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Message-Id: <20210712060934.617562085@linuxfoundation.org>
Date: Mon, 12 Jul 2021 08:02:33 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Xiaoyao Li <xiaoyao.li@...el.com>,
Sean Christopherson <seanjc@...gle.com>,
Paolo Bonzini <pbonzini@...hat.com>
Subject: [PATCH 5.12 070/700] KVM: nVMX: Handle split-lock #AC exceptions that happen in L2
From: Sean Christopherson <seanjc@...gle.com>
commit b33bb78a1fada6445c265c585ee0dd0fc6279102 upstream.
Mark #ACs that won't be reinjected to the guest as wanted by L0 so that
KVM handles split-lock #AC from L2 instead of forwarding the exception to
L1. Split-lock #AC isn't yet virtualized, i.e. L1 will treat it like a
regular #AC and do the wrong thing, e.g. reinject it into L2.
Fixes: e6f8b6c12f03 ("KVM: VMX: Extend VMXs #AC interceptor to handle split lock #AC in guest")
Cc: Xiaoyao Li <xiaoyao.li@...el.com>
Signed-off-by: Sean Christopherson <seanjc@...gle.com>
Message-Id: <20210622172244.3561540-1-seanjc@...gle.com>
Cc: stable@...r.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
arch/x86/kvm/vmx/nested.c | 3 +++
arch/x86/kvm/vmx/vmcs.h | 5 +++++
arch/x86/kvm/vmx/vmx.c | 4 ++--
arch/x86/kvm/vmx/vmx.h | 1 +
4 files changed, 11 insertions(+), 2 deletions(-)
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -5775,6 +5775,9 @@ static bool nested_vmx_l0_wants_exit(str
else if (is_breakpoint(intr_info) &&
vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP)
return true;
+ else if (is_alignment_check(intr_info) &&
+ !vmx_guest_inject_ac(vcpu))
+ return true;
return false;
case EXIT_REASON_EXTERNAL_INTERRUPT:
return true;
--- a/arch/x86/kvm/vmx/vmcs.h
+++ b/arch/x86/kvm/vmx/vmcs.h
@@ -117,6 +117,11 @@ static inline bool is_gp_fault(u32 intr_
return is_exception_n(intr_info, GP_VECTOR);
}
+static inline bool is_alignment_check(u32 intr_info)
+{
+ return is_exception_n(intr_info, AC_VECTOR);
+}
+
static inline bool is_machine_check(u32 intr_info)
{
return is_exception_n(intr_info, MC_VECTOR);
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -4796,7 +4796,7 @@ static int handle_machine_check(struct k
* - Guest has #AC detection enabled in CR0
* - Guest EFLAGS has AC bit set
*/
-static inline bool guest_inject_ac(struct kvm_vcpu *vcpu)
+bool vmx_guest_inject_ac(struct kvm_vcpu *vcpu)
{
if (!boot_cpu_has(X86_FEATURE_SPLIT_LOCK_DETECT))
return true;
@@ -4905,7 +4905,7 @@ static int handle_exception_nmi(struct k
kvm_run->debug.arch.exception = ex_no;
break;
case AC_VECTOR:
- if (guest_inject_ac(vcpu)) {
+ if (vmx_guest_inject_ac(vcpu)) {
kvm_queue_exception_e(vcpu, AC_VECTOR, error_code);
return 1;
}
--- a/arch/x86/kvm/vmx/vmx.h
+++ b/arch/x86/kvm/vmx/vmx.h
@@ -379,6 +379,7 @@ void vmx_set_segment(struct kvm_vcpu *vc
u64 construct_eptp(struct kvm_vcpu *vcpu, unsigned long root_hpa,
int root_level);
+bool vmx_guest_inject_ac(struct kvm_vcpu *vcpu);
void vmx_update_exception_bitmap(struct kvm_vcpu *vcpu);
void vmx_update_msr_bitmap(struct kvm_vcpu *vcpu);
bool vmx_nmi_blocked(struct kvm_vcpu *vcpu);
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