linux-toradex.git/arch/x86/include/asm/fpu, branch v5.18

Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm

2022-01-16T14:15:14+00:00

Pull kvm updates from Paolo Bonzini:
 "RISCV:

   - Use common KVM implementation of MMU memory caches

   - SBI v0.2 support for Guest

   - Initial KVM selftests support

   - Fix to avoid spurious virtual interrupts after clearing hideleg CSR

   - Update email address for Anup and Atish

  ARM:

   - Simplification of the 'vcpu first run' by integrating it into KVM's
     'pid change' flow

   - Refactoring of the FP and SVE state tracking, also leading to a
     simpler state and less shared data between EL1 and EL2 in the nVHE
     case

   - Tidy up the header file usage for the nvhe hyp object

   - New HYP unsharing mechanism, finally allowing pages to be unmapped
     from the Stage-1 EL2 page-tables

   - Various pKVM cleanups around refcounting and sharing

   - A couple of vgic fixes for bugs that would trigger once the vcpu
     xarray rework is merged, but not sooner

   - Add minimal support for ARMv8.7's PMU extension

   - Rework kvm_pgtable initialisation ahead of the NV work

   - New selftest for IRQ injection

   - Teach selftests about the lack of default IPA space and page sizes

   - Expand sysreg selftest to deal with Pointer Authentication

   - The usual bunch of cleanups and doc update

  s390:

   - fix sigp sense/start/stop/inconsistency

   - cleanups

  x86:

   - Clean up some function prototypes more

   - improved gfn_to_pfn_cache with proper invalidation, used by Xen
     emulation

   - add KVM_IRQ_ROUTING_XEN_EVTCHN and event channel delivery

   - completely remove potential TOC/TOU races in nested SVM consistency
     checks

   - update some PMCs on emulated instructions

   - Intel AMX support (joint work between Thomas and Intel)

   - large MMU cleanups

   - module parameter to disable PMU virtualization

   - cleanup register cache

   - first part of halt handling cleanups

   - Hyper-V enlightened MSR bitmap support for nested hypervisors

  Generic:

   - clean up Makefiles

   - introduce CONFIG_HAVE_KVM_DIRTY_RING

   - optimize memslot lookup using a tree

   - optimize vCPU array usage by converting to xarray"

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (268 commits)
  x86/fpu: Fix inline prefix warnings
  selftest: kvm: Add amx selftest
  selftest: kvm: Move struct kvm_x86_state to header
  selftest: kvm: Reorder vcpu_load_state steps for AMX
  kvm: x86: Disable interception for IA32_XFD on demand
  x86/fpu: Provide fpu_sync_guest_vmexit_xfd_state()
  kvm: selftests: Add support for KVM_CAP_XSAVE2
  kvm: x86: Add support for getting/setting expanded xstate buffer
  x86/fpu: Add uabi_size to guest_fpu
  kvm: x86: Add CPUID support for Intel AMX
  kvm: x86: Add XCR0 support for Intel AMX
  kvm: x86: Disable RDMSR interception of IA32_XFD_ERR
  kvm: x86: Emulate IA32_XFD_ERR for guest
  kvm: x86: Intercept #NM for saving IA32_XFD_ERR
  x86/fpu: Prepare xfd_err in struct fpu_guest
  kvm: x86: Add emulation for IA32_XFD
  x86/fpu: Provide fpu_update_guest_xfd() for IA32_XFD emulation
  kvm: x86: Enable dynamic xfeatures at KVM_SET_CPUID2
  x86/fpu: Provide fpu_enable_guest_xfd_features() for KVM
  x86/fpu: Add guest support to xfd_enable_feature()
  ...

x86/fpu: Fix inline prefix warnings

2022-01-14T18:48:38+00:00

Fix sparse warnings in xstate and remove inline prefix.

Fixes: 980fe2fddcff ("x86/fpu: Extend fpu_xstate_prctl() with guest permissions")
Signed-off-by: Yang Zhong 
Reported-by: kernel test robot 
Message-Id: <20220113180825.322333-1-yang.zhong@intel.com>
Signed-off-by: Paolo Bonzini

x86/fpu: Provide fpu_sync_guest_vmexit_xfd_state()

2022-01-14T18:44:42+00:00

KVM can disable the write emulation for the XFD MSR when the vCPU's fpstate
is already correctly sized to reduce the overhead.

When write emulation is disabled the XFD MSR state after a VMEXIT is
unknown and therefore not in sync with the software states in fpstate and
the per CPU XFD cache.

Provide fpu_sync_guest_vmexit_xfd_state() which has to be invoked after a
VMEXIT before enabling interrupts when write emulation is disabled for the
XFD MSR.

It could be invoked unconditionally even when write emulation is enabled
for the price of a pointless MSR read.

