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[Qemu-devel] Re: [PATCH] remove smaller slots if registering a bigger on
From: |
Jan Kiszka |
Subject: |
[Qemu-devel] Re: [PATCH] remove smaller slots if registering a bigger one |
Date: |
Wed, 11 Feb 2009 15:23:07 +0100 |
User-agent: |
Mozilla/5.0 (X11; U; Linux i686 (x86_64); de; rv:1.8.1.12) Gecko/20080226 SUSE/2.0.0.12-1.1 Thunderbird/2.0.0.12 Mnenhy/0.7.5.666 |
Glauber Costa wrote:
> It's like a shark eating a bunch of small fishes:
> in some situations (vga linear frame buffer mapping,
> for example), we need to register a new slot in place
> of older, smaller ones. This patch handles this case
>
> Signed-off-by: Glauber Costa <address@hidden>
> ---
> kvm-all.c | 10 ++++++++++
> 1 files changed, 10 insertions(+), 0 deletions(-)
>
> diff --git a/kvm-all.c b/kvm-all.c
> index 9fb295c..53aca0a 100644
> --- a/kvm-all.c
> +++ b/kvm-all.c
> @@ -582,6 +582,16 @@ void kvm_set_phys_mem(target_phys_addr_t start_addr,
> kvm_set_phys_mem(mem_start, mem_size, mem_offset);
>
> return;
> + } else if (start_addr <= mem->start_addr &&
> + (start_addr + size) >= (mem->start_addr +
> + mem->memory_size)) {
> + KVMSlot slot;
> + /* unregister whole slot */
> + memcpy(&slot, mem, sizeof(slot));
> + mem->memory_size = 0;
> + kvm_set_user_memory_region(s, mem);
> +
> + kvm_set_phys_mem(start_addr, size, phys_offset);
That may solve some problems, but...
> } else {
> printf("Registering overlapping slot\n");
> abort();
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
...as long as this line exists, issues will remain. IIRC, the mapping
the i440 tries to re-establish after reboot will hit this case.
BTW, I found the unposted patch below in my attic, maybe you can comment
on it (if it makes sense, I'll properly repost with signed-off).
Thanks,
Jan
---------->
kvm: cleanup unmap condition in kvm_set_phys_mem
Testing for TLB_MMIO on unmap makes no sense as A) that flag belongs to
CPUTLBEntry and not to io_memory slots or physical addresses and B) we
already use a different condition before mapping. So make this test
consistent.
diff --git a/kvm-all.c b/kvm-all.c
index 9fb295c..c0481a0 100644
--- a/kvm-all.c
+++ b/kvm-all.c
@@ -540,7 +540,7 @@ void kvm_set_phys_mem(target_phys_addr_t start_addr,
mem = kvm_lookup_slot(s, start_addr);
if (mem) {
- if ((flags == IO_MEM_UNASSIGNED) || (flags >= TLB_MMIO)) {
+ if (flags >= IO_MEM_UNASSIGNED) {
mem->memory_size = 0;
mem->start_addr = start_addr;
mem->phys_offset = 0;
- [Qemu-devel] [PATCH] remove smaller slots if registering a bigger one, Glauber Costa, 2009/02/11
- [Qemu-devel] Re: [PATCH] remove smaller slots if registering a bigger one,
Jan Kiszka <=
- [Qemu-devel] Re: [PATCH] remove smaller slots if registering a bigger one, Glauber Costa, 2009/02/11
- [Qemu-devel] Re: [PATCH] remove smaller slots if registering a bigger one, Jan Kiszka, 2009/02/11
- [Qemu-devel] Re: [PATCH] remove smaller slots if registering a bigger one, Jan Kiszka, 2009/02/11
- [Qemu-devel] Re: [PATCH] remove smaller slots if registering a bigger one, Glauber Costa, 2009/02/11
- Re: [Qemu-devel] Re: [PATCH] remove smaller slots if registering a bigger one, Avi Kivity, 2009/02/11
- [Qemu-devel] Re: [PATCH] remove smaller slots if registering a bigger one, Jan Kiszka, 2009/02/11
- Re: [Qemu-devel] Re: [PATCH] remove smaller slots if registering a bigger one, Avi Kivity, 2009/02/11
Re: [Qemu-devel] Re: [PATCH] remove smaller slots if registering a bigger one, Avi Kivity, 2009/02/11