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Re: [Xen-devel] [PATCH v2] always clear the X2APIC_ENABLE bit for PV guest
- To: Xin Li <talons.lee@xxxxxxxxx>, xen-devel@xxxxxxxxxxxxx
- From: Juergen Gross <jgross@xxxxxxxx>
- Date: Tue, 4 Dec 2018 11:29:30 +0100
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- Cc: Talons Lee <xin.li@xxxxxxxxxx>, Sergey Dyasli <sergey.dyasli@xxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Igor Druzhinin <igor.druzhinin@xxxxxxxxxx>
- Delivery-date: Tue, 04 Dec 2018 10:29:37 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 04/12/2018 11:25, Xin Li wrote:
> From: Talons Lee <xin.li@xxxxxxxxxx>
>
> Commit e657fcc clears cpu capability bit instead of using fake cpuid
> value, the EXID should always be off for PV guest without depending
> on cpuid value. So remove the cpuid check in xen_read_msr_safe() to
> always clear the X2APIC_ENABLE bit.
>
> Signed-off-by: Talons Lee <xin.li@xxxxxxxxxx>
>
> ---
> CC: Igor Druzhinin <igor.druzhinin@xxxxxxxxxx>
> CC: Sergey Dyasli <sergey.dyasli@xxxxxxxxxx>
> CC: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
> CC: Juergen Gross <jgross@xxxxxxxx>
>
> v2:
> don't use fake cpuid to cheat xen_read_msr_safe(), just always clear
> the EXIT bit.
> ---
> arch/x86/xen/enlighten_pv.c | 3 ---
> 1 file changed, 3 deletions(-)
>
> diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c
> index 4b20082..6ad312d 100644
> --- a/arch/x86/xen/enlighten_pv.c
> +++ b/arch/x86/xen/enlighten_pv.c
> @@ -900,9 +900,6 @@ static u64 xen_read_msr_safe(unsigned int msr, int *err)
> val = native_read_msr_safe(msr, err);
> switch (msr) {
> case MSR_IA32_APICBASE:
> -#ifdef CONFIG_X86_X2APIC
> - if (!(cpuid_ecx(1) & (1 << (X86_FEATURE_X2APIC & 31))))
> -#endif
> val &= ~X2APIC_ENABLE;
Could you please correct indentation?
With that addressed you can have my
Reviewed-by: Juergen Gross <jgross@xxxxxxxx>
Juergen
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