Signed-off-by: Thomas Gleixner 
Signed-off-by: Jing Liu 
Signed-off-by: Yang Zhong 
Message-Id: <20220105123532.12586-21-yang.zhong@intel.com>
Signed-off-by: Paolo Bonzini

x86/fpu: Add uabi_size to guest_fpu

2022-01-14T18:44:40+00:00

Userspace needs to inquire KVM about the buffer size to work
with the new KVM_SET_XSAVE and KVM_GET_XSAVE2. Add the size info
to guest_fpu for KVM to access.

Signed-off-by: Thomas Gleixner 
Signed-off-by: Wei Wang 
Signed-off-by: Jing Liu 
Signed-off-by: Yang Zhong 
Message-Id: <20220105123532.12586-18-yang.zhong@intel.com>
Signed-off-by: Paolo Bonzini

x86/fpu: Prepare xfd_err in struct fpu_guest

2022-01-14T18:44:08+00:00

When XFD causes an instruction to generate #NM, IA32_XFD_ERR
contains information about which disabled state components are
being accessed. The #NM handler is expected to check this
information and then enable the state components by clearing
IA32_XFD for the faulting task (if having permission).

If the XFD_ERR value generated in guest is consumed/clobbered
by the host before the guest itself doing so, it may lead to
non-XFD-related #NM treated as XFD #NM in host (due to non-zero
value in XFD_ERR), or XFD-related #NM treated as non-XFD #NM in
guest (XFD_ERR cleared by the host #NM handler).

Introduce a new field in fpu_guest to save the guest xfd_err value.
KVM is expected to save guest xfd_err before interrupt is enabled
and restore it right before entering the guest (with interrupt
disabled).

Signed-off-by: Jing Liu 
Signed-off-by: Kevin Tian 
Signed-off-by: Jing Liu 
Signed-off-by: Yang Zhong 
Message-Id: <20220105123532.12586-12-yang.zhong@intel.com>
Signed-off-by: Paolo Bonzini

x86/fpu: Provide fpu_update_guest_xfd() for IA32_XFD emulation

2022-01-14T18:43:22+00:00

Guest XFD can be updated either in the emulation path or in the
restore path.

Provide a wrapper to update guest_fpu::fpstate::xfd. If the guest
fpstate is currently in-use, also update the per-cpu xfd cache and
the actual MSR.

Signed-off-by: Kevin Tian 
Signed-off-by: Jing Liu 
Signed-off-by: Yang Zhong 
Message-Id: <20220105123532.12586-10-yang.zhong@intel.com>
Signed-off-by: Paolo Bonzini

x86/fpu: Provide fpu_enable_guest_xfd_features() for KVM

2022-01-14T18:43:21+00:00

Provide a wrapper for expanding the guest fpstate buffer according
to requested xfeatures. KVM wants to call this wrapper to manage
any dynamic xstate used by the guest.

Suggested-by: Sean Christopherson 
Signed-off-by: Sean Christopherson 
Signed-off-by: Kevin Tian 
Signed-off-by: Yang Zhong 
Reviewed-by: Paolo Bonzini 
Message-Id: <20220105123532.12586-8-yang.zhong@intel.com>
[Remove unnecessary 32-bit check. - Paolo]
Signed-off-by: Paolo Bonzini

x86/fpu: Prepare guest FPU for dynamically enabled FPU features

2022-01-07T18:33:03+00:00

To support dynamically enabled FPU features for guests prepare the guest
pseudo FPU container to keep track of the currently enabled xfeatures and
the guest permissions.

Signed-off-by: Thomas Gleixner 
Signed-off-by: Jing Liu 
Signed-off-by: Yang Zhong 
Message-Id: <20220105123532.12586-3-yang.zhong@intel.com>
Signed-off-by: Paolo Bonzini

x86/fpu: Extend fpu_xstate_prctl() with guest permissions

2022-01-07T18:33:03+00:00

KVM requires a clear separation of host user space and guest permissions
for dynamic XSTATE components.

Add a guest permissions member to struct fpu and a separate set of prctl()
arguments: ARCH_GET_XCOMP_GUEST_PERM and ARCH_REQ_XCOMP_GUEST_PERM.

The semantics are equivalent to the host user space permission control
except for the following constraints:

  1) Permissions have to be requested before the first vCPU is created

  2) Permissions are frozen when the first vCPU is created to ensure
     consistency. Any attempt to expand permissions via the prctl() after
     that point is rejected.

Signed-off-by: Thomas Gleixner 
Signed-off-by: Jing Liu 
Signed-off-by: Yang Zhong 
Message-Id: <20220105123532.12586-2-yang.zhong@intel.com>
Signed-off-by: Paolo Bonzini

x86/fpu: Remove duplicate copy_fpstate_to_sigframe() prototype

2021-12-10T18:13:06+00:00

The function prototype of copy_fpstate_to_sigframe() is declared twice in

  0ae67cc34f76 ("x86/fpu: Remove internal.h dependency from fpu/signal.h").

Remove one of them.

 [ bp: Massage ]

Signed-off-by: Shaokun Zhang 
Signed-off-by: Borislav Petkov 
Link: https://lore.kernel.org/r/20211209015550.51916-1-zhangshaokun@hisilicon.com