From: Nikolay Borisov <nik.borisov@suse.com>
To: Alexandre Chartre <alexandre.chartre@oracle.com>,
x86@kernel.org, kvm@vger.kernel.org
Cc: linux-kernel@vger.kernel.org, daniel.sneddon@linux.intel.com,
pawan.kumar.gupta@linux.intel.com, tglx@linutronix.de,
konrad.wilk@oracle.com, peterz@infradead.org,
gregkh@linuxfoundation.org, seanjc@google.com,
andrew.cooper3@citrix.com, dave.hansen@linux.intel.com,
kpsingh@kernel.org, longman@redhat.com, bp@alien8.de,
pbonzini@redhat.com
Subject: Re: [PATCH] KVM: x86: Set BHI_NO in guest when host is not affected by BHI
Date: Thu, 11 Apr 2024 10:51:58 +0300 [thread overview]
Message-ID: <8263d92e-4496-4085-aef5-41c94dc39c52@suse.com> (raw)
In-Reply-To: <20240411072445.522731-1-alexandre.chartre@oracle.com>
On 11.04.24 г. 10:24 ч., Alexandre Chartre wrote:
> When a system is not affected by the BHI bug then KVM should
> configure guests with BHI_NO to ensure they won't enable any
> BHI mitigation.
>
> Signed-off-by: Alexandre Chartre <alexandre.chartre@oracle.com>
> ---
> arch/x86/kvm/x86.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index 984ea2089efc..f43d3c15a6b7 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -1678,6 +1678,9 @@ static u64 kvm_get_arch_capabilities(void)
> if (!boot_cpu_has_bug(X86_BUG_GDS) || gds_ucode_mitigated())
> data |= ARCH_CAP_GDS_NO;
>
> + if (!boot_cpu_has_bug(X86_BUG_BHI))
> + data |= ARCH_CAP_BHI_NO;
> +
> return data;
> }
>
Reviewed-by: Nikolay Borisov <nik.borisov@suse.com>
next prev parent reply other threads:[~2024-04-11 7:52 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-11 7:24 [PATCH] KVM: x86: Set BHI_NO in guest when host is not affected by BHI Alexandre Chartre
2024-04-11 7:34 ` Nikolay Borisov
2024-04-11 7:49 ` Alexandre Chartre
2024-04-11 7:51 ` Greg KH
2024-04-11 8:00 ` Alexandre Chartre
2024-04-11 7:51 ` Nikolay Borisov [this message]
2024-04-11 8:43 ` Andrew Cooper
2024-04-11 9:33 ` Alexandre Chartre
2024-04-11 9:38 ` Andrew Cooper
2024-04-11 11:14 ` Chao Gao
2024-04-11 13:20 ` Alexandre Chartre
2024-04-15 15:14 ` Alexandre Chartre
2024-04-15 17:17 ` Dave Hansen
2024-04-16 8:41 ` Alexandre Chartre
2024-04-25 20:45 ` Konrad Rzeszutek Wilk
2024-04-11 13:22 ` Paolo Bonzini
2024-04-11 13:32 ` Alexandre Chartre
2024-04-11 14:13 ` Andrew Cooper
2024-04-11 14:33 ` Alexandre Chartre
2024-04-11 14:46 ` Paolo Bonzini
2024-04-11 15:12 ` Alexandre Chartre
2024-04-11 15:20 ` Paolo Bonzini
2024-04-11 15:56 ` Chao Gao
2024-04-11 20:50 ` Konrad Rzeszutek Wilk
2024-04-12 3:24 ` Chao Gao
2024-04-12 16:33 ` Konrad Rzeszutek Wilk
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