- 17 May, 2010 40 commits
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Alexander Graf authored
Book3S_32 doesn't know about segment faults. It only knows about page faults. So in order to know that we didn't map a segment, we need to fake segment faults. We do this by setting invalid segment registers to an invalid VSID and then check for that VSID on normal page faults. Signed-off-by:
Alexander Graf <agraf@suse.de> Signed-off-by:
Avi Kivity <avi@redhat.com>
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Alexander Graf authored
We need to keep the pointer to the shadow vcpu somewhere accessible from within really early interrupt code. The best fit I found was the thread struct, as that resides in an SPRG. So let's put a pointer to the shadow vcpu in the thread struct and add an asm-offset so we can find it. Signed-off-by:
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Alexander Graf authored
When instruction fetch failed, the inline function hook automatically detects that and starts the internal guest memory load function. So whenever we access kvmppc_get_last_inst(), we're sure the result is sane. Signed-off-by:
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Alexander Graf authored
When we mapped a page as read-only, we can just release it as clean to KVM's page claim mechanisms, because we're pretty sure it hasn't been touched. Signed-off-by:
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Alexander Graf authored
We just introduced generic segment switching code that only needs to call small macros to do the actual switching, but keeps most of the entry / exit code generic. So let's move the SLB switching code over to use this new mechanism. Signed-off-by:
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Alexander Graf authored
Since we now have several fields in the shadow VCPU, we also change the internal calling convention between the different entry/exit code layers. Let's reflect that in the IR=1 code and make sure we use "long" defines for long field access. Signed-off-by:
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Alexander Graf authored
The real mode handler code was originally writen for 64 bit Book3S only. But since we not add 32 bit functionality too, we need to make some tweaks to it. This patch basically combines using the "long" access defines and using fields from the shadow VCPU we just moved there. Signed-off-by:
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Alexander Graf authored
The host shadow mmu code needs to get initialized. It needs to fetch a segment it can use to put shadow PTEs into. That initialization code was in generic code, which is icky. Let's move it over to the respective MMU file. Signed-off-by:
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Alexander Graf authored
The shadow vcpu now contains some fields we don't use from the vcpu anymore. Access to them happens using inline functions that happily use the shadow vcpu fields. So let's now ifdef them out to booke only and add asm-offsets. Signed-off-by:
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Alexander Graf authored
For assembly code there are several "long" load and store defines already. The one that's missing is the typical stack store, stdu/stwu. So let's add that define as well, making my KVM code happy. CC: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by:
Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by:
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Alexander Graf authored
Upstream recently added a new name for PPC64: Book3S_64. So instead of using CONFIG_PPC64 we should use CONFIG_PPC_BOOK3S consotently. That makes understanding the code easier (I hope). Signed-off-by:
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Alexander Graf authored
So far we had a lot of conditional code on CONFIG_KVM_BOOK3S_64_HANDLER. As we're moving towards common code between 32 and 64 bits, most of these ifdefs can be moved to a more generic term define, called CONFIG_KVM_BOOK3S_HANDLER. This patch adds the new generic config option and moves ifdefs over. Signed-off-by:
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Alexander Graf authored
We already have some inline fuctions we use to access vcpu or svcpu structs, depending on whether we're on booke or book3s. Since we just put a few more registers into the svcpu, we also need to make sure the respective callbacks are available and get used. So this patch moves direct use of the now in the svcpu struct fields to inline function calls. While at it, it also moves the definition of those inline function calls to respective header files for booke and book3s, greatly improving readability. Signed-off-by:
