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Merge tag 'kvm-x86-svm-6.20' of https://github.com/kvm-x86/linux into HEAD

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KVM SVM changes for 6.20

 - Drop a user-triggerable WARN on nested_svm_load_cr3() failure.

 - Add support for virtualizing ERAPS.  Note, correct virtualization of ERAPS
   relies on an upcoming, publicly announced change in the APM to reduce the
   set of conditions where hardware (i.e. KVM) *must* flush the RAP.

 - Ignore nSVM intercepts for instructions that are not supported according to
   L1's virtual CPU model.

 - Add support for expedited writes to the fast MMIO bus, a la VMX's fastpath
   for EPT Misconfig.

 - Don't set GIF when clearing EFER.SVME, as GIF exists independently of SVM,
   and allow userspace to restore nested state with GIF=0.

 - Treat exit_code as an unsigned 64-bit value through all of KVM.

 - Add support for fetching SNP certificates from userspace.

 - Fix a bug where KVM would use vmcb02 instead of vmcb01 when emulating VMLOAD
   or VMSAVE on behalf of L2.

 - Misc fixes and cleanups.
This commit is contained in:
Paolo Bonzini
2026-02-09 18:51:37 +01:00
parent 687603fb2b 20c3c4108d
commit 4215ee0d7b
22 changed files with 559 additions and 156 deletions
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12
arch/x86/kvm/x86.c
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@@ -14143,6 +14143,13 @@ int kvm_handle_invpcid(struct kvm_vcpu *vcpu, unsigned long type, gva_t gva)
return 1;
}
/*
* When ERAPS is supported, invalidating a specific PCID clears
* the RAP (Return Address Predicator).
*/
if (guest_cpu_cap_has(vcpu, X86_FEATURE_ERAPS))
kvm_register_is_dirty(vcpu, VCPU_EXREG_ERAPS);
kvm_invalidate_pcid(vcpu, operand.pcid);
return kvm_skip_emulated_instruction(vcpu);
@@ -14156,6 +14163,11 @@ int kvm_handle_invpcid(struct kvm_vcpu *vcpu, unsigned long type, gva_t gva)
fallthrough;
case INVPCID_TYPE_ALL_INCL_GLOBAL:
/*
* Don't bother marking VCPU_EXREG_ERAPS dirty, SVM will take
* care of doing so when emulating the full guest TLB flush
* (the RAP is cleared on all implicit TLB flushes).
*/
kvm_make_request(KVM_REQ_TLB_FLUSH_GUEST, vcpu);
return kvm_skip_emulated_instruction(vcpu);