From: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>
To: Marcelo Tosatti <mtosatti@redhat.com>
Cc: linux-arch@vger.kernel.org, arnd@arndb.de, kvm@vger.kernel.org,
kvm-ia64@vger.kernel.org, fernando@oss.ntt.co.jp, x86@kernel.org,
agraf@suse.de, kvm-ppc@vger.kernel.org,
linux-kernel@vger.kernel.org, linuxppc-dev@ozlabs.org,
mingo@redhat.com, paulus@samba.org, avi@redhat.com,
hpa@zytor.com, tglx@linutronix.de,
Takuya Yoshikawa <takuya.yoshikawa@gmail.com>
Subject: Re: [RFC][PATCH RFC 10/12] KVM: move dirty bitmaps to user space
Date: Wed, 12 May 2010 15:27:46 +0900 [thread overview]
Message-ID: <4BEA4A62.20100@oss.ntt.co.jp> (raw)
In-Reply-To: <20100511032827.GA3458@amt.cnet>
>> r = 0;
>> @@ -1195,11 +1232,16 @@ void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
>> gfn = unalias_gfn(kvm, gfn);
>> memslot = gfn_to_memslot_unaliased(kvm, gfn);
>> if (memslot&& memslot->dirty_bitmap) {
>> - unsigned long rel_gfn = gfn - memslot->base_gfn;
>> + int nr = generic_le_bit_offset(gfn - memslot->base_gfn);
>>
>> - generic___set_le_bit(rel_gfn, memslot->dirty_bitmap);
>> + if (kvm_set_bit_user(nr, memslot->dirty_bitmap))
>> + goto out_fault;
>
> mark_page_dirty is called with the mmu_lock spinlock held in set_spte.
> Must find a way to move it outside of the spinlock section.
>
Oh, it's a serious problem. I have to consider it.
Thanks,
Takuya
next prev parent reply other threads:[~2010-05-12 6:24 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-04 12:56 [RFC][PATCH 0/12] KVM, x86, ppc, asm-generic: moving dirty bitmaps to user space Takuya Yoshikawa
2010-05-04 12:58 ` [RFC][PATCH 1/12 applied today] KVM: x86: avoid unnecessary bitmap allocation when memslot is clean Takuya Yoshikawa
2010-05-04 13:00 ` [RFC][PATCH 2/12] KVM: introduce slot level dirty state management Takuya Yoshikawa
2010-05-04 13:01 ` [RFC][PATCH 3/12] KVM: introduce wrapper functions to create and destroy dirty bitmaps Takuya Yoshikawa
2010-05-04 13:02 ` [RFC][PATCH 4/12] x86: introduce copy_in_user() for 32-bit Takuya Yoshikawa
2010-05-04 13:02 ` [RFC][PATCH 5/12] x86: introduce __set_bit() like function for bitmaps in user space Takuya Yoshikawa
2010-05-04 13:03 ` [RFC][PATCH 6/12 not tested yet] PPC: introduce copy_in_user() for 32-bit Takuya Yoshikawa
2010-05-04 13:04 ` [RFC][PATCH 7/12 not tested yet] PPC: introduce __set_bit() like function for bitmaps in user space Takuya Yoshikawa
2010-05-11 16:00 ` Alexander Graf
2010-05-12 9:25 ` Takuya Yoshikawa
2010-05-04 13:05 ` [RFC][PATCH resend 8/12] asm-generic: bitops: introduce le bit offset macro Takuya Yoshikawa
2010-05-04 15:03 ` Arnd Bergmann
2010-05-04 16:08 ` Avi Kivity
2010-05-05 2:59 ` Takuya Yoshikawa
2010-05-06 13:38 ` Arnd Bergmann
2010-05-10 11:46 ` Takuya Yoshikawa
2010-05-10 12:01 ` Avi Kivity
2010-05-10 12:01 ` Arnd Bergmann
2010-05-10 12:09 ` Takuya Yoshikawa
2010-05-04 13:06 ` [RFC][PATCH 9/12] KVM: introduce a wrapper function of set_bit_user_non_atomic() Takuya Yoshikawa
2010-05-04 13:07 ` [RFC][PATCH RFC 10/12] KVM: move dirty bitmaps to user space Takuya Yoshikawa
2010-05-11 3:28 ` Marcelo Tosatti
2010-05-12 6:27 ` Takuya Yoshikawa [this message]
2010-05-04 13:08 ` [RFC][PATCH 11/12] KVM: introduce new API for getting/switching dirty bitmaps Takuya Yoshikawa
2010-05-11 3:43 ` Marcelo Tosatti
2010-05-11 5:53 ` Takuya Yoshikawa
2010-05-11 14:07 ` Marcelo Tosatti
2010-05-12 6:03 ` Takuya Yoshikawa
2010-05-04 13:11 ` [RFC][PATCH 12/12 sample] qemu-kvm: use " Takuya Yoshikawa
2010-05-10 12:06 ` [RFC][PATCH 0/12] KVM, x86, ppc, asm-generic: moving dirty bitmaps to user space Avi Kivity
2010-05-10 12:26 ` Takuya Yoshikawa
2010-05-11 10:11 ` Takuya Yoshikawa
2010-05-13 11:47 ` Avi Kivity
2010-05-17 9:06 ` Takuya Yoshikawa
2010-05-11 15:55 ` Alexander Graf
2010-05-12 9:19 ` Takuya Yoshikawa
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