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KVM: x86/hyper-v: Use preallocated per-vCPU buffer for de-sparsified vCPU masks

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Use a preallocated per-vCPU bitmap for tracking the unpacked set of vCPUs
being targeted for Hyper-V's paravirt TLB flushing.  If KVM_MAX_NR_VCPUS
is set to 4096 (which is allowed even for MAXSMP=n builds), putting the
vCPU mask on-stack pushes kvm_hv_flush_tlb() past the default FRAME_WARN
limit.

  arch/x86/kvm/hyperv.c:2001:12: error: stack frame size (1288) exceeds limit (1024)
                                 in 'kvm_hv_flush_tlb' [-Werror,-Wframe-larger-than]
  2001 | static u64 kvm_hv_flush_tlb(struct kvm_vcpu *vcpu, struct kvm_hv_hcall *hc)
       |            ^
  1 error generated.

Note, sparse_banks was given the same treatment by commit 7d5e88d301
("KVM: x86: hyper-v: Use preallocated buffer in 'struct kvm_vcpu_hv'
instead of on-stack 'sparse_banks'"), for the exact same reason.

Reported-by: Abinash Lalotra <abinashsinghlalotra@gmail.com>
Closes: https://lore.kernel.org/all/20250613111023.786265-1-abinashsinghlalotra@gmail.com
Link: https://lore.kernel.org/all/aEylI-O8kFnFHrOH@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Sean Christopherson 2025-06-13 12:39:22 -07:00
parent 48f15f6241
commit 0b6f4a5f08
2 changed files with 7 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
arch/x86/include/asm/kvm_host.h
View File

@ -700,8 +700,13 @@ struct kvm_vcpu_hv {
struct kvm_vcpu_hv_tlb_flush_fifo tlb_flush_fifo[HV_NR_TLB_FLUSH_FIFOS];
/* Preallocated buffer for handling hypercalls passing sparse vCPU set */
/*
* Preallocated buffers for handling hypercalls that pass sparse vCPU
* sets (for high vCPU counts, they're too large to comfortably fit on
* the stack).
*/
u64 sparse_banks[HV_MAX_SPARSE_VCPU_BANKS];
DECLARE_BITMAP(vcpu_mask, KVM_MAX_VCPUS);
struct hv_vp_assist_page vp_assist_page;

2
arch/x86/kvm/hyperv.c
View File

@ -2001,11 +2001,11 @@ int kvm_hv_vcpu_flush_tlb(struct kvm_vcpu *vcpu)
static u64 kvm_hv_flush_tlb(struct kvm_vcpu *vcpu, struct kvm_hv_hcall *hc)
{
struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu);
unsigned long *vcpu_mask = hv_vcpu->vcpu_mask;
u64 *sparse_banks = hv_vcpu->sparse_banks;
struct kvm *kvm = vcpu->kvm;
struct hv_tlb_flush_ex flush_ex;
struct hv_tlb_flush flush;
DECLARE_BITMAP(vcpu_mask, KVM_MAX_VCPUS);
struct kvm_vcpu_hv_tlb_flush_fifo *tlb_flush_fifo;
/*
* Normally, there can be no more than 'KVM_HV_TLB_FLUSH_FIFO_SIZE'