From: Paolo Bonzini <pbonzini@redhat.com>
To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org
Subject: [PATCH] KVM: x86: emulate reserved nops from 0f/18 to 0f/1f
Date: Fri, 15 May 2020 12:19:19 -0400 [thread overview]
Message-ID: <20200515161919.29249-1-pbonzini@redhat.com> (raw)
Instructions starting with 0f18 up to 0f1f are reserved nops, except those
that were assigned to MPX. These include the endbr markers used by CET.
List them correctly in the opcode table.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
arch/x86/kvm/emulate.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index de5476f8683e..d0e2825ae617 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -4800,8 +4800,12 @@ static const struct opcode twobyte_table[256] = {
GP(ModRM | DstReg | SrcMem | Mov | Sse, &pfx_0f_10_0f_11),
GP(ModRM | DstMem | SrcReg | Mov | Sse, &pfx_0f_10_0f_11),
N, N, N, N, N, N,
- D(ImplicitOps | ModRM | SrcMem | NoAccess),
- N, N, N, N, N, N, D(ImplicitOps | ModRM | SrcMem | NoAccess),
+ D(ImplicitOps | ModRM | SrcMem | NoAccess), /* 4 * prefetch + 4 * reserved NOP */
+ D(ImplicitOps | ModRM | SrcMem | NoAccess), N, N,
+ D(ImplicitOps | ModRM | SrcMem | NoAccess), /* 8 * reserved NOP */
+ D(ImplicitOps | ModRM | SrcMem | NoAccess), /* 8 * reserved NOP */
+ D(ImplicitOps | ModRM | SrcMem | NoAccess), /* 8 * reserved NOP */
+ D(ImplicitOps | ModRM | SrcMem | NoAccess), /* NOP + 7 * reserved NOP */
/* 0x20 - 0x2F */
DIP(ModRM | DstMem | Priv | Op3264 | NoMod, cr_read, check_cr_read),
DIP(ModRM | DstMem | Priv | Op3264 | NoMod, dr_read, check_dr_read),
--
2.18.2
next reply other threads:[~2020-05-15 16:19 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-15 16:19 Paolo Bonzini [this message]
2020-05-18 16:07 ` [PATCH] KVM: x86: emulate reserved nops from 0f/18 to 0f/1f Sean Christopherson
2020-05-18 17:37 ` Paolo Bonzini
2020-05-19 6:02 ` Sean Christopherson
2020-05-19 7:43 ` Paolo Bonzini
2020-05-19 7:55 ` Sean Christopherson
2020-05-19 8:06 ` Paolo Bonzini
2020-05-19 15:32 ` Sean Christopherson
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