diff options
Diffstat (limited to 'KVM-x86-Prevent-host-from-panicking-on-shared-MSR-wr.patch')
| -rw-r--r-- | KVM-x86-Prevent-host-from-panicking-on-shared-MSR-wr.patch | 89 |
1 files changed, 0 insertions, 89 deletions
diff --git a/KVM-x86-Prevent-host-from-panicking-on-shared-MSR-wr.patch b/KVM-x86-Prevent-host-from-panicking-on-shared-MSR-wr.patch deleted file mode 100644 index d832e64cc..000000000 --- a/KVM-x86-Prevent-host-from-panicking-on-shared-MSR-wr.patch +++ /dev/null @@ -1,89 +0,0 @@ -From: Andy Honig <ahonig@google.com> -Date: Fri, 24 Oct 2014 17:07:13 +0200 -Subject: [PATCH] KVM: x86: Prevent host from panicking on shared MSR writes. - -The previous patch blocked invalid writes directly when the MSR -is written. As a precaution, prevent future similar mistakes by -gracefulling handle GPs caused by writes to shared MSRs. - -Cc: stable@vger.kernel.org -Signed-off-by: Andrew Honig <ahonig@google.com> -[Remove parts obsoleted by Nadav's patch. - Paolo] -Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> ---- - arch/x86/include/asm/kvm_host.h | 2 +- - arch/x86/kvm/vmx.c | 7 +++++-- - arch/x86/kvm/x86.c | 11 ++++++++--- - 3 files changed, 14 insertions(+), 6 deletions(-) - -diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h -index ccc94de4ac49..6ed0c30d6a0c 100644 ---- a/arch/x86/include/asm/kvm_host.h -+++ b/arch/x86/include/asm/kvm_host.h -@@ -1064,7 +1064,7 @@ void kvm_arch_mmu_notifier_invalidate_page(struct kvm *kvm, - unsigned long address); - - void kvm_define_shared_msr(unsigned index, u32 msr); --void kvm_set_shared_msr(unsigned index, u64 val, u64 mask); -+int kvm_set_shared_msr(unsigned index, u64 val, u64 mask); - - bool kvm_is_linear_rip(struct kvm_vcpu *vcpu, unsigned long linear_rip); - -diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c -index 148020a7dd98..7e2c098b59c9 100644 ---- a/arch/x86/kvm/vmx.c -+++ b/arch/x86/kvm/vmx.c -@@ -2659,12 +2659,15 @@ static int vmx_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info) - default: - msr = find_msr_entry(vmx, msr_index); - if (msr) { -+ u64 old_msr_data = msr->data; - msr->data = data; - if (msr - vmx->guest_msrs < vmx->save_nmsrs) { - preempt_disable(); -- kvm_set_shared_msr(msr->index, msr->data, -- msr->mask); -+ ret = kvm_set_shared_msr(msr->index, msr->data, -+ msr->mask); - preempt_enable(); -+ if (ret) -+ msr->data = old_msr_data; - } - break; - } -diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c -index 5a7195573a32..0033df32a745 100644 ---- a/arch/x86/kvm/x86.c -+++ b/arch/x86/kvm/x86.c -@@ -229,20 +229,25 @@ static void kvm_shared_msr_cpu_online(void) - shared_msr_update(i, shared_msrs_global.msrs[i]); - } - --void kvm_set_shared_msr(unsigned slot, u64 value, u64 mask) -+int kvm_set_shared_msr(unsigned slot, u64 value, u64 mask) - { - unsigned int cpu = smp_processor_id(); - struct kvm_shared_msrs *smsr = per_cpu_ptr(shared_msrs, cpu); -+ int err; - - if (((value ^ smsr->values[slot].curr) & mask) == 0) -- return; -+ return 0; - smsr->values[slot].curr = value; -- wrmsrl(shared_msrs_global.msrs[slot], value); -+ err = wrmsrl_safe(shared_msrs_global.msrs[slot], value); -+ if (err) -+ return 1; -+ - if (!smsr->registered) { - smsr->urn.on_user_return = kvm_on_user_return; - user_return_notifier_register(&smsr->urn); - smsr->registered = true; - } -+ return 0; - } - EXPORT_SYMBOL_GPL(kvm_set_shared_msr); - --- -1.9.3 - |