KVM x86 emulated MMIO changes for 7.1

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Copy single-chunk MMIO write values into a persistent (per-fragment) field to
 fix use-after-free stack bugs due to KVM dereferencing a stack pointer after an
 exit to userspace.
 
 Clean up and comment the emulated MMIO code to try to make it easier to
 maintain (not necessarily "easy", but "easier").
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Merge tag 'kvm-x86-mmio-7.1' of https://github.com/kvm-x86/linux into HEAD

KVM x86 emulated MMIO changes for 7.1

Copy single-chunk MMIO write values into a persistent (per-fragment) field to
fix use-after-free stack bugs due to KVM dereferencing a stack pointer after an
exit to userspace.

Clean up and comment the emulated MMIO code to try to make it easier to
maintain (not necessarily "easy", but "easier").

...

This commit is contained in:

Paolo Bonzini 2026-04-13 12:49:14 +02:00

parent c13008ed3d e2138c4a5b

commit aa856775be

7 changed files with 179 additions and 191 deletions

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3

arch/x86/include/asm/kvm_host.h

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13

arch/x86/kvm/emulate.c

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22

arch/x86/kvm/svm/sev.c

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14

arch/x86/kvm/vmx/tdx.c

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295

arch/x86/kvm/x86.c

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32

arch/x86/kvm/x86.h

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3

include/linux/kvm_host.h

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