[PATCH v2] target/i386: Added V_INTR_PRIO check to virtual interrupts

From: Lara Lazier <laramglazier@gmail.com>
To: qemu-devel@nongnu.org
Cc: pbonzini@redhat.com, Lara Lazier <laramglazier@gmail.com>
Subject: [PATCH v2] target/i386: Added V_INTR_PRIO check to virtual interrupts
Date: Wed, 28 Jul 2021 12:17:21 +0200	[thread overview]
Message-ID: <20210728101721.26712-1-laramglazier@gmail.com> (raw)

v1->v2: Fixed Mask

The APM2 states that The processor takes a virtual INTR interrupt
if V_IRQ and V_INTR_PRIO indicate that there is a virtual interrupt pending
whose priority is greater than the value in V_TPR.

Signed-off-by: Lara Lazier <laramglazier@gmail.com>
---
 target/i386/tcg/sysemu/svm_helper.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/target/i386/tcg/sysemu/svm_helper.c b/target/i386/tcg/sysemu/svm_helper.c
index 72ea7c9a08..a3138e9f86 100644
--- a/target/i386/tcg/sysemu/svm_helper.c
+++ b/target/i386/tcg/sysemu/svm_helper.c
@@ -65,6 +65,16 @@ static inline void svm_load_seg_cache(CPUX86State *env, hwaddr addr,
                            sc->base, sc->limit, sc->flags);
 }
 
+static inline bool ctl_has_irq(uint32_t int_ctl)
+{
+    uint32_t int_prio;
+    uint32_t tpr;
+
+    int_prio = (int_ctl & V_INTR_PRIO_MASK) >> V_INTR_PRIO_SHIFT;
+    tpr = int_ctl & V_TPR_MASK;
+    return (int_ctl & V_IRQ_MASK) && (int_prio >= tpr);
+}
+
 static inline bool is_efer_invalid_state (CPUX86State *env)
 {
     if (!(env->efer & MSR_EFER_SVME)) {
@@ -365,7 +375,6 @@ void helper_vmrun(CPUX86State *env, int aflag, int next_eip_addend)
 
     if (ctl_has_irq(int_ctl)) {
         CPUState *cs = env_cpu(env);
-
         cs->interrupt_request |= CPU_INTERRUPT_VIRQ;
     }
 
-- 
2.25.1


