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[PATCH 2/4] target/i386: Added VGIF V_IRQ masking capability
From: |
Lara Lazier |
Subject: |
[PATCH 2/4] target/i386: Added VGIF V_IRQ masking capability |
Date: |
Wed, 18 Aug 2021 09:08:36 +0200 |
VGIF provides masking capability for when virtual interrupts
are taken. (APM2)
Signed-off-by: Lara Lazier <laramglazier@gmail.com>
---
target/i386/cpu.c | 7 +++++--
target/i386/cpu.h | 2 ++
target/i386/tcg/sysemu/svm_helper.c | 12 ++++++++++++
3 files changed, 19 insertions(+), 2 deletions(-)
diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index 5dcdab3b80..b2094175d9 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -5649,6 +5649,7 @@ static void x86_cpu_reset(DeviceState *dev)
/* init to reset state */
env->int_ctl = 0;
env->hflags2 |= HF2_GIF_MASK;
+ env->hflags2 |= HF2_VGIF_MASK;
env->hflags &= ~HF_GUEST_MASK;
cpu_x86_update_cr0(env, 0x60000010);
@@ -6532,10 +6533,12 @@ int x86_cpu_pending_interrupt(CPUState *cs, int
interrupt_request)
!(env->hflags & HF_INHIBIT_IRQ_MASK))))) {
return CPU_INTERRUPT_HARD;
#if !defined(CONFIG_USER_ONLY)
- } else if ((interrupt_request & CPU_INTERRUPT_VIRQ) &&
+ } else if (env->hflags2 & HF2_VGIF_MASK) {
+ if((interrupt_request & CPU_INTERRUPT_VIRQ) &&
(env->eflags & IF_MASK) &&
!(env->hflags & HF_INHIBIT_IRQ_MASK)) {
- return CPU_INTERRUPT_VIRQ;
+ return CPU_INTERRUPT_VIRQ;
+ }
#endif
}
}
diff --git a/target/i386/cpu.h b/target/i386/cpu.h
index e27a1aab99..d26df6de6b 100644
--- a/target/i386/cpu.h
+++ b/target/i386/cpu.h
@@ -203,6 +203,7 @@ typedef enum X86Seg {
#define HF2_MPX_PR_SHIFT 5 /* BNDCFGx.BNDPRESERVE */
#define HF2_NPT_SHIFT 6 /* Nested Paging enabled */
#define HF2_IGNNE_SHIFT 7 /* Ignore CR0.NE=0 */
+#define HF2_VGIF_SHIFT 8 /* Can take VIRQ*/
#define HF2_GIF_MASK (1 << HF2_GIF_SHIFT)
#define HF2_HIF_MASK (1 << HF2_HIF_SHIFT)
@@ -212,6 +213,7 @@ typedef enum X86Seg {
#define HF2_MPX_PR_MASK (1 << HF2_MPX_PR_SHIFT)
#define HF2_NPT_MASK (1 << HF2_NPT_SHIFT)
#define HF2_IGNNE_MASK (1 << HF2_IGNNE_SHIFT)
+#define HF2_VGIF_MASK (1 << HF2_VGIF_SHIFT)
#define CR0_PE_SHIFT 0
#define CR0_MP_SHIFT 1
diff --git a/target/i386/tcg/sysemu/svm_helper.c
b/target/i386/tcg/sysemu/svm_helper.c
index 9ef2454779..2c44bdb243 100644
--- a/target/i386/tcg/sysemu/svm_helper.c
+++ b/target/i386/tcg/sysemu/svm_helper.c
@@ -130,6 +130,11 @@ static inline bool virtual_gif_enabled(CPUX86State *env)
return false;
}
+static inline bool virtual_gif_set(CPUX86State *env)
+{
+ return !virtual_gif_enabled(env) || (env->int_ctl & V_GIF_MASK);
+}
+
void helper_vmrun(CPUX86State *env, int aflag, int next_eip_addend)
{
CPUState *cs = env_cpu(env);
@@ -363,6 +368,10 @@ void helper_vmrun(CPUX86State *env, int aflag, int
next_eip_addend)
cs->interrupt_request |= CPU_INTERRUPT_VIRQ;
}
+ if (virtual_gif_set(env)) {
+ env->hflags2 |= HF2_VGIF_MASK;
+ }
+
/* maybe we need to inject an event */
event_inj = x86_ldl_phys(cs, env->vm_vmcb + offsetof(struct vmcb,
control.event_inj));
@@ -519,6 +528,7 @@ void helper_stgi(CPUX86State *env)
if (virtual_gif_enabled(env)) {
env->int_ctl |= V_GIF_MASK;
+ env->hflags2 |= HF2_VGIF_MASK;
} else {
env->hflags2 |= HF2_GIF_MASK;
}
@@ -530,6 +540,7 @@ void helper_clgi(CPUX86State *env)
if (virtual_gif_enabled(env)) {
env->int_ctl &= ~V_GIF_MASK;
+ env->hflags2 &= ~HF2_VGIF_MASK;
} else {
env->hflags2 &= ~HF2_GIF_MASK;
}
@@ -811,6 +822,7 @@ void do_vmexit(CPUX86State *env)
env->vm_vmcb + offsetof(struct vmcb, control.event_inj), 0);
env->hflags2 &= ~HF2_GIF_MASK;
+ env->hflags2 &= ~HF2_VGIF_MASK;
/* FIXME: Resets the current ASID register to zero (host ASID). */
/* Clears the V_IRQ and V_INTR_MASKING bits inside the processor. */
--
2.25.1