From: Takahiro Itazuri <itazur@amazon.com>
To: <kvm@vger.kernel.org>, <x86@kernel.org>
Cc: Sean Christopherson <seanjc@google.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
<linux-kernel@vger.kernel.org>,
"Takahiro Itazuri" <zulinx86@gmail.com>,
Takahiro Itazuri <itazur@amazon.com>
Subject: [PATCH 0/2] KVM: x86: Propagate AMD-specific IBRS bits to guests
Date: Mon, 27 Feb 2023 21:05:24 +0000 [thread overview]
Message-ID: <20230227210526.83182-1-itazur@amazon.com> (raw)
VMMs retrieve supported CPUID features via KVM_GET_SUPPORTED_CPUID to
construct CPUID information to be passed to KVM_SET_CPUID2. Most CPUID
feature bits related to speculative attacks are propagated from host
CPUID. But AMD processors have AMD-specific IBRS related bits in CPUID
Fn8000_0008_EBX (ref: AMD64 Architecture Programmer's Manual Volume 3:
General-Purpose and System Instructions) and some bits are not
propagated to guests.
Enable propagation of these bits to guests, so that VMMs don't have to
enable them explicitly based on host CPUID.
Takahiro Itazuri (2):
x86/cpufeatures: Add AMD-specific IBRS bits
KVM: x86: Propagate AMD-specific IBRS related bits
arch/x86/include/asm/cpufeatures.h | 3 +++
arch/x86/kvm/cpuid.c | 5 +++--
2 files changed, 6 insertions(+), 2 deletions(-)
--
2.38.0
next reply other threads:[~2023-02-27 21:14 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-02-27 21:05 Takahiro Itazuri [this message]
2023-02-27 21:05 ` [PATCH 1/2] x86/cpufeatures: Add AMD-specific IBRS bits Takahiro Itazuri
2023-02-27 21:05 ` [PATCH 2/2] KVM: x86: Propagate AMD-specific IBRS related bits Takahiro Itazuri
2023-02-27 21:40 ` [PATCH 0/2] KVM: x86: Propagate AMD-specific IBRS bits to guests Borislav Petkov
2023-02-28 18:13 ` Takahiro Itazuri
2023-02-28 19:24 ` Borislav Petkov
2023-02-28 19:41 ` Takahiro Itazuri
2023-02-28 20:45 ` Borislav Petkov
2023-02-28 22:24 ` Takahiro Itazuri
2023-02-28 22:50 ` Borislav Petkov
2023-03-06 21:16 ` Sean Christopherson
2023-03-06 21:25 ` Paolo Bonzini
2023-03-06 21:44 ` Borislav Petkov
2023-03-06 21:47 ` Paolo Bonzini
2023-03-06 21:54 ` Borislav Petkov
2023-03-07 18:49 ` Sean Christopherson
2023-03-07 18:58 ` Borislav Petkov
2023-03-07 19:28 ` Sean Christopherson
2023-03-07 19:55 ` Borislav Petkov
2023-03-06 21:31 ` Paolo Bonzini
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