linux-kernel - [PATCH 4/7] KVM: vmx: set rflags.rf during fault injection

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Message-Id: <1405942650-22589-5-git-send-email-namit@cs.technion.ac.il>
Date:	Mon, 21 Jul 2014 14:37:27 +0300
From:	Nadav Amit <namit@...technion.ac.il>
To:	pbonzini@...hat.com
Cc:	tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
	x86@...nel.org, gleb@...nel.org, linux-kernel@...r.kernel.org,
	Nadav Amit <namit@...technion.ac.il>
Subject: [PATCH 4/7] KVM: vmx: set rflags.rf during fault injection

VMX does not automatically set rflags.rf during event injection. This patch
does partial job, setting rflags.rf upon fault injection.  It also marks that
injection of trap/interrupt during rep-string instruction is not properly
emulated. It is unclear how to do it efficiently without decoding the guest
instruction before interrupt injection.

Signed-off-by: Nadav Amit <namit@...technion.ac.il>
---
 arch/x86/kvm/vmx.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 0c9569b..8edb785 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -2006,6 +2006,7 @@ static void vmx_queue_exception(struct kvm_vcpu *vcpu, unsigned nr,
 				bool reinject)
 {
 	struct vcpu_vmx *vmx = to_vmx(vcpu);
+	unsigned long rflags;
 	u32 intr_info = nr | INTR_INFO_VALID_MASK;
 
 	if (!reinject && is_guest_mode(vcpu) &&
@@ -2017,6 +2018,12 @@ static void vmx_queue_exception(struct kvm_vcpu *vcpu, unsigned nr,
 		intr_info |= INTR_INFO_DELIVER_CODE_MASK;
 	}
 
+	rflags = vmx_get_rflags(vcpu);
+	if (kvm_exception_type(nr) == EXCPT_FAULT)
+		vmx_set_rflags(vcpu, rflags | X86_EFLAGS_RF);
+
+	/* TODO: Set rflags.rf on trap during rep-string */
+
 	if (vmx->rmode.vm86_active) {
 		int inc_eip = 0;
 		if (kvm_exception_is_soft(nr))
@@ -4631,8 +4638,10 @@ static void vmx_inject_irq(struct kvm_vcpu *vcpu)
 		intr |= INTR_TYPE_SOFT_INTR;
 		vmcs_write32(VM_ENTRY_INSTRUCTION_LEN,
 			     vmx->vcpu.arch.event_exit_inst_len);
-	} else
+	} else {
+		/* TODO: Set rflags.rf during rep-string */
 		intr |= INTR_TYPE_EXT_INTR;
+	}
 	vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, intr);
 }
 
-- 
1.9.1

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