iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

kvm: svm/avic: fix off-by-one in checking host APIC ID

Browse Source 
commit c9bcd3e3335d0a29d89fabd2c385e1b989e6f1b0 upstream.

Current logic does not allow VCPU to be loaded onto CPU with
APIC ID 255. This should be allowed since the host physical APIC ID
field in the AVIC Physical APIC table entry is an 8-bit value,
and APIC ID 255 is valid in system with x2APIC enabled.
Instead, do not allow VCPU load if the host APIC ID cannot be
represented by an 8-bit value.

Also, use the more appropriate AVIC_PHYSICAL_ID_ENTRY_HOST_PHYSICAL_ID_MASK
instead of AVIC_MAX_PHYSICAL_ID_COUNT.

Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Suthikulpanit, Suravee 2019-05-14 15:49:52 +00:00 committed by Greg Kroah-Hartman
parent f740870e3b
commit 74d76947b1
1 changed files with 5 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
arch/x86/kvm/svm.c
View File

@ -1567,7 +1567,11 @@ static void avic_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
if (!kvm_vcpu_apicv_active(vcpu))
return;
if (WARN_ON(h_physical_id >= AVIC_MAX_PHYSICAL_ID_COUNT))
/*
* Since the host physical APIC id is 8 bits,
* we can support host APIC ID upto 255.
*/
if (WARN_ON(h_physical_id > AVIC_PHYSICAL_ID_ENTRY_HOST_PHYSICAL_ID_MASK))
return;
entry = READ_ONCE(*(svm->avic_physical_id_cache));