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Alexander Graf authored
After a lot of thought on how to make the entry / exit code easier, I figured it'd be clever to put even more register state into the shadow vcpu. That way we have more registers available to use, making the code easier to read. So this patch adds a few new fields to that shadow vcpu. Later on we will remove the originals from the vcpu and paca. Signed-off-by:
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Alexander Graf authored
In analogy to the 64 bit specific header file, this is the 32 bit pendant. With this in place we can just always call to_svcpu and be assured we get the right pointer anywhere. Signed-off-by:
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Alexander Graf authored
In the process of generalizing as much code as possible, I also moved the shadow vcpu code together to a generic book3s file. Unfortunately the location of the shadow vcpu is different on 32 and 64 bit, so we need a wrapper function to tell us where it is. That sounded like a perfect fit for a subarch specific header file. Here we can put anything that needs to be different between those two. Signed-off-by:
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Alexander Graf authored
We need to reserve a context from KVM to make sure we have our own segment space. While we did that split for Book3S_64 already, 32 bit is still outstanding. So let's split it now. Signed-off-by:
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Alexander Graf authored
This is the code that will later be used instead of book3s_64_slb.S. It does the last step of guest entry and the first generic steps of guest exiting, once we have determined the interrupt is a KVM interrupt. It also reads the last used instruction from the guest virtual address space if necessary, to speed up that path. The new thing about this file is that it makes use of generic long load and store functions and calls a macro to fill in the actual segment switching code. That still needs to be done differently for book3s_32 and book3s_64. Signed-off-by:
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Alexander Graf authored
Later in this series we will move the current segment switch code to generic code and make that call hooks for the specific sub-archs (32 vs. 64 bit). This is the hook for 32 bits. It enabled the entry and exit code to swap segment registers with values from the shadow cpu structure. Signed-off-by:
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Alexander Graf authored
In order to support 32 bit Book3S, we need to add code to enable our shadow MMU to actually add shadow PTEs. This is the module enabling that support. Signed-off-by:
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Alexander Graf authored
We have quite some code that can be used by Book3S_32 and Book3S_64 alike, so let's call it "Book3S" instead of "Book3S_64", so we can later on use it from the 32 bit port too. Signed-off-by:
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Wei Yongjun authored
Since gfn is not changed in the for loop, we do not need to call gfn_to_memslot_unaliased() under the loop, and it is safe to move it out. Signed-off-by:
Wei Yongjun <yjwei@cn.fujitsu.com> Signed-off-by:
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Gui Jianfeng authored
Nobody use gva_to_page() anymore, get rid of it. Signed-off-by:
Gui Jianfeng <guijianfeng@cn.fujitsu.com> Signed-off-by:
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Gui Jianfeng authored
Remove unused varialbe in rmap_next() Signed-off-by:
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Gui Jianfeng authored
Make use of is_large_pte() instead of checking PT_PAGE_SIZE_MASK bit directly. Signed-off-by:
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Gui Jianfeng authored
Move first pte address calculation out of loop to save some cycles. Signed-off-by:
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Lai Jiangshan authored
When CPU_UP_CANCELED, hardware_enable() has not been called at the CPU which is going up because raw_notifier_call_chain(CPU_ONLINE) has not been called for this cpu. Drop the handling for CPU_UP_CANCELED. Signed-off-by:
Lai Jiangshan <laijs@cn.fujitsu.com> Signed-off-by:
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Avi Kivity authored
