Re: [PATCH v6 6/6] KVM: PPC: Book3S HV: Use H_RPT_INVALIDATE in nested KVM

[David Gibson <david@gibson.dropbear.id.au>]

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On Thu, Mar 11, 2021 at 02:09:39PM +0530, Bharata B Rao wrote:
> In the nested KVM case, replace H_TLB_INVALIDATE by the new hcall
> H_RPT_INVALIDATE if available. The availability of this hcall
> is determined from "hcall-rpt-invalidate" string in ibm,hypertas-functions
> DT property.
> 
> Signed-off-by: Bharata B Rao <bharata@linux.ibm.com>
> Reviewed-by: Fabiano Rosas <farosas@linux.ibm.com>

Reviewed-by: David Gibson <david@gibson.dropbear.id.au>

> ---
>  arch/powerpc/kvm/book3s_64_mmu_radix.c | 27 +++++++++++++++++++++-----
>  arch/powerpc/kvm/book3s_hv_nested.c    | 12 ++++++++++--
>  2 files changed, 32 insertions(+), 7 deletions(-)
> 
> diff --git a/arch/powerpc/kvm/book3s_64_mmu_radix.c b/arch/powerpc/kvm/book3s_64_mmu_radix.c
> index e603de7ade52..1e1e55fd0ee5 100644
> --- a/arch/powerpc/kvm/book3s_64_mmu_radix.c
> +++ b/arch/powerpc/kvm/book3s_64_mmu_radix.c
> @@ -21,6 +21,7 @@
>  #include <asm/pte-walk.h>
>  #include <asm/ultravisor.h>
>  #include <asm/kvm_book3s_uvmem.h>
> +#include <asm/plpar_wrappers.h>
>  
>  /*
>   * Supported radix tree geometry.
> @@ -318,9 +319,19 @@ void kvmppc_radix_tlbie_page(struct kvm *kvm, unsigned long addr,
>  	}
>  
>  	psi = shift_to_mmu_psize(pshift);
> -	rb = addr | (mmu_get_ap(psi) << PPC_BITLSHIFT(58));
> -	rc = plpar_hcall_norets(H_TLB_INVALIDATE, H_TLBIE_P1_ENC(0, 0, 1),
> -				lpid, rb);
> +
> +	if (!firmware_has_feature(FW_FEATURE_RPT_INVALIDATE)) {
> +		rb = addr | (mmu_get_ap(psi) << PPC_BITLSHIFT(58));
> +		rc = plpar_hcall_norets(H_TLB_INVALIDATE, H_TLBIE_P1_ENC(0, 0, 1),
> +					lpid, rb);
> +	} else {
> +		rc = pseries_rpt_invalidate(lpid, H_RPTI_TARGET_CMMU,
> +					    H_RPTI_TYPE_NESTED |
> +					    H_RPTI_TYPE_TLB,
> +					    psize_to_rpti_pgsize(psi),
> +					    addr, addr + psize);
> +	}
> +
>  	if (rc)
>  		pr_err("KVM: TLB page invalidation hcall failed, rc=%ld\n", rc);
>  }
> @@ -334,8 +345,14 @@ static void kvmppc_radix_flush_pwc(struct kvm *kvm, unsigned int lpid)
>  		return;
>  	}
>  
> -	rc = plpar_hcall_norets(H_TLB_INVALIDATE, H_TLBIE_P1_ENC(1, 0, 1),
> -				lpid, TLBIEL_INVAL_SET_LPID);
> +	if (!firmware_has_feature(FW_FEATURE_RPT_INVALIDATE))
> +		rc = plpar_hcall_norets(H_TLB_INVALIDATE, H_TLBIE_P1_ENC(1, 0, 1),
> +					lpid, TLBIEL_INVAL_SET_LPID);
> +	else
> +		rc = pseries_rpt_invalidate(lpid, H_RPTI_TARGET_CMMU,
> +					    H_RPTI_TYPE_NESTED |
> +					    H_RPTI_TYPE_PWC, H_RPTI_PAGE_ALL,
> +					    0, -1UL);
>  	if (rc)
>  		pr_err("KVM: TLB PWC invalidation hcall failed, rc=%ld\n", rc);
>  }
> diff --git a/arch/powerpc/kvm/book3s_hv_nested.c b/arch/powerpc/kvm/book3s_hv_nested.c
> index adcc8e26ef22..5601b7eb9b89 100644
> --- a/arch/powerpc/kvm/book3s_hv_nested.c
> +++ b/arch/powerpc/kvm/book3s_hv_nested.c
> @@ -19,6 +19,7 @@
>  #include <asm/pgalloc.h>
>  #include <asm/pte-walk.h>
>  #include <asm/reg.h>
> +#include <asm/plpar_wrappers.h>
>  
>  static struct patb_entry *pseries_partition_tb;
>  
> @@ -444,8 +445,15 @@ static void kvmhv_flush_lpid(unsigned int lpid)
>  		return;
>  	}
>  
> -	rc = plpar_hcall_norets(H_TLB_INVALIDATE, H_TLBIE_P1_ENC(2, 0, 1),
> -				lpid, TLBIEL_INVAL_SET_LPID);
> +	if (!firmware_has_feature(FW_FEATURE_RPT_INVALIDATE))
> +		rc = plpar_hcall_norets(H_TLB_INVALIDATE, H_TLBIE_P1_ENC(2, 0, 1),
> +					lpid, TLBIEL_INVAL_SET_LPID);
> +	else
> +		rc = pseries_rpt_invalidate(lpid, H_RPTI_TARGET_CMMU,
> +					    H_RPTI_TYPE_NESTED |
> +					    H_RPTI_TYPE_TLB | H_RPTI_TYPE_PWC |
> +					    H_RPTI_TYPE_PAT,
> +					    H_RPTI_PAGE_ALL, 0, -1UL);
>  	if (rc)
>  		pr_err("KVM: TLB LPID invalidation hcall failed, rc=%ld\n", rc);
>  }

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson

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