Sean Christopherson 0c29397ac1 KVM: SVM: Disable SEV-ES support if MMIO caching is disable ... Disable SEV-ES if MMIO caching is disabled as SEV-ES relies on MMIO SPTEs generating #NPF(RSVD), which are reflected by the CPU into the guest as a #VC. With SEV-ES, the untrusted host, a.k.a. KVM, doesn't have access to the guest instruction stream or register state and so can't directly emulate in response to a #NPF on an emulated MMIO GPA. Disabling MMIO caching means guest accesses to emulated MMIO ranges cause #NPF(!PRESENT), and those flavors of #NPF cause automatic VM-Exits, not #VC. Adjust KVM's MMIO masks to account for the C-bit location prior to doing SEV(-ES) setup, and document that dependency between adjusting the MMIO SPTE mask and SEV(-ES) setup. Fixes: b09763da4d ("KVM: x86/mmu: Add module param to disable MMIO caching (for testing)") Reported-by: Michael Roth <michael.roth@amd.com> Tested-by: Michael Roth <michael.roth@amd.com> Cc: Tom Lendacky <thomas.lendacky@amd.com> Cc: stable@vger.kernel.org Signed-off-by: Sean Christopherson <seanjc@google.com> Message-Id: <20220803224957.1285926-4-seanjc@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>		2022-08-10 15:08:25 -04:00
..
avic.c	KVM: x86: nSVM: optimize svm_set_x2apic_msr_interception	2022-06-24 12:52:59 -04:00
hyperv.h	KVM: nSVM: Split off common definitions for Hyper-V on KVM and KVM on Hyper-V	2022-02-10 13:50:45 -05:00
nested.c	KVM: x86: Split kvm_is_valid_cr4() and export only the non-vendor bits	2022-07-28 13:22:25 -04:00
pmu.c	Revert "KVM: x86: always allow host-initiated writes to PMU MSRs"	2022-06-20 11:49:46 -04:00
sev.c	KVM: SVM: Disable SEV-ES support if MMIO caching is disable	2022-08-10 15:08:25 -04:00
svm_onhyperv.c	KVM: SVM: Fix kvm_cache_regs.h inclusions for is_guest_mode()	2022-04-02 05:34:40 -04:00
svm_onhyperv.h	KVM: nSVM: Split off common definitions for Hyper-V on KVM and KVM on Hyper-V	2022-02-10 13:50:45 -05:00
svm_ops.h	x86/kvm: Always inline vmload() / vmsave()	2021-09-15 15:51:45 +02:00
svm.c	KVM: SVM: Disable SEV-ES support if MMIO caching is disable	2022-08-10 15:08:25 -04:00
svm.h	Merge remote-tracking branch 'kvm/next' into kvm-next-5.20	2022-08-01 03:21:00 -04:00
vmenter.S	x86: Add magic AMD return-thunk	2022-06-27 10:33:59 +02:00