All of lore.kernel.org
 help / color / mirror / Atom feed
From: Joerg Roedel <joerg.roedel@amd.com>
To: Avi Kivity <avi@redhat.com>, Marcelo Tosatti <mtosatti@redhat.com>
Cc: <kvm@vger.kernel.org>, Joerg Roedel <joerg.roedel@amd.com>
Subject: [PATCH 06/15] KVM: x86: Add x86 callback for intercept check
Date: Fri, 1 Apr 2011 16:10:15 +0200	[thread overview]
Message-ID: <1301667024-29420-7-git-send-email-joerg.roedel@amd.com> (raw)
In-Reply-To: <1301667024-29420-1-git-send-email-joerg.roedel@amd.com>

This patch adds a callback into kvm_x86_ops so that svm and
vmx code can do intercept checks on emulated instructions.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---
 arch/x86/include/asm/kvm_emulate.h |   22 ++++++++++++++++++++--
 arch/x86/include/asm/kvm_host.h    |    7 +++++++
 arch/x86/kvm/emulate.c             |   32 ++++++++++++++++++++++++++------
 arch/x86/kvm/svm.c                 |    9 +++++++++
 arch/x86/kvm/vmx.c                 |    9 +++++++++
 arch/x86/kvm/x86.c                 |    6 +++---
 6 files changed, 74 insertions(+), 11 deletions(-)

diff --git a/arch/x86/include/asm/kvm_emulate.h b/arch/x86/include/asm/kvm_emulate.h
index dfca25b..6ac4f64 100644
--- a/arch/x86/include/asm/kvm_emulate.h
+++ b/arch/x86/include/asm/kvm_emulate.h
@@ -26,6 +26,24 @@ struct x86_exception {
 };
 
 /*
+ * This struct is used to carry enough information from the instruction
+ * decoder to main KVM so that a decision can be made whether the
+ * instruction needs to be intercepted or not.
+ */
+struct x86_instruction_info {
+	u8  intercept;          /* which intercept                      */
+	u8  rep_prefix;         /* rep prefix?                          */
+	u8  modrm_mod;		/* mod part of modrm			*/
+	u8  modrm_reg;          /* index of register used               */
+	u8  modrm_rm;		/* rm part of modrm			*/
+	u64 src_val;            /* value of source operand              */
+	u8  src_bytes;          /* size of source operand               */
+	u8  dst_bytes;          /* size of destination operand          */
+	u8  ad_bytes;           /* size of src/dst address              */
+	u64 next_rip;           /* rip following the instruction        */
+};
+
+/*
  * x86_emulate_ops:
  *
  * These operations represent the instruction emulator's interface to memory.
@@ -161,8 +179,8 @@ struct x86_emulate_ops {
 	int (*set_dr)(int dr, unsigned long value, struct kvm_vcpu *vcpu);
 	int (*set_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 data);
 	int (*get_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata);
-	int (*intercept)(struct x86_emulate_ctxt *ctxt,
-			 enum x86_intercept intercept,
+	int (*intercept)(struct kvm_vcpu *vcpu,
+			 struct x86_instruction_info *info,
 			 enum x86_intercept_stage stage);
 };
 
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 35f81b1..4ef32ac 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -504,6 +504,8 @@ struct kvm_vcpu_stat {
 	u32 nmi_injections;
 };
 
+struct x86_instruction_info;
+
 struct kvm_x86_ops {
 	int (*cpu_has_kvm_support)(void);          /* __init */
 	int (*disabled_by_bios)(void);             /* __init */
@@ -591,6 +593,11 @@ struct kvm_x86_ops {
 	void (*write_tsc_offset)(struct kvm_vcpu *vcpu, u64 offset);
 
 	void (*get_exit_info)(struct kvm_vcpu *vcpu, u64 *info1, u64 *info2);
+
+	int (*check_intercept)(struct kvm_vcpu *vcpu,
+			       struct x86_instruction_info *info,
+			       enum x86_intercept_stage stage);
+
 	const struct trace_print_flags *exit_reasons_str;
 };
 
