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With Nested Paging emulation the NX state between the two
MMU contexts may differ. To make sure that always the right
fault error code is recorded this patch moves the NX state
into struct kvm_mmu so that the code can distinguish between
L1 and L2 NX state.
Signed-off-by: Joerg Roedel <[email protected]>
Signed-off-by: Avi Kivity <[email protected]>
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Currently the KVM softmmu implementation can not shadow a 32
bit legacy or PAE page table with a long mode page table.
This is a required feature for nested paging emulation
because the nested page table must alway be in host format.
So this patch implements the missing pieces to allow long
mode page tables for page table types.
Signed-off-by: Joerg Roedel <[email protected]>
Signed-off-by: Avi Kivity <[email protected]>
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This patch factors out the direct-mapping paths of the
mmu_alloc_roots function into a seperate function. This
makes it a lot easier to avoid all the unnecessary checks
done in the shadow path which may break when running direct.
In fact, this patch already fixes a problem when running PAE
guests on a PAE shadow page table.
Signed-off-by: Joerg Roedel <[email protected]>
Signed-off-by: Avi Kivity <[email protected]>
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This function is implemented to load the pdptr pointers of
the currently running guest (l1 or l2 guest). Therefore it
takes care about the current paging mode and can read pdptrs
out of l2 guest physical memory.
Signed-off-by: Joerg Roedel <[email protected]>
Signed-off-by: Avi Kivity <[email protected]>
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This function need to be able to load the pdptrs from any
mmu context currently in use. So change this function to
take an kvm_mmu parameter to fit these needs.
As a side effect this patch also moves the cached pdptrs
from vcpu_arch into the kvm_mmu struct.
Signed-off-by: Joerg Roedel <[email protected]>
Signed-off-by: Avi Kivity <[email protected]>
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KVM currently ignores fetch faults in the instruction
emulator. With nested-npt we could have such faults. This
patch adds the code to handle these.
Signed-off-by: Joerg Roedel <[email protected]>
Signed-off-by: Avi Kivity <[email protected]>
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This patch implements logic to make sure that either a
page-fault/page-fault-vmexit or a nested-page-fault-vmexit
is propagated back to the guest.
Signed-off-by: Joerg Roedel <[email protected]>
Signed-off-by: Avi Kivity <[email protected]>
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This patch introduces the init_kvm_nested_mmu() function
which is used to re-initialize the nested mmu when the l2
guest changes its paging mode.
Signed-off-by: Joerg Roedel <[email protected]>
Signed-off-by: Avi Kivity <[email protected]>
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This patch introduces the kvm_read_guest_page_x86 function
which reads from the physical memory of the guest. If the
guest is running in guest-mode itself with nested paging
enabled it will read from the guest's guest physical memory
instead.
The patch also changes changes the code to use this function
where it is necessary.
Signed-off-by: Joerg Roedel <[email protected]>
Signed-off-by: Avi Kivity <[email protected]>
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This patch uses kvm_read_guest_page_tdp to make the
walk_addr_generic functions suitable for two-level page
table walking.
Signed-off-by: Joerg Roedel <[email protected]>
Signed-off-by: Avi Kivity <[email protected]>
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This patch adds a function which can read from the guests
physical memory or from the guest's guest physical memory.
This will be used in the two-dimensional page table walker.
Signed-off-by: Joerg Roedel <[email protected]>
Signed-off-by: Avi Kivity <[email protected]>
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This patch adds the functions to do a nested l2_gva to
l1_gpa page table walk.
Signed-off-by: Joerg Roedel <[email protected]>
Signed-off-by: Avi Kivity <[email protected]>
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This patch introduces the walk_mmu pointer which points to
the mmu-context currently used for gva_to_gpa translations.
Signed-off-by: Joerg Roedel <[email protected]>
Signed-off-by: Avi Kivity <[email protected]>
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This patch introduces a mmu-callback to translate gpa
addresses in the walk_addr code. This is later used to
translate l2_gpa addresses into l1_gpa addresses.
