[PATCH 5.12 006/363] KVM: SVM: Make sure GHCB is mapped before updating

From: Greg Kroah-Hartman
Date: Mon May 17 2021 - 10:07:25 EST

From: Tom Lendacky <thomas.lendacky@xxxxxxx>

commit a3ba26ecfb569f4aa3f867e80c02aa65f20aadad upstream.

Access to the GHCB is mainly in the VMGEXIT path and it is known that the
GHCB will be mapped. But there are two paths where it is possible the GHCB
might not be mapped.

The sev_vcpu_deliver_sipi_vector() routine will update the GHCB to inform
the caller of the AP Reset Hold NAE event that a SIPI has been delivered.
However, if a SIPI is performed without a corresponding AP Reset Hold,
then the GHCB might not be mapped (depending on the previous VMEXIT),
which will result in a NULL pointer dereference.

The svm_complete_emulated_msr() routine will update the GHCB to inform
the caller of a RDMSR/WRMSR operation about any errors. While it is likely
that the GHCB will be mapped in this situation, add a safe guard
in this path to be certain a NULL pointer dereference is not encountered.

Fixes: f1c6366e3043 ("KVM: SVM: Add required changes to support intercepts under SEV-ES")
Fixes: 647daca25d24 ("KVM: SVM: Add support for booting APs in an SEV-ES guest")
Signed-off-by: Tom Lendacky <thomas.lendacky@xxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Message-Id: <a5d3ebb600a91170fc88599d5a575452b3e31036.1617979121.git.thomas.lendacky@xxxxxxx>
Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
arch/x86/kvm/svm/sev.c | 3 +++
arch/x86/kvm/svm/svm.c | 2 +-
2 files changed, 4 insertions(+), 1 deletion(-)

--- a/arch/x86/kvm/svm/sev.c
+++ b/arch/x86/kvm/svm/sev.c
@@ -2106,5 +2106,8 @@ void sev_vcpu_deliver_sipi_vector(struct
* the guest will set the CS and RIP. Set SW_EXIT_INFO_2 to a
* non-zero value.
+ if (!svm->ghcb)
+ return;
ghcb_set_sw_exit_info_2(svm->ghcb, 1);
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -2811,7 +2811,7 @@ static int svm_get_msr(struct kvm_vcpu *
static int svm_complete_emulated_msr(struct kvm_vcpu *vcpu, int err)
struct vcpu_svm *svm = to_svm(vcpu);
- if (!sev_es_guest(svm->vcpu.kvm) || !err)
+ if (!err || !sev_es_guest(vcpu->kvm) || WARN_ON_ONCE(!svm->ghcb))
return kvm_complete_insn_gp(&svm->vcpu, err);

ghcb_set_sw_exit_info_1(svm->ghcb, 1);