From: Gleb Natapov <gleb@redhat.com>
To: avi@reshat.com
Cc: kvm@vger.kernel.org
Subject: [PATCH 2/3] Add new mode of instruction emulation: skip.
Date: Sun, 05 Apr 2009 10:53:21 +0300 [thread overview]
Message-ID: <20090405075321.17698.80325.stgit@trex.usersys.redhat.com> (raw)
In-Reply-To: <20090405075315.17698.75426.stgit@trex.usersys.redhat.com>
In the new mode instruction is decoded, but not executed. The EIP
is moved to point after the instruction.
Signed-off-by: Gleb Natapov <gleb@redhat.com>
---
arch/x86/include/asm/kvm_host.h | 1 +
arch/x86/kvm/x86.c | 5 +++++
2 files changed, 6 insertions(+), 0 deletions(-)
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 3fc4623..e672ca5 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -565,6 +565,7 @@ enum emulation_result {
#define EMULTYPE_NO_DECODE (1 << 0)
#define EMULTYPE_TRAP_UD (1 << 1)
+#define EMULTYPE_SKIP (1 << 2)
int emulate_instruction(struct kvm_vcpu *vcpu, struct kvm_run *run,
unsigned long cr2, u16 error_code, int emulation_type);
void kvm_report_emulation_failure(struct kvm_vcpu *cvpu, const char *context);
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 1d9a312..32c7b8f 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -2411,6 +2411,11 @@ int emulate_instruction(struct kvm_vcpu *vcpu,
}
}
+ if (emulation_type & EMULTYPE_SKIP) {
+ kvm_rip_write(vcpu, vcpu->arch.emulate_ctxt.decode.eip);
+ return EMULATE_DONE;
+ }
+
r = x86_emulate_insn(&vcpu->arch.emulate_ctxt, &emulate_ops);
if (vcpu->arch.pio.string)
next prev parent reply other threads:[~2009-04-05 7:53 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-04-05 7:53 [PATCH 1/3] Completely decode instruction in decoding stage Gleb Natapov
2009-04-05 7:53 ` Gleb Natapov [this message]
2009-04-05 7:53 ` [PATCH 3/3] [AMD] Skip instruction on a task switch only when appropriate Gleb Natapov
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