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Re: [PATCH V3 07/14] KVM: MIPS: Use root tlb to control guest's CCA for
From: |
Aleksandar Markovic |
Subject: |
Re: [PATCH V3 07/14] KVM: MIPS: Use root tlb to control guest's CCA for Loongson-3 |
Date: |
Fri, 8 May 2020 12:53:35 +0200 |
нед, 3. мај 2020. у 12:12 Huacai Chen <address@hidden> је написао/ла:
>
> KVM guest has two levels of address translation: guest tlb translates
> GVA to GPA, and root tlb translates GPA to HPA. By default guest's CCA
> is controlled by guest tlb, but Loongson-3 maintains all cache coherency
> by hardware (including multi-core coherency and I/O DMA coherency) so it
> prefers all guest mappings be cacheable mappings. Thus, we use root tlb
> to control guest's CCA for Loongson-3.
>
> Signed-off-by: Huacai Chen <address@hidden>
> Co-developed-by: Jiaxun Yang <address@hidden>
> ---
> arch/mips/kvm/vz.c | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/arch/mips/kvm/vz.c b/arch/mips/kvm/vz.c
> index 422cd06..f9fbbc16 100644
> --- a/arch/mips/kvm/vz.c
> +++ b/arch/mips/kvm/vz.c
> @@ -2871,6 +2871,12 @@ static int kvm_vz_hardware_enable(void)
> if (cpu_has_guestctl2)
> clear_c0_guestctl2(0x3f << 10);
>
> +#ifdef CONFIG_CPU_LOONGSON64
> + /* Control guest CCA attribute */
> + if (cpu_has_csr())
> + csr_writel(csr_readl(0xffffffec) | 0x1, 0xffffffec);
> +#endif
> +
> return 0;
> }
>
> --
> 2.7.0
>
Reviewed-by: Aleksandar Markovic <address@hidden>
- [PATCH V3 03/14] KVM: MIPS: Increase KVM_MAX_VCPUS and KVM_USER_MEM_SLOTS to 16, (continued)
- [PATCH V3 03/14] KVM: MIPS: Increase KVM_MAX_VCPUS and KVM_USER_MEM_SLOTS to 16, Huacai Chen, 2020/05/03
- [PATCH V3 04/14] KVM: MIPS: Add EVENTFD support which is needed by VHOST, Huacai Chen, 2020/05/03
- [PATCH V3 05/14] KVM: MIPS: Use lddir/ldpte instructions to lookup gpa_mm.pgd, Huacai Chen, 2020/05/03
- [PATCH V3 06/14] KVM: MIPS: Introduce and use cpu_guest_has_ldpte, Huacai Chen, 2020/05/03
- [PATCH V3 07/14] KVM: MIPS: Use root tlb to control guest's CCA for Loongson-3, Huacai Chen, 2020/05/03
- Re: [PATCH V3 07/14] KVM: MIPS: Use root tlb to control guest's CCA for Loongson-3,
Aleksandar Markovic <=
- [PATCH V3 08/14] KVM: MIPS: Let indexed cacheops cause guest exit on Loongson-3, Huacai Chen, 2020/05/03
- [PATCH V3 09/14] KVM: MIPS: Add more types of virtual interrupts, Huacai Chen, 2020/05/03
- [PATCH V3 10/14] KVM: MIPS: Add Loongson-3 Virtual IPI interrupt support, Huacai Chen, 2020/05/03
- [PATCH V3 11/14] KVM: MIPS: Add CPUCFG emulation for Loongson-3, Huacai Chen, 2020/05/03
- [PATCH V3 12/14] KVM: MIPS: Add CONFIG6 and DIAG registers emulation, Huacai Chen, 2020/05/03
- [PATCH V3 13/14] KVM: MIPS: Add more MMIO load/store instructions emulation, Huacai Chen, 2020/05/03