[PATCH v6 5/9] KVM: x86: Add support for vICR APIC-write VM-Exits in x2APIC mode

[Zeng Guang <guang.zeng@intel.com>]

Upcoming Intel CPUs will support virtual x2APIC MSR writes to the vICR,
i.e. will trap and generate an APIC-write VM-Exit instead of intercepting
the WRMSR.  Add support for handling "nodecode" x2APIC writes, which
were previously impossible.

Note, x2APIC MSR writes are 64 bits wide.

Signed-off-by: Zeng Guang <guang.zeng@intel.com>
---
 arch/x86/kvm/lapic.c | 25 ++++++++++++++++++++++---
 1 file changed, 22 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index 629c116b0d3e..e4bcdab1fac0 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -67,6 +67,7 @@ static bool lapic_timer_advance_dynamic __read_mostly;
 #define LAPIC_TIMER_ADVANCE_NS_MAX     5000
 /* step-by-step approximation to mitigate fluctuation */
 #define LAPIC_TIMER_ADVANCE_ADJUST_STEP 8
+static int kvm_lapic_msr_read(struct kvm_lapic *apic, u32 reg, u64 *data);
 
 static inline void __kvm_lapic_set_reg(char *regs, int reg_off, u32 val)
 {
@@ -2227,10 +2228,28 @@ EXPORT_SYMBOL_GPL(kvm_lapic_set_eoi);
 /* emulate APIC access in a trap manner */
 void kvm_apic_write_nodecode(struct kvm_vcpu *vcpu, u32 offset)
 {
-	u32 val = kvm_lapic_get_reg(vcpu->arch.apic, offset);
+	struct kvm_lapic *apic = vcpu->arch.apic;
+	u64 val;
+
+	if (apic_x2apic_mode(apic)) {
+		/*
+		 * When guest APIC is in x2APIC mode and IPI virtualization
+		 * is enabled, accessing APIC_ICR may cause trap-like VM-exit
+		 * on Intel hardware. Other offsets are not possible.
+		 */
+		if (WARN_ON_ONCE(offset != APIC_ICR))
+			return;
 
-	/* TODO: optimize to just emulate side effect w/o one more write */
-	kvm_lapic_reg_write(vcpu->arch.apic, offset, val);
+		kvm_lapic_msr_read(apic, offset, &val);
+		if (val & APIC_ICR_BUSY)
+			kvm_x2apic_icr_write(apic, val);
+		else
+			kvm_apic_send_ipi(apic, (u32)val, (u32)(val >> 32));
+	} else {
+		val = kvm_lapic_get_reg(apic, offset);
+		/* TODO: optimize to just emulate side effect w/o one more write */
+		kvm_lapic_reg_write(apic, offset, (u32)val);
+	}
 }
 EXPORT_SYMBOL_GPL(kvm_apic_write_nodecode);
 
-- 
2.27.0