- 24 Oct, 2010 40 commits
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Alexander Graf authored
There is also a form of mtmsr where all bits need to be addressed. While the PPC64 Linux kernel behaves resonably well here, on PPC32 we do not have an L=1 form. It does mtmsr even for simple things like only changing EE. So we need to hook into that one as well and check for a mask of bits that we deem safe to change from within guest context. Signed-off-by:
Alexander Graf <agraf@suse.de> Signed-off-by:
Avi Kivity <avi@redhat.com>
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Alexander Graf authored
The PowerPC ISA has a special instruction for mtmsr that only changes the EE and RI bits, namely the L=1 form. Since that one is reasonably often occuring and simple to implement, let's go with this first. Writing EE=0 is always just a store. Doing EE=1 also requires us to check for pending interrupts and if necessary exit back to the hypervisor. Signed-off-by:
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Alexander Graf authored
When we hook an instruction we need to make sure we don't clobber any of the registers at that point. So we write them out to scratch space in the magic page. To make sure we don't fall into a race with another piece of hooked code, we need to disable interrupts. To make the later patches and code in general easier readable, let's introduce a set of defines that save and restore r30, r31 and cr. Let's also define some helpers to read the lower 32 bits of a 64 bit field on 32 bit systems. Signed-off-by:
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Alexander Graf authored
We will need to patch several instruction streams over to a different code path, so we need a way to patch a single instruction with a branch somewhere else. This patch adds a helper to facilitate this patching. Signed-off-by:
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Alexander Graf authored
We will soon require more sophisticated methods to replace single instructions with multiple instructions. We do that by branching to a memory region where we write replacement code for the instruction to. This region needs to be within 32 MB of the patched instruction though, because that's the furthest we can jump with immediate branches. So we keep 1MB of free space around in bss. After we're done initing we can just tell the mm system that the unused pages are free, but until then we have enough space to fit all our code in. Signed-off-by:
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Alexander Graf authored
With our current MMU scheme we don't need to know about the tlbsync instruction. So we can just nop it out. Signed-off-by:
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Alexander Graf authored
Some instructions can simply be replaced by load and store instructions to or from the magic page. This patch replaces often called instructions that fall into the above category. Signed-off-by:
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Alexander Graf authored
We will soon start and replace instructions from the text section with other, paravirtualized versions. To ease the readability of those patches I split out the generic looping and magic page mapping code out. This patch still only contains stubs. But at least it loops through the text section :). Signed-off-by:
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Alexander Graf authored
We have all the hypervisor pieces in place now, but the guest parts are still missing. This patch implements basic awareness of KVM when running Linux as guest. It doesn't do anything with it yet though. Signed-off-by:
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Alexander Graf authored
Currently x86 is the only architecture that uses kvm_guest_init(). With PowerPC we're getting a second user, but the signature is different there and we don't need to export it, as it uses the normal kernel init framework. So let's move the x86 specific definition of that function over to the x86 specfic header file. Signed-off-by:
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Alexander Graf authored
Now that we have the shared page in place and the MMU code knows about the magic page, we can expose that capability to the guest! Signed-off-by:
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Alexander Graf authored
We need to override EA as well as PA lookups for the magic page. When the guest tells us to project it, the magic page overrides any guest mappings. In order to reflect that, we need to hook into all the MMU layers of KVM to force map the magic page if necessary. Signed-off-by:
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Alexander Graf authored
We will be introducing a method to project the shared page in guest context. As soon as we're talking about this coupling, the shared page is colled magic page. This patch introduces simple defines, so the follow-up patches are easier to read. Signed-off-by:
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Alexander Graf authored
On PowerPC it's very normal to not support all of the physical RAM in real mode. To check if we're matching on the shared page or not, we need to know the limits so we can restrain ourselves to that range. So let's make it a define instead of open-coding it. And while at it, let's also increase it. Signed-off-by:
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Alexander Graf authored
When the guest turns on interrupts again, it needs to know if we have an interrupt pending for it. Because if so, it should rather get out of guest context and get the interrupt. So we introduce a new field in the shared page that we use to tell the guest that there's a pending interrupt lying around. Signed-off-by:
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Alexander Graf authored
