From: Chao Gao <chao.gao@intel.com>
To: Robert Hoo <robert.hu@linux.intel.com>
Cc: <seanjc@google.com>, <pbonzini@redhat.com>,
<binbin.wu@linux.intel.com>, <kvm@vger.kernel.org>,
Jingqi Liu <jingqi.liu@intel.com>
Subject: Re: [PATCH v5 5/5] KVM: x86: LAM: Expose LAM CPUID to user space VMM
Date: Fri, 3 Mar 2023 14:46:38 +0800 [thread overview]
Message-ID: <ZAGXzoI8oZgw20Zv@gao-cwp> (raw)
In-Reply-To: <20230227084547.404871-6-robert.hu@linux.intel.com>
On Mon, Feb 27, 2023 at 04:45:47PM +0800, Robert Hoo wrote:
>LAM feature is enumerated by (EAX=07H, ECX=01H):EAX.LAM[bit26].
Please add some high-level introduction about LAM.
Maybe also call out that LAM's CR3 bits, CR4 bit and the modified
canonicality check are virtualized already. As the last step,
advertise LAM support to user space.
>
>Signed-off-by: Robert Hoo <robert.hu@linux.intel.com>
>Reviewed-by: Jingqi Liu <jingqi.liu@intel.com>
>---
> arch/x86/kvm/cpuid.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
>diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
>index b14653b61470..79f45cbe587e 100644
>--- a/arch/x86/kvm/cpuid.c
>+++ b/arch/x86/kvm/cpuid.c
>@@ -664,7 +664,7 @@ void kvm_set_cpu_caps(void)
>
> kvm_cpu_cap_mask(CPUID_7_1_EAX,
> F(AVX_VNNI) | F(AVX512_BF16) | F(CMPCCXADD) | F(AMX_FP16) |
>- F(AVX_IFMA)
>+ F(AVX_IFMA) | F(LAM)
> );
>
> kvm_cpu_cap_init_kvm_defined(CPUID_7_1_EDX,
>--
>2.31.1
>
prev parent reply other threads:[~2023-03-03 6:46 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-02-27 8:45 [PATCH v5 0/5] Linear Address Masking (LAM) KVM Enabling Robert Hoo
2023-02-27 8:45 ` [PATCH v5 1/5] KVM: x86: Virtualize CR4.LAM_SUP Robert Hoo
2023-03-02 7:17 ` Chao Gao
2023-03-02 12:03 ` Binbin Wu
2023-03-02 13:00 ` Robert Hoo
2023-02-27 8:45 ` [PATCH v5 2/5] [Trivial]KVM: x86: Explicitly cast ulong to bool in kvm_set_cr3() Robert Hoo
2023-03-02 7:24 ` Chao Gao
2023-03-03 3:23 ` Robert Hoo
2023-03-10 20:22 ` Sean Christopherson
2023-03-20 12:05 ` Binbin Wu
2023-03-20 13:56 ` Binbin Wu
2023-03-21 16:03 ` Sean Christopherson
2023-02-27 8:45 ` [PATCH v5 3/5] KVM: x86: Virtualize CR3.LAM_{U48,U57} Robert Hoo
2023-03-03 6:21 ` Chao Gao
2023-03-03 14:23 ` Robert Hoo
2023-03-03 15:53 ` Chao Gao
2023-03-05 1:31 ` Robert Hoo
2023-03-10 20:12 ` Sean Christopherson
2023-03-20 6:57 ` Binbin Wu
2023-02-27 8:45 ` [PATCH v5 4/5] KVM: x86: emulation: Apply LAM mask when emulating data access in 64-bit mode Robert Hoo
2023-03-02 6:41 ` Binbin Wu
2023-03-02 13:16 ` Robert Hoo
2023-03-03 1:08 ` Binbin Wu
2023-03-03 3:16 ` Robert Hoo
2023-03-03 3:35 ` Binbin Wu
2023-03-03 9:00 ` Robert Hoo
2023-03-03 10:18 ` Binbin Wu
2023-03-10 20:26 ` Sean Christopherson
2023-03-02 8:55 ` Chao Gao
2023-03-02 11:31 ` Binbin Wu
2023-03-10 20:23 ` Sean Christopherson
2023-02-27 8:45 ` [PATCH v5 5/5] KVM: x86: LAM: Expose LAM CPUID to user space VMM Robert Hoo
2023-03-03 6:46 ` Chao Gao [this message]
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