KVM: x86: Add helpers to prepare kvm_run for userspace MMIO exit

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Add helpers to fill kvm_run for userspace MMIO exits to deduplicate a
variety of code, and to allow for a cleaner return path in
emulator_read_write().

Opportunistically add a KVM_BUG_ON() to ensure the caller is limiting the
length of a single MMIO access to 8 bytes (the largest size userspace is
prepared to handled, as the ABI was baked before things like MOVDQ came
along).

No functional change intended.

Cc: Rick Edgecombe <rick.p.edgecombe@intel.com>
Cc: Binbin Wu <binbin.wu@linux.intel.com>
Cc: Xiaoyao Li <xiaoyao.li@intel.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Michael Roth <michael.roth@amd.com>
Tested-by: Tom Lendacky <thomas.lendacky@gmail.com>
Tested-by: Rick Edgecombe <rick.p.edgecombe@intel.com>
Link: https://patch.msgid.link/20260225012049.920665-15-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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This commit is contained in:

Sean Christopherson 2026-02-24 17:20:49 -08:00

parent 4f09e62afc

commit e2138c4a5b

3 changed files with 37 additions and 43 deletions

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14

arch/x86/kvm/vmx/tdx.c

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42

arch/x86/kvm/x86.c

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26

arch/x86/kvm/x86.h

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