The value returned from CPUID is the maximum number for virtual
processors supported by Hyper-V. It could be larger than the maximum
number of virtual processors configured.
Stash the configured number into a variable and use it in calculations.
Signed-off-by: Wei Liu <liuwe@microsoft.com>
Reviewed-by: Roger Pau Monné <roger.pau@citrix.com>
VP assist page is rather important as we need to toggle some bits in it
for efficient nested virtualisation.
Signed-off-by: Wei Liu <liuwe@microsoft.com>
Reviewed-by: Paul Durrant <pdurrant@amazon.com>
Reviewed-by: Roger Pau Monné <roger.pau@citrix.com>
This will be useful when invoking hypercall that targets specific
vcpu(s).
Signed-off-by: Wei Liu <liuwe@microsoft.com>
Reviewed-by: Paul Durrant <paul@xen.org>
Acked-by: Jan Beulich <jbeulich@suse.com>
Hyper-V's input / output argument must be 8 bytes aligned an not cross
page boundary. One way to satisfy those requirements is to use percpu
page.
For the foreseeable future we only need to provide input for TLB
and APIC hypercalls, so skip setting up an output page.
We will also need to provide an ap_setup hook for secondary cpus to
setup its own input page.
Signed-off-by: Wei Liu <liuwe@microsoft.com>
Reviewed-by: Paul Durrant <pdurrant@amazon.com>
Reviewed-by: Roger Pau Monné <roger.pau@citrix.com>
Hyper-V uses a technique called overlay page for its hypercall page. It
will insert a backing page to the guest when the hypercall functionality
is enabled. That means we can use a page that is not backed by real
memory for hypercall page.
To avoid shattering L0 superpages and treading on any MMIO areas
residing in low addresses, use the top-most addressable page for that
purpose. Adjust e820 map accordingly.
We also need to register Xen's guest OS ID to Hyper-V. Use 0x3 as the
vendor ID. Fix the comment in hyperv-tlfs.h while at it.
Signed-off-by: Wei Liu <liuwe@microsoft.com>
Reviewed-by: Roger Pau Monné <roger.pau@citrix.com>
Acked-by: Paul Durrant <pdurrant@amazon.com>
This allows us to set aside some address space for executable mapping.
This fixed map range starts from XEN_VIRT_END so that it is within reach
of the .text section.
Shift the percpu stub range and shrink livepatch range accordingly.
Signed-off-by: Wei Liu <liuwe@microsoft.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Push hypervisor_ap_setup down to smp_callin.
Take the chance to replace xen_guest with cpu_has_hypervisor.
Signed-off-by: Wei Liu <liuwe@microsoft.com>
Reviewed-by: Roger Pau Monné <roger.pau@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
We want to be able to handle AP setup error in the upper layer.
For Xen, remove all panic() and BUG_ON() in init_evtchn and
map_vcpuinfo. Only panic/BUG_ON when Xen can't fail gracefully.
Signed-off-by: Wei Liu <liuwe@microsoft.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Move early_cpu_init before init_e820, such that paddr_bits can be used
by e820 code.
This will reduce code repetition and prepare for further adjustment when
L0 hypervisor comes into play.
Signed-off-by: Wei Liu <liuwe@microsoft.com>
Reviewed-by: Roger Pau Monné <roger.pau@citrix.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
All structures are already naturally aligned. Linux added those
attributes out of paranoia.
In Xen we've had instance we had to drop pointless __packed to placate
gcc 9 (see ca9310b24e "x86/IO-APIC: fix build with gcc9"), it is better
to drop those attributes in hyperv-tlfs.h as well.
Requested-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: Wei Liu <liuwe@microsoft.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
I'm told that GENMASK_ULL shouldn't be used outside of Arm code in its
current form.
Requested-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: Wei Liu <liuwe@microsoft.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
We will provide a header file for Hyper-V hypercalls.
No functional change.
Signed-off-by: Wei Liu <liuwe@microsoft.com>
Reviewed-by: Paul Durrant <paul@xen.org>
Acked-by: Jan Beulich <jbeulich@suse.com>
Use hv_synic_sint in hyperv-tlfs.h instead.
This requires adding the missing "polling" member to hv_synic_sint.
No functional change.
Signed-off-by: Wei Liu <liuwe@microsoft.com>
Reviewed-by: Paul Durrant <paul@xen.org>
The Hyper-V clock source and Xen's own viridian code need the same
functionality.
Move the function in viridian/time.c to hyperv.h and use it in both
places.
No functional change.
Signed-off-by: Wei Liu <liuwe@microsoft.com>
Reviewed-by: Paul Durrant <paul@xen.org>
Use the one defined in hyperv-tlfs.h instead. No functional change
intended.
Signed-off-by: Wei Liu <liuwe@microsoft.com>
Reviewed-by: Paul Durrant <paul@xen.org>
Also add HVCALL_EXT_CALL_QUERY_CAPABILITIES to hyperv-tlfs.h.
HvGetPartitionID was never used in code so just dropped it.
No functional change intended.
Signed-off-by: Wei Liu <liuwe@microsoft.com>
Reviewed-by: Paul Durrant <paul@xen.org>
Provide a structure to store that information. The structure will be
accessed from other places later so make it public.
Signed-off-by: Wei Liu <liuwe@microsoft.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
Take a pristine copy from Linux commit b2d8b167e15bb5ec2691d1119c025630a247f649.
Do the following to fix it up for Xen:
1. include xen/types.h and xen/bitops.h
2. fix up invocations of BIT macro
Signed-off-by: Wei Liu <liuwe@microsoft.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
We use the same code structure as we did for Xen.
As starters, detect Hyper-V in probe routine. More complex
functionalities will be added later.
Signed-off-by: Wei Liu <liuwe@microsoft.com>
Reviewed-by: Paul Durrant <pdurrant@amazon.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
We will soon implement Hyper-V support for Xen. Add a framework for
that.
This requires moving some of the hypervisor_* functions from xen.h to
hypervisor.h.
Signed-off-by: Wei Liu <liuwe@microsoft.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
The only user is Xen specific code in PV shim. We can therefore export
the variable directly.
Move __read_mostly to its standard place while at it.
Signed-off-by: Wei Liu <liuwe@microsoft.com>
Reviewed-by: Roger Pau Monné <roger.pau@citrix.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
Include asm_defns.h because ASM_CALL_CONSTRAINT is defined there.
Include xen/lib.h because we need ASSERT_UNREACHABLE.
No functional change.
Signed-off-by: Wei Liu <liuwe@microsoft.com>
Reviewed-by: Roger Pau Monné <roger.pau@citrix.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
Xen is able to run as a guest on Xen. We plan to make it able to run
on Hyper-V as well.
Introduce CONFIG_GUEST which is set to true if either running on Xen
or Hyper-V is desired. Restructure code hierarchy for new code to
come.
No functional change intended.
Signed-off-by: Wei Liu <liuwe@microsoft.com>
Reviewed-by: Roger Pau Monné <roger.pau@citrix.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
Wei Liu