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Date: Sat, 8 Oct 2016 07:43:03 +0800
From: Wanpeng Li <kernellwp@...il.com>
To: Radim Krčmář <rkrcmar@...hat.com>
Cc: Paolo Bonzini <pbonzini@...hat.com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
kvm <kvm@...r.kernel.org>
Subject: Re: [PATCH v2 2/3] KVM: VMX: join functions that disable x2apic msr intercepts
2016-10-07 20:30 GMT+08:00 Radim Krčmář <rkrcmar@...hat.com>:
> 2016-09-30 10:29+0200, Paolo Bonzini:
>> On 29/09/2016 22:41, Radim Krčmář wrote:
>>> for (msr = 0x800; msr <= 0x8ff; msr++) {
>>> if (msr == 0x839 /* TMCCT */)
>>> continue;
>>> - vmx_disable_intercept_msr_read_x2apic(msr, true);
>>> + vmx_disable_intercept_msr_x2apic(msr, MSR_TYPE_R, true);
>>> }
>>>
>>> /* TPR */
>>> - vmx_disable_intercept_msr_write_x2apic(0x808, true);
>>> + vmx_disable_intercept_msr_x2apic(0x808, MSR_TYPE_W, true);
>>> /* EOI */
>>> - vmx_disable_intercept_msr_write_x2apic(0x80b, true);
>>> + vmx_disable_intercept_msr_x2apic(0x80b, MSR_TYPE_W, true);
>>> /* SELF-IPI */
>>> - vmx_disable_intercept_msr_write_x2apic(0x83f, true);
>>> + vmx_disable_intercept_msr_x2apic(0x83f, MSR_TYPE_W, true);
>>>
>>> /*
>>> * (enable_apicv && !kvm_vcpu_apicv_active()) ||
>>> * !enable_apicv
>>> */
>>> /* TPR */
>>> - vmx_disable_intercept_msr_read_x2apic(0x808, false);
>>> - vmx_disable_intercept_msr_write_x2apic(0x808, false);
>>> + vmx_disable_intercept_msr_x2apic(0x808, MSR_TYPE_R | MSR_TYPE_W, false);
>>
>> Alternatively you could place the two function calls for 0x808 together:
>>
>> for (msr = 0x800; msr <= 0x8ff; msr++)
>> vmx_disable_intercept_msr_x2apic(msr, MSR_TYPE_R, true);
>>
>> /*
>> * TPR reads and writes can be virtualized even if virtual interrupt delivery
>> * is not in use.
>> */
>> vmx_disable_intercept_msr_x2apic(0x808, MSR_TYPE_R | MSR_TYPE_W, false);
>> vmx_disable_intercept_msr_x2apic(0x808, MSR_TYPE_W, true);
>>
>> /* EOI */
>> vmx_disable_intercept_msr_x2apic(0x80b, MSR_TYPE_W, true);
>>
>> /* SELF-IPI */
>> vmx_disable_intercept_msr_x2apic(0x83f, MSR_TYPE_W, true);
>
> I have performed this change, thanks, and applied to kvm/queue;
> please check the complete patch below:
> ---8<---
> vmx_disable_intercept_msr_read_x2apic() and
> vmx_disable_intercept_msr_write_x2apic() differed only in the type.
> Pass the type to a new function.
>
> [Ordered and commented TPR intercept according to Paolo's suggestion.]
Looks good to me. :)
Regards,
Wanpeng Li
> Signed-off-by: Radim Krčmář <rkrcmar@...hat.com>
> ---
> arch/x86/kvm/vmx.c | 51 +++++++++++++++------------------------------------
> 1 file changed, 15 insertions(+), 36 deletions(-)
>
> diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
> index 8c83268f6f4c..69ff1be3db7b 100644
> --- a/arch/x86/kvm/vmx.c
> +++ b/arch/x86/kvm/vmx.c
> @@ -4656,33 +4656,18 @@ static void vmx_disable_intercept_for_msr(u32 msr, bool longmode_only)
> msr, MSR_TYPE_R | MSR_TYPE_W);
> }
>
> -static void vmx_disable_intercept_msr_read_x2apic(u32 msr, bool apicv_active)
> +static void vmx_disable_intercept_msr_x2apic(u32 msr, int type, bool apicv_active)
> {
> if (apicv_active) {
> __vmx_disable_intercept_for_msr(vmx_msr_bitmap_legacy_x2apic_apicv,
> - msr, MSR_TYPE_R);
> + msr, type);
> __vmx_disable_intercept_for_msr(vmx_msr_bitmap_longmode_x2apic_apicv,
> - msr, MSR_TYPE_R);
> + msr, type);
> } else {
> __vmx_disable_intercept_for_msr(vmx_msr_bitmap_legacy_x2apic,
> - msr, MSR_TYPE_R);
> + msr, type);
> __vmx_disable_intercept_for_msr(vmx_msr_bitmap_longmode_x2apic,
> - msr, MSR_TYPE_R);
> - }
> -}
> -
> -static void vmx_disable_intercept_msr_write_x2apic(u32 msr, bool apicv_active)
> -{
> - if (apicv_active) {
> - __vmx_disable_intercept_for_msr(vmx_msr_bitmap_legacy_x2apic_apicv,
> - msr, MSR_TYPE_W);
> - __vmx_disable_intercept_for_msr(vmx_msr_bitmap_longmode_x2apic_apicv,
> - msr, MSR_TYPE_W);
> - } else {
> - __vmx_disable_intercept_for_msr(vmx_msr_bitmap_legacy_x2apic,
> - msr, MSR_TYPE_W);
> - __vmx_disable_intercept_for_msr(vmx_msr_bitmap_longmode_x2apic,
> - msr, MSR_TYPE_W);
> + msr, type);
> }
> }
>
> @@ -6463,29 +6448,23 @@ static __init int hardware_setup(void)
>
> set_bit(0, vmx_vpid_bitmap); /* 0 is reserved for host */
>
> - /*
> - * enable_apicv && kvm_vcpu_apicv_active()
> - */
> for (msr = 0x800; msr <= 0x8ff; msr++) {
> if (msr == 0x839 /* TMCCT */)
> continue;
> - vmx_disable_intercept_msr_read_x2apic(msr, true);
> + vmx_disable_intercept_msr_x2apic(msr, MSR_TYPE_R, true);
> }
>
> - /* TPR */
> - vmx_disable_intercept_msr_write_x2apic(0x808, true);
> - /* EOI */
> - vmx_disable_intercept_msr_write_x2apic(0x80b, true);
> - /* SELF-IPI */
> - vmx_disable_intercept_msr_write_x2apic(0x83f, true);
> -
> /*
> - * (enable_apicv && !kvm_vcpu_apicv_active()) ||
> - * !enable_apicv
> + * TPR reads and writes can be virtualized even if virtual interrupt
> + * delivery is not in use.
> */
> - /* TPR */
> - vmx_disable_intercept_msr_read_x2apic(0x808, false);
> - vmx_disable_intercept_msr_write_x2apic(0x808, false);
> + vmx_disable_intercept_msr_x2apic(0x808, MSR_TYPE_W, true);
> + vmx_disable_intercept_msr_x2apic(0x808, MSR_TYPE_R | MSR_TYPE_W, false);
> +
> + /* EOI */
> + vmx_disable_intercept_msr_x2apic(0x80b, MSR_TYPE_W, true);
> + /* SELF-IPI */
> + vmx_disable_intercept_msr_x2apic(0x83f, MSR_TYPE_W, true);
>
> if (enable_ept) {
> kvm_mmu_set_mask_ptes(VMX_EPT_READABLE_MASK,
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