kvm_ioapic_scan_entry() needs to update tmr. The previous lapic tmr value
(old_tmr) needs to sync with ioapic to get an accurate updated tmr
value before the updating work.
Tested-by: Rongrong Liu <rongrongx.liu@xxxxxxxxx>
Signed-off-by: Yang Zhang <yang.z.zhang@xxxxxxxxx>
Signed-off-by: Wei Wang <wei.w.wang@xxxxxxxxx>
---
arch/x86/kvm/lapic.c | 19 +++++++++++++++++--
arch/x86/kvm/x86.c | 2 +-
2 files changed, 18 insertions(+), 3 deletions(-)
diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index 08e8a89..8c1162d 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -518,10 +518,25 @@ static void pv_eoi_clr_pending(struct kvm_vcpu *vcpu)
void kvm_apic_update_tmr(struct kvm_vcpu *vcpu, u32 *tmr)
{
struct kvm_lapic *apic = vcpu->arch.apic;
+ u32 irr;
+ u32 isr;
+ u32 old_tmr, new_tmr;
int i;
- for (i = 0; i < 8; i++)
- apic_set_reg(apic, APIC_TMR + 0x10 * i, tmr[i]);
+ /*
+ * The updated tmr value comes from level-triggerd interrupts that
+ * have already been delieverd to lapic and new coming ones which
+ * are pending in ioapic. According to the x86 spec, tmr is valid
+ * when irr or isr is set.
+ */
+ for (i = 0; i < 8; i++) {
+ irr = kvm_apic_get_reg(apic, APIC_IRR + 0x10 * i);
+ isr = kvm_apic_get_reg(apic, APIC_ISR + 0x10 * i);
+ old_tmr = kvm_apic_get_reg(apic, APIC_TMR + 0x10 * i);
+ new_tmr = (~(irr | isr) & tmr[i])
+ | ((irr | isr) & old_tmr);
+ apic_set_reg(apic, APIC_TMR + 0x10 * i, new_tmr);
+ }
}
static void apic_update_ppr(struct kvm_lapic *apic)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 5f5edb6..d401684 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -5991,8 +5991,8 @@ static void vcpu_scan_ioapic(struct kvm_vcpu *vcpu)
memset(tmr, 0, 32);
kvm_ioapic_scan_entry(vcpu, eoi_exit_bitmap, tmr);
- kvm_x86_ops->load_eoi_exitmap(vcpu, eoi_exit_bitmap);
kvm_apic_update_tmr(vcpu, tmr);
+ kvm_x86_ops->load_eoi_exitmap(vcpu, eoi_exit_bitmap);
}
/*
--
1.7.1
--
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