linux-kernel - [PATCH 11/39] KVM: VMX: Add invalid guest state handler

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Thu, 25 Sep 2008 14:54:43 +0300
From:	Avi Kivity <avi@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	kvm@...r.kernel.org, Mohammed Gamal <m.gamal005@...il.com>
Subject: [PATCH 11/39] KVM: VMX: Add invalid guest state handler

From: Mohammed Gamal <m.gamal005@...il.com>

This adds the invalid guest state handler function which invokes the x86
emulator until getting the guest to a VMX-friendly state.

[avi: leave atomic context if scheduling]
[guillaume: return to atomic context correctly]

Signed-off-by: Laurent Vivier <laurent.vivier@...l.net>
Signed-off-by: Guillaume Thouvenin <guillaume.thouvenin@....bull.net>
Signed-off-by: Mohammed Gamal <m.gamal005@...il.com>
Signed-off-by: Avi Kivity <avi@...ranet.com>
---
 arch/x86/kvm/vmx.c |   37 +++++++++++++++++++++++++++++++++++++
 1 files changed, 37 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 7c5f611..eae1f2c 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -2892,6 +2892,43 @@ static int handle_nmi_window(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
 	return 1;
 }
 
+static void handle_invalid_guest_state(struct kvm_vcpu *vcpu,
+				struct kvm_run *kvm_run)
+{
+	struct vcpu_vmx *vmx = to_vmx(vcpu);
+	int err;
+
+	preempt_enable();
+	local_irq_enable();
+
+	while (!guest_state_valid(vcpu)) {
+		err = emulate_instruction(vcpu, kvm_run, 0, 0, 0);
+
+		switch (err) {
+			case EMULATE_DONE:
+				break;
+			case EMULATE_DO_MMIO:
+				kvm_report_emulation_failure(vcpu, "mmio");
+				/* TODO: Handle MMIO */
+				return;
+			default:
+				kvm_report_emulation_failure(vcpu, "emulation failure");
+				return;
+		}
+
+		if (signal_pending(current))
+			break;
+		if (need_resched())
+			schedule();
+	}
+
+	local_irq_disable();
+	preempt_disable();
+
+	/* Guest state should be valid now, no more emulation should be needed */
+	vmx->emulation_required = 0;
+}
+
 /*
  * The exit handlers return 1 if the exit was handled fully and guest execution
  * may resume.  Otherwise they set the kvm_run parameter to indicate what needs
-- 
1.6.0.1

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/