Since commit bf47a760, we no longer handle ptes with the global bit set specially, so there is no reason to distinguish between shadow pages created with cr4.gpe set and clear. Such tracking is expensive when the guest toggles cr4.pge, so drop it. Signed-off-by:
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Lai Jiangshan authored
The RCU/SRCU API have already changed for proving RCU usage. I got the following dmesg when PROVE_RCU=y because we used incorrect API. This patch coverts rcu_deference() to srcu_dereference() or family API. =================================================== [ INFO: suspicious rcu_dereference_check() usage. ] --------------------------------------------------- arch/x86/kvm/mmu.c:3020 invoked rcu_dereference_check() without protection! other info that might help us debug this: rcu_scheduler_active = 1, debug_locks = 0 2 locks held by qemu-system-x86/8550: #0: (&kvm->slots_lock){+.+.+.}, at: [<ffffffffa011a6ac>] kvm_set_memory_region+0x29/0x50 [kvm] #1: (&(&kvm->mmu_lock)->rlock){+.+...}, at: [<ffffffffa012262d>] kvm_arch_commit_memory_region+0xa6/0xe2 [kvm] stack backtrace: Pid: 8550, comm: qemu-system-x86 Not tainted 2.6.34-rc4-tip-01028-g939eab1 #27 Call Trace: [<ffffffff8106c59e>] lockdep_rcu_dereference+0xaa/0xb3 [<ffffffffa012f6c1>] kvm_mmu_calculate_mmu_pages+0x44/0x7d [kvm] [<ffffffffa012263e>] kvm_arch_commit_memory_region+0xb7/0xe2 [kvm] [<ffffffffa011a5d7>] __kvm_set_memory_region+0x636/0x6e2 [kvm] [<ffffffffa011a6ba>] kvm_set_memory_region+0x37/0x50 [kvm] [<ffffffffa015e956>] vmx_set_tss_addr+0x46/0x5a [kvm_intel] [<ffffffffa0126592>] kvm_arch_vm_ioctl+0x17a/0xcf8 [kvm] [<ffffffff810a8692>] ? unlock_page+0x27/0x2c [<ffffffff810bf879>] ? __do_fault+0x3a9/0x3e1 [<ffffffffa011b12f>] kvm_vm_ioctl+0x364/0x38d [kvm] [<ffffffff81060cfa>] ? up_read+0x23/0x3d [<ffffffff810f3587>] vfs_ioctl+0x32/0xa6 [<ffffffff810f3b19>] do_vfs_ioctl+0x495/0x4db [<ffffffff810e6b2f>] ? fget_light+0xc2/0x241 [<ffffffff810e416c>] ? do_sys_open+0x104/0x116 [<ffffffff81382d6d>] ? retint_swapgs+0xe/0x13 [<ffffffff810f3ba6>] sys_ioctl+0x47/0x6a [<ffffffff810021db>] system_call_fastpath+0x16/0x1b Signed-off-by: -
Avi Kivity authored
Signed-off-by: -
Xiao Guangrong authored
Quote from Avi: |Just change the assignment to a 'goto restart;' please, |I don't like playing with list_for_each internals. Signed-off-by:
Xiao Guangrong <xiaoguangrong@cn.fujitsu.com> Signed-off-by:
Marcelo Tosatti <mtosatti@redhat.com>
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Gleb Natapov authored
If kvm_task_switch() fails code exits to userspace without specifying exit reason, so the previous exit reason is reused by userspace. Fix this by specifying exit reason correctly. Signed-off-by:
Gleb Natapov <gleb@redhat.com> Signed-off-by:
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Xiao Guangrong authored
'vcpu' is unused, remove it Signed-off-by:
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Xiao Guangrong authored
Define 'multimapped' as 'bool'. Signed-off-by:
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Xiao Guangrong authored
Remove 'struct kvm_unsync_walk' since it's not used. Signed-off-by:
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Gleb Natapov authored
emulator_task_switch() should return -1 for failure and 0 for success to the caller, just like x86_emulate_insn() does. Signed-off-by:
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Avi Kivity authored
There is no real distinction between glevels=3 and glevels=4; both have exactly the same format and the code is treated exactly the same way. Drop role.glevels and replace is with role.cr4_pae (which is meaningful). This simplifies the code a bit. As a side effect, it allows sharing shadow page tables between pae and longmode guest page tables at the same guest page. Signed-off-by:
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Jan Kiszka authored
When a fault triggers a task switch, the error code, if existent, has to be pushed on the new task's stack. Implement the missing bits. Signed-off-by:
Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by:
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Jan Kiszka authored
Stop the switch immediately if task_switch_16/32 returned an error. Only if that step succeeded, the switch should actually take place and update any register states. Signed-off-by:
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Gleb Natapov authored
We can call kvm_mmu_pte_write() directly from emulator_cmpxchg_emulated() instead of passing mmu_only down to emulator_write_emulated_onepage() and call it there. Signed-off-by:
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