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 63f775f..588fd18 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -398,6 +398,26 @@ struct group_dual {
 	(_eip) += (_size);						\
 })
 
+static int emulator_check_intercept(struct x86_emulate_ctxt *ctxt,
+				    enum x86_intercept intercept,
+				    enum x86_intercept_stage stage)
+{
+	struct x86_instruction_info info = {
+		.intercept  = intercept,
+		.rep_prefix = ctxt->decode.rep_prefix,
+		.modrm_mod  = ctxt->decode.modrm_mod,
+		.modrm_reg  = ctxt->decode.modrm_reg,
+		.modrm_rm   = ctxt->decode.modrm_rm,
+		.src_val    = ctxt->decode.src.val64,
+		.src_bytes  = ctxt->decode.src.bytes,
+		.dst_bytes  = ctxt->decode.dst.bytes,
+		.ad_bytes   = ctxt->decode.ad_bytes,
+		.next_rip   = ctxt->eip,
+	};
+
+	return ctxt->ops->intercept(ctxt->vcpu, &info, stage);
+}
+
 static inline unsigned long ad_mask(struct decode_cache *c)
 {
 	return (1UL << (c->ad_bytes << 3)) - 1;
@@ -2997,8 +3017,8 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt)
 	}
 
 	if (unlikely(ctxt->guest_mode) && c->intercept) {
-		rc = ops->intercept(ctxt, c->intercept,
-				    X86_ICPT_PRE_EXCEPT);
+		rc = emulator_check_intercept(ctxt, c->intercept,
+					      X86_ICPT_PRE_EXCEPT);
 		if (rc != X86EMUL_CONTINUE)
 			goto done;
 	}
@@ -3023,8 +3043,8 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt)
 	}
 
 	if (unlikely(ctxt->guest_mode) && c->intercept) {
-		rc = ops->intercept(ctxt, c->intercept,
-				    X86_ICPT_POST_EXCEPT);
+		rc = emulator_check_intercept(ctxt, c->intercept,
+					      X86_ICPT_POST_EXCEPT);
 		if (rc != X86EMUL_CONTINUE)
 			goto done;
 	}
@@ -3068,8 +3088,8 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt)
 special_insn:
 
 	if (unlikely(ctxt->guest_mode) && c->intercept) {
-		rc = ops->intercept(ctxt, c->intercept,
-				    X86_ICPT_POST_MEMACCESS);
+		rc = emulator_check_intercept(ctxt, c->intercept,
+					      X86_ICPT_POST_MEMACCESS);
 		if (rc != X86EMUL_CONTINUE)
 			goto done;
 	}
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index cb43e98..798ebe6 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -3868,6 +3868,13 @@ static void svm_fpu_deactivate(struct kvm_vcpu *vcpu)
 	update_cr0_intercept(svm);
 }
 
+static int svm_check_intercept(struct kvm_vcpu *vcpu,
+			       struct x86_instruction_info *info,
+			       enum x86_intercept_stage stage)
+{
+	return X86EMUL_CONTINUE;
+}
+
 static struct kvm_x86_ops svm_x86_ops = {
 	.cpu_has_kvm_support = has_svm,
 	.disabled_by_bios = is_disabled,
@@ -3953,6 +3960,8 @@ static struct kvm_x86_ops svm_x86_ops = {
 	.adjust_tsc_offset = svm_adjust_tsc_offset,
 
 	.set_tdp_cr3 = set_tdp_cr3,
+
+	.check_intercept = svm_check_intercept,
 };
 
 static int __init svm_init(void)
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 2b99ae7..3dfefe3 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -4409,6 +4409,13 @@ static void vmx_set_supported_cpuid(u32 func, struct kvm_cpuid_entry2 *entry)
 {
 }
 
+static int vmx_check_intercept(struct kvm_vcpu *vcpu,
+			       struct x86_instruction_info *info,
+			       enum x86_intercept_stage stage)
+{
+	return X86EMUL_CONTINUE;
+}
+
 static struct kvm_x86_ops vmx_x86_ops = {
 	.cpu_has_kvm_support = cpu_has_kvm_support,
 	.disabled_by_bios = vmx_disabled_by_bios,
@@ -4494,6 +4501,8 @@ static struct kvm_x86_ops vmx_x86_ops = {
 	.adjust_tsc_offset = vmx_adjust_tsc_offset,
 
