Zhang, Xiantao wrote:
> According to privious decisions, mmu code should be moved to arch.
>
> >From 43a629932b6babcbf2af75299192c1d77c2393d5 Mon Sep 17 00:00:00 2001
> From: Zhang Xiantao <[EMAIL PROTECTED]>
> Date: Fri, 16 Nov 2007 13:16:40 +0800
> Subject: [PATCH] KVM: MMU split for portability.
> Since mmu code is very arch-denpendent, move them to archs.
> 1. For kvm_vm_ioctl_get_dirty_log, this ioctl should be first transfered
> to arch-specific code, and will
> call the common code implemtend in kvm_get_dirty_log to perform common
> task.
> 2. For set_memory_region, I moved the mmu-speicific operations to an
> arch-ops.
> Signed-off-by: Zhang Xiantao <[EMAIL PROTECTED]>
> ---
> drivers/kvm/kvm.h | 8 ++++
> drivers/kvm/kvm_main.c | 49 +++------------------------
> drivers/kvm/x86.c | 85
> +++++++++++++++++++++++++++++++++++++++++++++---
> 3 files changed, 94 insertions(+), 48 deletions(-)
>
> diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c
> index 0414e92..84eec47 100644
> --- a/drivers/kvm/kvm_main.c
> +++ b/drivers/kvm/kvm_main.c
> @@ -362,29 +362,9 @@ int __kvm_set_memory_region(struct kvm *kvm,
> if (mem->slot >= kvm->nmemslots)
> kvm->nmemslots = mem->slot + 1;
>
> - if (!kvm->n_requested_mmu_pages) {
> - unsigned int n_pages;
> -
> - if (npages) {
> - n_pages = npages * KVM_PERMILLE_MMU_PAGES /
> 1000;
> - kvm_mmu_change_mmu_pages(kvm,
> kvm->n_alloc_mmu_pages +
> - n_pages);
> - } else {
> - unsigned int nr_mmu_pages;
> -
> - n_pages = old.npages * KVM_PERMILLE_MMU_PAGES /
>
We rely on the values in 'old' here...
> 1000;
> - nr_mmu_pages = kvm->n_alloc_mmu_pages - n_pages;
> - nr_mmu_pages = max(nr_mmu_pages,
> - (unsigned int)
> KVM_MIN_ALLOC_MMU_PAGES);
> - kvm_mmu_change_mmu_pages(kvm, nr_mmu_pages);
> - }
> - }
>
> *memslot = new;
>
> - kvm_mmu_slot_remove_write_access(kvm, mem->slot);
> - kvm_flush_remote_tlbs(kvm);
> -
> kvm_free_physmem_slot(&old, &new);
> return 0;
>
> @@ -404,6 +384,8 @@ int kvm_set_memory_region(struct kvm *kvm,
>
> mutex_lock(&kvm->lock);
> r = __kvm_set_memory_region(kvm, mem, user_alloc);
> + if (r == 0)
> + kvm_arch_set_memory_region(kvm, mem, user_alloc);
>
But 'old' does not longer exist here. You recalculate it from
kvm->memslots[] but the value is not longer identical to the 'old' value.
Suggest changing this code not to rely on 'old' at all; instead
recalculate nr_mmu_pages from kvm->memslots[] each time. That will make
the code more robust, enabling the movement later.
--
error compiling committee.c: too many arguments to function
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