Merge tag 'kvm-x86-fixes-6.9-rcN' of https://github.com/kvm-x86/linux into HEAD

- Fix a mostly benign bug in the gfn_to_pfn_cache infrastructure where KVM
  would allow userspace to refresh the cache with a bogus GPA.  The bug has
  existed for quite some time, but was exposed by a new sanity check added in
  6.9 (to ensure a cache is either GPA-based or HVA-based).

- Drop an unused param from gfn_to_pfn_cache_invalidate_start() that got left
  behind during a 6.9 cleanup.

- Disable support for virtualizing adaptive PEBS, as KVM's implementation is
  architecturally broken and can leak host LBRs to the guest.

- Fix a bug where KVM neglects to set the enable bits for general purpose
  counters in PERF_GLOBAL_CTRL when initializing the virtual PMU.  Both Intel
  and AMD architectures require the bits to be set at RESET in order for v2
  PMUs to be backwards compatible with software that was written for v1 PMUs,
  i.e. for software that will never manually set the global enables.

- Disable LBR virtualization on CPUs that don't support LBR callstacks, as
  KVM unconditionally uses PERF_SAMPLE_BRANCH_CALL_STACK when creating the
  virtual LBR perf event, i.e. KVM will always fail to create LBR events on
  such CPUs.

- Fix a math goof in x86's hugepage logic for KVM_SET_MEMORY_ATTRIBUTES that
  results in an array overflow (detected by KASAN).

- Fix a flaw in the max_guest_memory selftest that results in it exhausting
  the supply of ucall structures when run with more than 256 vCPUs.

- Mark KVM_MEM_READONLY as supported for RISC-V in set_memory_region_test.

- Fix a bug where KVM incorrectly thinks a TDP MMU root is an indirect shadow
  root due KVM unnecessarily clobbering root_role.direct when userspace sets
  guest CPUID.

- Fix a dirty logging bug in the where KVM fails to write-protect TDP MMU
  SPTEs used for L2 if Page-Modification Logging is enabled for L1 and the L1
  hypervisor is NOT using EPT (if nEPT is enabled, KVM doesn't use the TDP MMU
  to run L2).  For simplicity, KVM always disables PML when running L2, but
  the TDP MMU wasn't accounting for root-specific conditions that force write-
  protect based dirty logging.

1 files changed, 1 insertions, 0 deletions

diff --git a/arch/x86/include/asm/perf_event.h b/arch/x86/include/asm/perf_event.h
index 3736b8a46c04..7f1e17250546 100644
--- a/arch/x86/include/asm/perf_event.h
+++ b/arch/x86/include/asm/perf_event.h
@@ -555,6 +555,7 @@ struct x86_pmu_lbr {
 	unsigned int	from;
 	unsigned int	to;
 	unsigned int	info;
+	bool		has_callstack;
 };
 
 extern void perf_get_x86_pmu_capability(struct x86_pmu_capability *cap);