Signed-off-by: Joerg Roedel <[email protected]>
Signed-off-by: Avi Kivity <[email protected]>
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This is the first patch in the series towards a generic
walk_addr implementation which could walk two-dimensional
page tables in the end. In this first step the walk_addr
function is renamed into walk_addr_generic which takes a
mmu context as an additional parameter.
Signed-off-by: Joerg Roedel <[email protected]>
Signed-off-by: Avi Kivity <[email protected]>
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This patch introduces a struct with two new fields in
vcpu_arch for x86:
* fault.address
* fault.error_code
This will be used to correctly propagate page faults back
into the guest when we could have either an ordinary page
fault or a nested page fault. In the case of a nested page
fault the fault-address is different from the original
address that should be walked. So we need to keep track
about the real fault-address.
Signed-off-by: Joerg Roedel <[email protected]>
Signed-off-by: Avi Kivity <[email protected]>
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This patch changes is_rsvd_bits_set() function prototype to
take only a kvm_mmu context instead of a full vcpu.
Signed-off-by: Joerg Roedel <[email protected]>
Signed-off-by: Avi Kivity <[email protected]>
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Some logic of the init_kvm_softmmu function is required to
build the Nested Nested Paging context. So factor the
required logic into a seperate function and export it.
Also make the whole init path suitable for more than one mmu
context.
Signed-off-by: Joerg Roedel <[email protected]>
Signed-off-by: Avi Kivity <[email protected]>
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This patch introduces an inject_page_fault function pointer
into struct kvm_mmu which will be used to inject a page
fault. This will be used later when Nested Nested Paging is
implemented.
Signed-off-by: Joerg Roedel <[email protected]>
Signed-off-by: Avi Kivity <[email protected]>
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This function pointer in the MMU context is required to
implement Nested Nested Paging.
Signed-off-by: Joerg Roedel <[email protected]>
Signed-off-by: Avi Kivity <[email protected]>
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This patch introduces a special set_tdp_cr3 function pointer
in kvm_x86_ops which is only used for tpd enabled mmu
contexts. This allows to remove some hacks from svm code.
Signed-off-by: Joerg Roedel <[email protected]>
Signed-off-by: Avi Kivity <[email protected]>
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This is necessary to implement Nested Nested Paging. As a
side effect this allows some cleanups in the SVM nested
paging code.
Signed-off-by: Joerg Roedel <[email protected]>
Signed-off-by: Avi Kivity <[email protected]>
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This patch changes the tdp_enabled flag from its global
meaning to the mmu-context and renames it to direct_map
there. This is necessary for Nested SVM with emulation of
Nested Paging where we need an extra MMU context to shadow
the Nested Nested Page Table.
Signed-off-by: Joerg Roedel <[email protected]>
Signed-off-by: Avi Kivity <[email protected]>
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The walk_addr function checks for !is_long_mode in its 64
bit version. But what is meant here is a check for pae
paging. Change the condition to really check for pae paging
so that it also works with nested nested paging.
Signed-off-by: Joerg Roedel <[email protected]>
Signed-off-by: Avi Kivity <[email protected]>
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Some operating systems store data about the host processor at the
time of installation, and when booted on a more uptodate cpu tries
to read MSR_EBC_FREQUENCY_ID. This has been found with XP.
Signed-off-by: Jes Sorensen <[email protected]>
Reviewed-by: Juan Quintela <[email protected]>
Signed-off-by: Marcelo Tosatti <[email protected]>
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Signed-off-by: Jes Sorensen <[email protected]>
Signed-off-by: Marcelo Tosatti <[email protected]>
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This patch changes the rip handling in the vmrun emulation
path from using next_rip to the generic kvm register access
functions.
