc53578193ee..6ff3f896d908 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -4983,7 +4983,8 @@ static void kvmppc_core_destroy_vm_hv(struct kvm *kvm)
if (nesting_enabled(kvm))
kvmhv_release_all_nested(kvm);
kvm->arch.process_table = 0;
- uv_svm_terminate(kvm->arch.lpid);
+ if (kvm->arch.secure_guest)
+ uv_svm_terminate(kvm->arch.lpid);
kvmhv_set_ptbl_entry(kvm->arch.lpid, 0, 0);
}