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From: Sean Christopherson <sean.j.christopherson@intel.com>
To: "Paolo Bonzini" <pbonzini@redhat.com>,
	"Radim Krčmář" <rkrcmar@redhat.com>
Cc: Sean Christopherson <sean.j.christopherson@intel.com>,
	Vitaly Kuznetsov <vkuznets@redhat.com>,
	Wanpeng Li <wanpengli@tencent.com>,
	Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
	kvm@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [RESEND PATCH 07/13] KVM: x86: Add explicit flag for forced emulation on #UD
Date: Thu, 22 Aug 2019 18:07:03 -0700	[thread overview]
Message-ID: <20190823010709.24879-8-sean.j.christopherson@intel.com> (raw)
In-Reply-To: <20190823010709.24879-1-sean.j.christopherson@intel.com>

Add an explicit emulation type for forced #UD emulation and use it to
detect that KVM should unconditionally inject a #UD instead of falling
into its standard emulation failure handling.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 arch/x86/include/asm/kvm_host.h | 1 +
 arch/x86/kvm/x86.c              | 5 +++--
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index d1d5b5ca1195..a38c93362945 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1318,6 +1318,7 @@ enum emulation_result {
 #define EMULTYPE_TRAP_UD	    (1 << 1)
 #define EMULTYPE_SKIP		    (1 << 2)
 #define EMULTYPE_ALLOW_RETRY	    (1 << 3)
+#define EMULTYPE_TRAP_UD_FORCED	    (1 << 4)
 #define EMULTYPE_VMWARE_GP	    (1 << 5)
 int kvm_emulate_instruction(struct kvm_vcpu *vcpu, int emulation_type);
 int kvm_emulate_instruction_from_buffer(struct kvm_vcpu *vcpu,
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 228ca71d5b01..a1f9e36b2d58 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -5337,7 +5337,7 @@ int handle_ud(struct kvm_vcpu *vcpu)
 				sig, sizeof(sig), &e) == 0 &&
 	    memcmp(sig, "\xf\xbkvm", sizeof(sig)) == 0) {
 		kvm_rip_write(vcpu, kvm_rip_read(vcpu) + sizeof(sig));
-		emul_type = 0;
+		emul_type = EMULTYPE_TRAP_UD_FORCED;
 	}
 
 	er = kvm_emulate_instruction(vcpu, emul_type);
@@ -6532,7 +6532,8 @@ int x86_emulate_instruction(struct kvm_vcpu *vcpu,
 		trace_kvm_emulate_insn_start(vcpu);
 		++vcpu->stat.insn_emulation;
 		if (r != EMULATION_OK)  {
-			if (emulation_type & EMULTYPE_TRAP_UD)
+			if ((emulation_type & EMULTYPE_TRAP_UD) ||
+			    (emulation_type & EMULTYPE_TRAP_UD_FORCED))
 				return EMULATE_FAIL;
 			if (reexecute_instruction(vcpu, cr2, write_fault_to_spt,
 						emulation_type))
-- 
2.22.0


  parent reply	other threads:[~2019-08-23  1:08 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-23  1:06 [RESEND PATCH 00/13] KVM: x86: Remove emulation_result enums Sean Christopherson
2019-08-23  1:06 ` [RESEND PATCH 01/13] KVM: x86: Relocate MMIO exit stats counting Sean Christopherson
2019-08-23  9:15   ` Vitaly Kuznetsov
2019-08-23 14:37     ` Sean Christopherson
2019-08-23  1:06 ` [RESEND PATCH 02/13] KVM: x86: Clean up handle_emulation_failure() Sean Christopherson
2019-08-23  9:23   ` Vitaly Kuznetsov
2019-08-23 12:58     ` Liran Alon
2019-08-23  1:06 ` [RESEND PATCH 03/13] KVM: x86: Refactor kvm_vcpu_do_singlestep() to remove out param Sean Christopherson
2019-08-23  9:32   ` Vitaly Kuznetsov
2019-08-23 13:05   ` Liran Alon
2019-08-23  1:07 ` [RESEND PATCH 04/13] KVM: x86: Drop EMULTYPE_NO_UD_ON_FAIL as a standalone type Sean Christopherson
2019-08-23  9:34   ` Vitaly Kuznetsov
2019-08-23 13:21   ` Liran Alon
2019-08-23 13:32     ` Liran Alon
2019-08-23 21:55       ` Sean Christopherson
2019-08-23  1:07 ` [RESEND PATCH 05/13] KVM: x86: Don't attempt VMWare emulation on #GP with non-zero error code Sean Christopherson
2019-08-23 11:51   ` Vitaly Kuznetsov
2019-08-23 13:23   ` Liran Alon
2019-08-23  1:07 ` [RESEND PATCH 06/13] KVM: x86: Move #GP injection for VMware into x86_emulate_instruction() Sean Christopherson
2019-08-23 12:27   ` Vitaly Kuznetsov
2019-08-23 13:30   ` Liran Alon
2019-08-23  1:07 ` Sean Christopherson [this message]
2019-08-23 13:47   ` [RESEND PATCH 07/13] KVM: x86: Add explicit flag for forced emulation on #UD Liran Alon
2019-08-23 14:44     ` Sean Christopherson
2019-08-23 15:31       ` Liran Alon
2019-08-23  1:07 ` [RESEND PATCH 08/13] KVM: x86: Move #UD injection for failed emulation into emulation code Sean Christopherson
2019-08-23 13:48   ` Liran Alon
2019-08-27 20:22     ` Sean Christopherson
2019-08-23  1:07 ` [RESEND PATCH 09/13] KVM: x86: Exit to userspace on emulation skip failure Sean Christopherson
2019-08-23  1:07 ` [RESEND PATCH 10/13] KVM: x86: Handle emulation failure directly in kvm_task_switch() Sean Christopherson
2019-08-23  1:07 ` [RESEND PATCH 11/13] KVM: x86: Move triple fault request into RM int injection Sean Christopherson
2019-08-23  1:07 ` [RESEND PATCH 12/13] KVM: VMX: Remove EMULATE_FAIL handling in handle_invalid_guest_state() Sean Christopherson
2019-08-23  1:07 ` [RESEND PATCH 13/13] KVM: x86: Remove emulation_result enums, EMULATE_{DONE,FAIL,USER_EXIT} Sean Christopherson

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