Signed-off-by: Joerg Roedel <[email protected]>
Signed-off-by: Marcelo Tosatti <[email protected]>
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This patch implements restoring of the correct rip, rsp, and
rax after the svm emulation in KVM injected a selective_cr0
write intercept into the guest hypervisor. The problem was
that the vmexit is emulated in the instruction emulation
which later commits the registers right after the write-cr0
instruction. So the l1 guest will continue to run with the
l2 rip, rsp and rax resulting in unpredictable behavior.
This patch is not the final word, it is just an easy patch
to fix the issue. The real fix will be done when the
instruction emulator is made aware of nested virtualization.
Until this is done this patch fixes the issue and provides
an easy way to fix this in -stable too.
Cc: [email protected]
Signed-off-by: Joerg Roedel <[email protected]>
Signed-off-by: Marcelo Tosatti <[email protected]>
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This patch fixes 32 bit legacy paging with NPT enabled. The
mmu_check_root call on the top-level of the loop causes
root_gfn to take values (in the tdp_enabled path) which are
outside of guest memory. So the mmu_check_root call fails at
some point in the loop interation causing the guest to
tiple-fault.
This patch changes the mmu_check_root calls to the places
where they are really necessary. As a side-effect it
introduces a check for the root of a pae page table too.
Signed-off-by: Joerg Roedel <[email protected]>
Signed-off-by: Marcelo Tosatti <[email protected]>
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We have to protect the include for linux/of.h by __KERNEL__ so it doesn't
accidently get referenced outside.
This patch fixes this and makes the tree compile again.
Reported-by: Stephen Rothwell <[email protected]>
Signed-off-by: Alexander Graf <[email protected]>
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This documents how to detect additional features inside the magic
page when a guest maps it.
Signed-off-by: Alexander Graf <[email protected]>
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The e500_tlb.c file didn't compile for me due to the following error:
arch/powerpc/kvm/e500_tlb.c: In function ‘kvmppc_e500_shadow_map’:
arch/powerpc/kvm/e500_tlb.c:300: error: format ‘%lx’ expects type ‘long unsigned int’, but argument 2 has type ‘gfn_t’
So let's explicitly cast the argument to make printk happy.
Signed-off-by: Alexander Graf <[email protected]>
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The kvmppc_e500_stlbe_invalidate() function was trying to pass too many
parameters to trace_kvm_stlb_inval(). This appears to be a bad
copy-paste from a call to trace_kvm_stlb_write().
Signed-off-by: Kyle Moffett <[email protected]>
Signed-off-by: Alexander Graf <[email protected]>
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This adds some documentation for the KVM_INTERRUPT special cases that
PowerPC now implements.
Signed-off-by: Alexander Graf <[email protected]>
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BookE also wants to support level based interrupts, so let's implement
all the necessary logic there. We need to trick a bit here because the
irqprios are 1:1 assigned to architecture defined values. But since there
is some space left there, we can just pick a random one and move it later
on - it's internal anyways.
Signed-off-by: Alexander Graf <[email protected]>
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Now that we have all the level interrupt magic in place, let's
expose the capability to user space, so it can make use of it!
Signed-off-by: Alexander Graf <[email protected]>
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The current interrupt logic is just completely broken. We get a notification
from user space, telling us that an interrupt is there. But then user space
expects us that we just acknowledge an interrupt once we deliver it to the
guest.
This is not how real hardware works though. On real hardware, the interrupt
controller pulls the external interrupt line until it gets notified that the
interrupt was received.
So in reality we have two events: pulling and letting go of the interrupt line.
To maintain backwards compatibility, I added a new request for the pulling
part. The letting go part was implemented earlier already.
With this in place, we can now finally start guests that do not randomly stall
and stop to work at random times.
This patch implements above logic for Book3S.
Signed-off-by: Alexander Graf <[email protected]>
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Before I incorrectly enabled napping also for BookE, which would result in
needless dcache flushes. Since we only need to force enable napping on
Book3s_64 because it doesn't go into MSR_POW otherwise, we can just #ifdef
that code to this particular platform.
