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From: Vitaly Kuznetsov <vkuznets@redhat.com>
To: kvm@vger.kernel.org
Cc: linux-kernel@vger.kernel.org,
	"Paolo Bonzini" <pbonzini@redhat.com>,
	"Radim Krčmář" <rkrcmar@redhat.com>,
	"Joerg Roedel" <joro@8bytes.org>,
	"Jim Mattson" <jmattson@google.com>
Subject: [PATCH RFC 4/5] x86: KVM: add xsetbv to the emulator
Date: Thu, 20 Jun 2019 13:02:39 +0200	[thread overview]
Message-ID: <20190620110240.25799-5-vkuznets@redhat.com> (raw)
In-Reply-To: <20190620110240.25799-1-vkuznets@redhat.com>

To avoid hardcoding xsetbv length to '3' we need to support decoding it in
the emulator.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
---
 arch/x86/include/asm/kvm_emulate.h | 1 +
 arch/x86/kvm/emulate.c             | 9 ++++++++-
 arch/x86/kvm/svm.c                 | 1 +
 3 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/kvm_emulate.h b/arch/x86/include/asm/kvm_emulate.h
index feab24cac610..478f76b0122d 100644
--- a/arch/x86/include/asm/kvm_emulate.h
+++ b/arch/x86/include/asm/kvm_emulate.h
@@ -429,6 +429,7 @@ enum x86_intercept {
 	x86_intercept_ins,
 	x86_intercept_out,
 	x86_intercept_outs,
+	x86_intercept_xsetbv,
 
 	nr_x86_intercepts
 };
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index d0d5dd44b4f4..ff25d94df684 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -4393,6 +4393,12 @@ static const struct opcode group7_rm1[] = {
 	N, N, N, N, N, N,
 };
 
+static const struct opcode group7_rm2[] = {
+	N,
+	DI(SrcNone | Priv, xsetbv),
+	N, N, N, N, N, N,
+};
+
 static const struct opcode group7_rm3[] = {
 	DIP(SrcNone | Prot | Priv,		vmrun,		check_svme_pa),
 	II(SrcNone  | Prot | EmulateOnUD,	em_hypercall,	vmmcall),
@@ -4482,7 +4488,8 @@ static const struct group_dual group7 = { {
 }, {
 	EXT(0, group7_rm0),
 	EXT(0, group7_rm1),
-	N, EXT(0, group7_rm3),
+	EXT(0, group7_rm2),
+	EXT(0, group7_rm3),
 	II(SrcNone | DstMem | Mov,		em_smsw, smsw), N,
 	II(SrcMem16 | Mov | Priv,		em_lmsw, lmsw),
 	EXT(0, group7_rm7),
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index f980fc43372d..39e61029f401 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -6041,6 +6041,7 @@ static const struct __x86_intercept {
 	[x86_intercept_ins]		= POST_EX(SVM_EXIT_IOIO),
 	[x86_intercept_out]		= POST_EX(SVM_EXIT_IOIO),
 	[x86_intercept_outs]		= POST_EX(SVM_EXIT_IOIO),
+	[x86_intercept_xsetbv]		= PRE_EX(SVM_EXIT_XSETBV),
 };
 
 #undef PRE_EX
-- 
2.20.1


  parent reply	other threads:[~2019-06-20 11:02 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-20 11:02 [PATCH RFC 0/5] x86/KVM/svm: get rid of hardcoded instructions lengths Vitaly Kuznetsov
2019-06-20 11:02 ` [PATCH RFC 1/5] x86: KVM: svm: don't pretend to advance RIP in case wrmsr_interception() results in #GP Vitaly Kuznetsov
2019-06-20 18:49   ` Jim Mattson
2019-06-21  8:42     ` Vitaly Kuznetsov
2019-06-20 11:02 ` [PATCH RFC 2/5] x86: KVM: svm: avoid flooding logs when skip_emulated_instruction() fails Vitaly Kuznetsov
2019-06-20 18:45   ` Jim Mattson
2019-06-20 11:02 ` [PATCH RFC 3/5] x86: KVM: svm: clear interrupt shadow on all paths in skip_emulated_instruction() Vitaly Kuznetsov
2019-06-20 18:44   ` Jim Mattson
2019-06-21  8:43     ` Vitaly Kuznetsov
2019-07-31 13:50     ` Vitaly Kuznetsov
2019-07-31 16:37       ` Paolo Bonzini
2019-07-31 20:27         ` Jim Mattson
2019-07-31 23:37           ` Sean Christopherson
2019-07-31 23:45             ` Jim Mattson
2019-07-31 23:56               ` Sean Christopherson
2019-08-01  0:13                 ` Paolo Bonzini
2019-08-01  0:17                   ` Jim Mattson
2019-06-20 11:02 ` Vitaly Kuznetsov [this message]
2019-06-20 12:18   ` [PATCH RFC 4/5] x86: KVM: add xsetbv to the emulator Paolo Bonzini
2019-07-31 13:07     ` Vitaly Kuznetsov
2019-07-31 13:14       ` Paolo Bonzini
2019-06-20 11:02 ` [PATCH RFC 5/5] x86: KVM: svm: remove hardcoded instruction length from intercepts Vitaly Kuznetsov
2019-06-20 18:41   ` Jim Mattson
2019-06-20 12:14 ` [PATCH RFC 0/5] x86/KVM/svm: get rid of hardcoded instructions lengths Paolo Bonzini
2019-06-20 12:26   ` Vitaly Kuznetsov

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