KVM: x86: Manually check DR4/5 write values to fix SVM intercept priority

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Manually (pre)check the values being written to DR4/5, i.e. the DR6/DR7
aliases, instead of relying on ->set_dr() => kvm_set_dr() to signal a #GP.
SVM unfortunately prioritizes all exceptions over an instruction intercept,
i.e. nSVM is relying on the emulator to perform *all* exception checks
prior to attempting to execute the instruction.

Fixes: 3b88e41a41 ("KVM: SVM: Add intercept check for accessing dr registers")
Reviewed-by: Jim Mattson <jmattson@google.com>
Link: https://patch.msgid.link/20260612230113.684301-4-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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Sean Christopherson 2026-06-12 16:01:08 -07:00

parent 55ac576a9b

commit e27ca3dfbb

1 changed files with 11 additions and 3 deletions

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arch/x86/kvm/emulate.c

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