Reported-by: Scott Wood <[email protected]>
Signed-off-by: Alexander Graf <[email protected]>
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Match only the first part of cur_cpu_spec->platform.
440GP (the first 440 processor) is identified by the string "ppc440gp", while
all later 440 processors use simply "ppc440".
Signed-off-by: Hollis Blanchard <[email protected]>
Signed-off-by: Alexander Graf <[email protected]>
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Missing local variable.
Signed-off-by: Hollis Blanchard <[email protected]>
Signed-off-by: Alexander Graf <[email protected]>
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Developers can now tell at a glace the exact type of the premature interrupt,
instead of just knowing that there was some premature interrupt.
Signed-off-by: Hollis Blanchard <[email protected]>
Signed-off-by: Alexander Graf <[email protected]>
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On Book3S a mtmsr with the MSR_POW bit set indicates that the OS is in
idle and only needs to be waked up on the next interrupt.
Now, unfortunately we let that bit slip into the stored MSR value which
is not what the real CPU does, so that we ended up executing code like
this:
r = mfmsr();
/* r containts MSR_POW */
mtmsr(r | MSR_EE);
This obviously breaks, as we're going into idle mode in code sections that
don't expect to be idling.
This patch masks MSR_POW out of the stored MSR value on wakeup, making
guests happy again.
Signed-off-by: Alexander Graf <[email protected]>
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Up until now we were doing segment mappings wrong on Book3s_32. For Book3s_64
we were using a trick where we know that a single mmu_context gives us 16 bits
of context ids.
The mm system on Book3s_32 instead uses a clever algorithm to distribute VSIDs
across the available range, so a context id really only gives us 16 available
VSIDs.
To keep at least a few guest processes in the SID shadow, let's map a number of
contexts that we can use as VSID pool. This makes the code be actually correct
and shouldn't hurt performance too much.
Signed-off-by: Alexander Graf <[email protected]>
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There are some heuristics in the PPC power management code that try to find
out if the particular hardware we're running on supports proper power management
or just hangs the machine when going into nap mode.
Since we know that KVM is safe with nap, let's force enable it in the PV code
once we're certain that we are on a KVM VM.
Signed-off-by: Alexander Graf <[email protected]>
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We had an arbitrary limitation in mtmsrd L=1 that kept us from using r30 and
r31 as input registers. Let's get rid of that and get more potential speedups!
Signed-off-by: Alexander Graf <[email protected]>
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When having a decrementor interrupt pending, the dequeuing happens manually
through an mtdec instruction. This instruction simply calls dequeue on that
interrupt, so the int_pending hint doesn't get updated.
This patch enables updating the int_pending hint also on dequeue, thus
correctly enabling guests to stay in guest contexts more often.
Signed-off-by: Alexander Graf <[email protected]>
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So far we've been restricting ourselves to r0-r29 as registers an mtmsr
instruction could use. This was bad, as there are some code paths in
Linux actually using r30.
So let's instead handle all registers gracefully and get rid of that
stupid limitation
Signed-off-by: Alexander Graf <[email protected]>
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This is the guest side of the mtsr acceleration. Using this a guest can now
call mtsrin with almost no overhead as long as it ensures that it only uses
it with (MSR_IR|MSR_DR) == 0. Linux does that, so we're good.
Signed-off-by: Alexander Graf <[email protected]>
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Now that the actual mtsr doesn't do anything anymore, we can move the sr
contents over to the shared page, so a guest can directly read and write
its sr contents from guest context.
Signed-off-by: Alexander Graf <[email protected]>
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Right now we're examining the contents of Book3s_32's segment registers when
the register is written and put the interpreted contents into a struct.
There are two reasons this is bad. For starters, the struct has worse real-time
performance, as it occupies more ram. But the more important part is that with
segment registers being interpreted from their raw values, we can put them in
the shared page, allowing guests to mess with them directly.
This patch makes the internal representation of SRs be u32s.
Signed-off-by: Alexander Graf <[email protected]>
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