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| author | Paul Durrant <pdurrant@amazon.com> | 2024-02-15 15:28:58 +0000 |
|---|---|---|
| committer | Sean Christopherson <seanjc@google.com> | 2024-02-20 07:37:41 -0800 |
| commit | 4438355ec6e165f73357203e0792079dec9e3059 (patch) | |
| tree | 2e903ae58b7636480b70ca6d9e83a4ccdf5929cf | |
| parent | 41496fffc0e1276e1c41344ef38513d5353da3ca (diff) | |
| download | linux-stable-4438355ec6e165f73357203e0792079dec9e3059.tar.gz linux-stable-4438355ec6e165f73357203e0792079dec9e3059.tar.bz2 linux-stable-4438355ec6e165f73357203e0792079dec9e3059.zip | |
KVM: x86/xen: mark guest pages dirty with the pfncache lock held
Sampling gpa and memslot from an unlocked pfncache may yield inconsistent
values so, since there is no problem with calling mark_page_dirty_in_slot()
with the pfncache lock held, relocate the calls in
kvm_xen_update_runstate_guest() and kvm_xen_inject_pending_events()
accordingly.
Signed-off-by: Paul Durrant <pdurrant@amazon.com>
Reviewed-by: David Woodhouse <dwmw@amazon.co.uk>
Link: https://lore.kernel.org/r/20240215152916.1158-4-paul@xen.org
Signed-off-by: Sean Christopherson <seanjc@google.com>
| -rw-r--r-- | arch/x86/kvm/xen.c | 13 |
1 files changed, 6 insertions, 7 deletions
diff --git a/arch/x86/kvm/xen.c b/arch/x86/kvm/xen.c index 4b4e738c6f1b..f3327508ae41 100644 --- a/arch/x86/kvm/xen.c +++ b/arch/x86/kvm/xen.c @@ -452,14 +452,13 @@ static void kvm_xen_update_runstate_guest(struct kvm_vcpu *v, bool atomic) smp_wmb(); } - if (user_len2) + if (user_len2) { + mark_page_dirty_in_slot(v->kvm, gpc2->memslot, gpc2->gpa >> PAGE_SHIFT); read_unlock(&gpc2->lock); - - read_unlock_irqrestore(&gpc1->lock, flags); + } mark_page_dirty_in_slot(v->kvm, gpc1->memslot, gpc1->gpa >> PAGE_SHIFT); - if (user_len2) - mark_page_dirty_in_slot(v->kvm, gpc2->memslot, gpc2->gpa >> PAGE_SHIFT); + read_unlock_irqrestore(&gpc1->lock, flags); } void kvm_xen_update_runstate(struct kvm_vcpu *v, int state) @@ -565,13 +564,13 @@ void kvm_xen_inject_pending_events(struct kvm_vcpu *v) : "0" (evtchn_pending_sel32)); WRITE_ONCE(vi->evtchn_upcall_pending, 1); } + + mark_page_dirty_in_slot(v->kvm, gpc->memslot, gpc->gpa >> PAGE_SHIFT); read_unlock_irqrestore(&gpc->lock, flags); /* For the per-vCPU lapic vector, deliver it as MSI. */ if (v->arch.xen.upcall_vector) kvm_xen_inject_vcpu_vector(v); - - mark_page_dirty_in_slot(v->kvm, gpc->memslot, gpc->gpa >> PAGE_SHIFT); } int __kvm_xen_has_interrupt(struct kvm_vcpu *v) |