While running in hooked code we need to store register contents out because we must not clobber any registers. So let's add some fields to the shared page we can just happily write to. Signed-off-by:
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Alexander Graf authored
When running in hooked code we need a way to disable interrupts without clobbering any interrupts or exiting out to the hypervisor. To achieve this, we have an additional critical field in the shared page. If that field is equal to the r1 register of the guest, it tells the hypervisor that we're in such a critical section and thus may not receive any interrupts. Signed-off-by:
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Alexander Graf authored
To communicate with KVM directly we need to plumb some sort of interface between the guest and KVM. Usually those interfaces use hypercalls. This hypercall implementation is described in the last patch of the series in a special documentation file. Please read that for further information. This patch implements stubs to handle KVM PPC hypercalls on the host and guest side alike. Signed-off-by:
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Alexander Graf authored
When in kernel mode there are 4 additional registers available that are simple data storage. Instead of exiting to the hypervisor to read and write those, we can just share them with the guest using the page. This patch converts all users of the current field to the shared page. Signed-off-by:
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Alexander Graf authored
The SRR0 and SRR1 registers contain cached values of the PC and MSR respectively. They get written to by the hypervisor when an interrupt occurs or directly by the kernel. They are also used to tell the rfi(d) instruction where to jump to. Because it only gets touched on defined events that, it's very simple to share with the guest. Hypervisor and guest both have full r/w access. This patch converts all users of the current field to the shared page. Signed-off-by:
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Alexander Graf authored
The DAR register contains the address a data page fault occured at. This register behaves pretty much like a simple data storage register that gets written to on data faults. There is no hypervisor interaction required on read or write. This patch converts all users of the current field to the shared page. Signed-off-by:
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Alexander Graf authored
The DSISR register contains information about a data page fault. It is fully read/write from inside the guest context and we don't need to worry about interacting based on writes of this register. This patch converts all users of the current field to the shared page. Signed-off-by:
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Alexander Graf authored
One of the most obvious registers to share with the guest directly is the MSR. The MSR contains the "interrupts enabled" flag which the guest has to toggle in critical sections. So in order to bring the overhead of interrupt en- and disabling down, let's put msr into the shared page. Keep in mind that even though you can fully read its contents, writing to it doesn't always update all state. There are a few safe fields that don't require hypervisor interaction. See the documentation for a list of MSR bits that are safe to be set from inside the guest. Signed-off-by:
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Alexander Graf authored
For transparent variable sharing between the hypervisor and guest, I introduce a shared page. This shared page will contain all the registers the guest can read and write safely without exiting guest context. This patch only implements the stubs required for the basic structure of the shared page. The actual register moving follows. Signed-off-by:
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Mohammed Gamal authored
If a nop instruction is encountered, we jump directly to the done label. This skip updating rip. Break from the switch case instead Signed-off-by:
Mohammed Gamal <m.gamal005@gmail.com> Signed-off-by:
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Avi Kivity authored
Since modrm operand can be either register or memory, decoding it into a 'struct operand', which can represent both, is simpler. Signed-off-by: -
Avi Kivity authored
Instead of using modrm_ea, which will soon be gone. Signed-off-by: -
Avi Kivity authored
The NoAccess flag will prevent memory from being accessed. Signed-off-by: -
Avi Kivity authored
Use for INVLPG, which accesses the tlb, not memory. Signed-off-by: -
Avi Kivity authored
This is an ordinary modrm source or destination; use the standard structure representing it. Signed-off-by: -
Avi Kivity authored
This is an ordinary modrm source or destination; use the standard structure representing it. Signed-off-by: -
Avi Kivity authored
Signed-off-by: -
Avi Kivity authored
The operands for these instructions are 32 bits or 64 bits, depending on long mode, and ignoring REX prefixes, or the operand size prefix. Signed-off-by: -
Avi Kivity authored
(x && (x & y)) == (x & y) Signed-off-by: -
Avi Kivity authored
Unused (and has never been). Signed-off-by: -
Avi Kivity authored
The code is repeated three times, put it into fetch_register_operand() Signed-off-by: -
Avi Kivity authored
Signed-off-by: -
Avi Kivity authored
Use X8() to avoid repetition. Signed-off-by: -
Avi Kivity authored
Currently we use a void pointer for memory addresses. That's wrong since these are guest virtual addresses which are not directly dereferencable by the host. Use the correct type, unsigned long. Signed-off-by: -
Avi Kivity authored
Let it compute modrm_seg instead, and have the caller apply it. Signed-off-by:
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