From: Sean Christopherson <seanjc@google.com>
To: Peter Xu <peterx@redhat.com>
Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
Paolo Bonzini <pbonzini@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
David Hildenbrand <david@redhat.com>,
"Dr . David Alan Gilbert" <dgilbert@redhat.com>,
Andrea Arcangeli <aarcange@redhat.com>,
Linux MM Mailing List <linux-mm@kvack.org>
Subject: Re: [PATCH 2/4] kvm: Merge "atomic" and "write" in __gfn_to_pfn_memslot()
Date: Thu, 23 Jun 2022 14:49:47 +0000 [thread overview]
Message-ID: <YrR9i3yHzh5ftOxB@google.com> (raw)
In-Reply-To: <20220622213656.81546-3-peterx@redhat.com>
On Wed, Jun 22, 2022, Peter Xu wrote:
> Merge two boolean parameters into a bitmask flag called kvm_gtp_flag_t for
> __gfn_to_pfn_memslot(). This cleans the parameter lists, and also prepare
> for new boolean to be added to __gfn_to_pfn_memslot().
...
> @@ -3999,8 +4000,8 @@ static int kvm_faultin_pfn(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault)
> }
>
> async = false;
> - fault->pfn = __gfn_to_pfn_memslot(slot, fault->gfn, false, &async,
> - fault->write, &fault->map_writable,
> + fault->pfn = __gfn_to_pfn_memslot(slot, fault->gfn, flags,
> + &async, &fault->map_writable,
> &fault->hva);
> if (!async)
> return RET_PF_CONTINUE; /* *pfn has correct page already */
> @@ -4016,9 +4017,8 @@ static int kvm_faultin_pfn(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault)
> }
> }
>
> - fault->pfn = __gfn_to_pfn_memslot(slot, fault->gfn, false, NULL,
> - fault->write, &fault->map_writable,
> - &fault->hva);
> + fault->pfn = __gfn_to_pfn_memslot(slot, fault->gfn, flags, NULL,
> + &fault->map_writable, &fault->hva);
> return RET_PF_CONTINUE;
> }
>
> diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
> index c20f2d55840c..b646b6fcaec6 100644
> --- a/include/linux/kvm_host.h
> +++ b/include/linux/kvm_host.h
> @@ -1146,8 +1146,15 @@ kvm_pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault,
> bool *writable);
> kvm_pfn_t gfn_to_pfn_memslot(const struct kvm_memory_slot *slot, gfn_t gfn);
> kvm_pfn_t gfn_to_pfn_memslot_atomic(const struct kvm_memory_slot *slot, gfn_t gfn);
> +
> +/* gfn_to_pfn (gtp) flags */
> +typedef unsigned int __bitwise kvm_gtp_flag_t;
> +
> +#define KVM_GTP_WRITE ((__force kvm_gtp_flag_t) BIT(0))
> +#define KVM_GTP_ATOMIC ((__force kvm_gtp_flag_t) BIT(1))
> +
> kvm_pfn_t __gfn_to_pfn_memslot(const struct kvm_memory_slot *slot, gfn_t gfn,
> - bool atomic, bool *async, bool write_fault,
> + kvm_gtp_flag_t gtp_flags, bool *async,
> bool *writable, hva_t *hva);
I completely agree the list of booleans is a mess, but I don't love the result of
adding @flags. I wonder if we can do something similar to x86's struct kvm_page_fault
and add an internal struct to pass params. And then add e.g. gfn_to_pfn_interruptible()
to wrap that logic.
I suspect we could also clean up the @async behavior at the same time, as its
interaction with FOLL_NOWAIT is confusing.
next prev parent reply other threads:[~2022-06-23 14:49 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-22 21:36 [PATCH 0/4] kvm/mm: Allow GUP to respond to non fatal signals Peter Xu
2022-06-22 21:36 ` [PATCH 1/4] mm/gup: Add FOLL_INTERRUPTIBLE Peter Xu
2022-06-25 0:35 ` Jason Gunthorpe
2022-06-25 1:23 ` Peter Xu
2022-06-25 23:59 ` Jason Gunthorpe
2022-06-27 15:29 ` Peter Xu
2022-06-28 2:07 ` John Hubbard
2022-06-28 19:31 ` Peter Xu
2022-06-28 21:40 ` John Hubbard
2022-06-28 22:33 ` Peter Xu
2022-06-29 0:31 ` John Hubbard
2022-06-29 15:47 ` Peter Xu
2022-06-30 1:53 ` John Hubbard
2022-06-30 13:49 ` Peter Xu
2022-06-30 19:01 ` John Hubbard
2022-06-30 21:27 ` Peter Xu
2022-07-04 22:48 ` Matthew Wilcox
2022-07-07 15:06 ` Peter Xu
2022-06-22 21:36 ` [PATCH 2/4] kvm: Merge "atomic" and "write" in __gfn_to_pfn_memslot() Peter Xu
2022-06-23 14:49 ` Sean Christopherson [this message]
2022-06-23 19:46 ` Peter Xu
2022-06-23 20:29 ` Sean Christopherson
2022-06-23 21:29 ` Peter Xu
2022-06-23 21:52 ` Sean Christopherson
2022-06-27 19:12 ` John Hubbard
2022-06-28 2:17 ` John Hubbard
2022-06-28 19:46 ` Peter Xu
2022-06-28 21:52 ` John Hubbard
2022-06-28 22:50 ` Peter Xu
2022-06-28 22:55 ` John Hubbard
2022-06-28 23:02 ` Peter Xu
2022-06-22 21:36 ` [PATCH 3/4] kvm: Add new pfn error KVM_PFN_ERR_INTR Peter Xu
2022-06-23 14:31 ` Sean Christopherson
2022-06-23 19:32 ` Peter Xu
2022-06-22 21:36 ` [PATCH 4/4] kvm/x86: Allow to respond to generic signals during slow page faults Peter Xu
2022-06-23 14:46 ` Sean Christopherson
2022-06-23 19:31 ` Peter Xu
2022-06-23 20:07 ` Sean Christopherson
2022-06-23 20:18 ` Peter Xu
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