From: Joerg Roedel <joro@8bytes.org>
To: prasadjoshi.linux@gmail.com
Cc: kvm@vger.kernel.org, mtosatti@redhat.com, gleb@redhat.com
Subject: Re: [PATCH] kvm:x86/svm: enable SVM lock if host supports it
Date: Wed, 17 Apr 2013 21:48:21 +0200 [thread overview]
Message-ID: <20130417194821.GU6858@8bytes.org> (raw)
In-Reply-To: <1366220013-2107-1-git-send-email-prasadjoshi.linux@gmail.com>
On Wed, Apr 17, 2013 at 11:03:33PM +0530, prasadjoshi.linux@gmail.com wrote:
> From: Prasad Joshi <prasadjoshi.linux@gmail.com>
>
> SVM lock features allows software from preventing update to EFER.SVME.
> Enable the SVM lock in guest if it is supported on host machine.
>
> Signed-off-by: Prasad Joshi <prasadjoshi.linux@gmail.com>
> ---
> arch/x86/kvm/svm.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
> index e1b1ce2..fcdfdea 100644
> --- a/arch/x86/kvm/svm.c
> +++ b/arch/x86/kvm/svm.c
> @@ -4031,6 +4031,10 @@ static void svm_set_supported_cpuid(u32 func, struct kvm_cpuid_entry2 *entry)
> if (boot_cpu_has(X86_FEATURE_NRIPS))
> entry->edx |= SVM_FEATURE_NRIP;
>
> + /* support SVM Lock if host supports it */
> + if (boot_cpu_has(X86_FEATURE_SVML))
> + entry->edx |= SVM_FEATURE_SVML;
> +
No. SVM lock is way more complex to emulate than just setting the CPUID
bit.
Joerg
next prev parent reply other threads:[~2013-04-17 19:48 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-17 17:33 [PATCH] kvm:x86/svm: enable SVM lock if host supports it prasadjoshi.linux
2013-04-17 19:48 ` Joerg Roedel [this message]
2013-04-21 8:49 ` Prasad Joshi
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