From: Sean Christopherson <seanjc@google.com>
To: Zeng Guang <guang.zeng@intel.com>
Cc: 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>,
H Peter Anvin <hpa@zytor.com>,
kvm@vger.kernel.org, x86@kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v1 2/6] KVM: x86: Virtualize CR4.LASS
Date: Tue, 27 Jun 2023 10:43:14 -0700 [thread overview]
Message-ID: <ZJsfsjwug9PcQFLA@google.com> (raw)
In-Reply-To: <20230601142309.6307-3-guang.zeng@intel.com>
On Thu, Jun 01, 2023, Zeng Guang wrote:
> Virtualize CR4.LASS[bit 27] under KVM control instead of being guest-owned
> as CR4.LASS generally set once for each vCPU at boot time and won't be
> toggled at runtime. Besides, only if VM has LASS capability enumerated with
> CPUID.(EAX=07H.ECX=1):EAX.LASS[bit 6], KVM allows guest software to be able
> to set CR4.LASS.
>
> Updating cr4_fixed1 to set CR4.LASS bit in the emulated IA32_VMX_CR4_FIXED1
> MSR for guests and allow guests to enable LASS in nested VMX operaion as well.
s/operaion/operation.
next prev parent reply other threads:[~2023-06-27 17:43 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-06-01 14:23 [PATCH v1 0/6] LASS KVM virtualization support Zeng Guang
2023-06-01 14:23 ` [PATCH v1 1/6] KVM: x86: Consolidate flags for __linearize() Zeng Guang
2023-06-27 17:40 ` Sean Christopherson
2023-06-28 5:13 ` Binbin Wu
2023-06-28 7:27 ` Zeng Guang
2023-06-01 14:23 ` [PATCH v1 2/6] KVM: x86: Virtualize CR4.LASS Zeng Guang
2023-06-05 1:57 ` Binbin Wu
2023-06-06 2:57 ` Zeng Guang
2023-06-27 17:43 ` Sean Christopherson [this message]
2023-06-28 8:19 ` Zeng Guang
2023-08-16 22:16 ` Sean Christopherson
2023-06-01 14:23 ` [PATCH v1 3/6] KVM: VMX: Add new ops in kvm_x86_ops for LASS violation check Zeng Guang
2023-06-05 3:31 ` Binbin Wu
2023-06-05 12:53 ` Zhi Wang
2023-06-06 2:57 ` Binbin Wu
2023-06-06 3:53 ` Zhi Wang
2023-06-07 6:28 ` Zeng Guang
2023-06-05 3:47 ` Chao Gao
2023-06-06 6:22 ` Zeng Guang
2023-06-05 14:07 ` Yuan Yao
2023-06-06 3:08 ` Zeng Guang
2023-06-27 18:26 ` Sean Christopherson
2023-06-27 22:45 ` Sean Christopherson
2023-06-30 18:50 ` Zeng Guang
2023-06-01 14:23 ` [PATCH v1 4/6] KVM: x86: Add emulator helper " Zeng Guang
2023-06-27 18:28 ` Sean Christopherson
2023-06-29 15:06 ` Zeng Guang
2023-06-01 14:23 ` [PATCH v1 5/6] KVM: x86: LASS protection on KVM emulation Zeng Guang
2023-06-06 4:20 ` Binbin Wu
2023-06-01 14:23 ` [PATCH v1 6/6] KVM: x86: Advertise LASS CPUID to user space Zeng Guang
2023-06-02 0:35 ` [PATCH v1 0/6] LASS KVM virtualization support Sean Christopherson
2023-06-06 2:22 ` Zeng Guang
2023-06-05 1:39 ` Binbin Wu
2023-06-06 2:40 ` Zeng Guang
2023-06-27 17:08 ` Sean Christopherson
2023-06-28 8:42 ` Zeng Guang
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