 	.set_tdp_cr3 = vmx_set_cr3,
+
+	.check_intercept = vmx_check_intercept,
 };
 
 static int __init vmx_init(void)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 292b158..2b43606 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -4242,11 +4242,11 @@ static void emulator_set_segment_selector(u16 sel, int seg,
 	kvm_set_segment(vcpu, &kvm_seg, seg);
 }
 
-static int emulator_intercept(struct x86_emulate_ctxt *ctxt,
-			      enum x86_intercept intercept,
+static int emulator_intercept(struct kvm_vcpu *vcpu,
+			      struct x86_instruction_info *info,
 			      enum x86_intercept_stage stage)
 {
-	return X86EMUL_CONTINUE;
+	return kvm_x86_ops->check_intercept(vcpu, info, stage);
 }
 
 static struct x86_emulate_ops emulate_ops = {
-- 
1.7.1



  parent reply	other threads:[~2011-04-01 14:10 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-04-01 14:10 [PATCH 0/15] KVM: Make the instruction emulator aware of Nested Virtualization v4 Joerg Roedel
2011-04-01 14:10 ` [PATCH 01/15] KVM: x86 emulator: add framework for instruction intercepts Joerg Roedel
2011-04-01 14:10 ` [PATCH 02/15] KVM: x86 emulator: add SVM intercepts Joerg Roedel
2011-04-01 14:10 ` [PATCH 03/15] KVM: x86 emulator: Don't write-back cpu-state on X86EMUL_INTERCEPTED Joerg Roedel
2011-04-01 14:10 ` [PATCH 04/15] KVM: x86 emulator: Add check_perm callback Joerg Roedel
2011-04-03 12:35   ` Avi Kivity
2011-04-04 10:23     ` Roedel, Joerg
2011-04-01 14:10 ` [PATCH 05/15] KVM: x86 emulator: Add flag to check for protected mode instructions Joerg Roedel
2011-04-01 14:10 ` Joerg Roedel [this message]
2011-04-01 14:10 ` [PATCH 07/15] KVM: SVM: Add intercept check for emulated cr accesses Joerg Roedel
2011-04-01 14:10 ` [PATCH 08/15] KVM: SVM: Add intercept check for accessing dr registers Joerg Roedel
2011-04-01 14:10 ` [PATCH 09/15] KVM: SVM: Add intercept checks for descriptor table accesses Joerg Roedel
2011-04-01 14:10 ` [PATCH 10/15] KVM: SVM: Add intercept checks for SVM instructions Joerg Roedel
2011-04-01 14:10 ` [PATCH 11/15] KVM: SVM: Add intercept checks for remaining group7 instructions Joerg Roedel
2011-04-01 14:10 ` [PATCH 12/15] KVM: SVM: Add intercept checks for remaining twobyte instructions Joerg Roedel
2011-04-01 14:10 ` [PATCH 13/15] KVM: SVM: Add intercept checks for one-byte instructions Joerg Roedel
2011-04-01 14:10 ` [PATCH 14/15] KVM: SVM: Add checks for IO instructions Joerg Roedel
2011-04-01 14:10 ` [PATCH 15/15] KVM: SVM: Remove nested sel_cr0_write handling code Joerg Roedel
2011-04-03 12:42 ` [PATCH 0/15] KVM: Make the instruction emulator aware of Nested Virtualization v4 Avi Kivity
2011-04-04 10:39 [PATCH 0/15] KVM: Make the instruction emulator aware of Nested Virtualization v5 Joerg Roedel
2011-04-04 10:39 ` [PATCH 06/15] KVM: x86: Add x86 callback for intercept check Joerg Roedel

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=1301667024-29420-7-git-send-email-joerg.roedel@amd.com \
    --to=joerg.roedel@amd.com \
    --cc=avi@redhat.com \
    --cc=kvm@vger.kernel.org \
    --cc=mtosatti@redhat.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.