From: Sean Christopherson <seanjc@google.com>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: Sean Christopherson <seanjc@google.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Wanpeng Li <wanpengli@tencent.com>,
Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
Babu Moger <babu.moger@amd.com>,
Joao Martins <joao.m.martins@oracle.com>,
David Woodhouse <dwmw@amazon.co.uk>
Subject: [PATCH v2 3/9] KVM: SVM: Truncate GPR value for DR and CR accesses in !64-bit mode
Date: Wed, 21 Apr 2021 19:21:22 -0700 [thread overview]
Message-ID: <20210422022128.3464144-4-seanjc@google.com> (raw)
In-Reply-To: <20210422022128.3464144-1-seanjc@google.com>
Drop bits 63:32 on loads/stores to/from DRs and CRs when the vCPU is not
in 64-bit mode. The APM states bits 63:32 are dropped for both DRs and
CRs:
In 64-bit mode, the operand size is fixed at 64 bits without the need
for a REX prefix. In non-64-bit mode, the operand size is fixed at 32
bits and the upper 32 bits of the destination are forced to 0.
Fixes: 7ff76d58a9dc ("KVM: SVM: enhance MOV CR intercept handler")
Fixes: cae3797a4639 ("KVM: SVM: enhance mov DR intercept handler")
Cc: stable@vger.kernel.org
Signed-off-by: Sean Christopherson <seanjc@google.com>
---
arch/x86/kvm/svm/svm.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index cd8c333ed2dc..6df12d7967db 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -2462,7 +2462,7 @@ static int cr_interception(struct kvm_vcpu *vcpu)
err = 0;
if (cr >= 16) { /* mov to cr */
cr -= 16;
- val = kvm_register_read(vcpu, reg);
+ val = kvm_register_readl(vcpu, reg);
trace_kvm_cr_write(cr, val);
switch (cr) {
case 0:
@@ -2508,7 +2508,7 @@ static int cr_interception(struct kvm_vcpu *vcpu)
kvm_queue_exception(vcpu, UD_VECTOR);
return 1;
}
- kvm_register_write(vcpu, reg, val);
+ kvm_register_writel(vcpu, reg, val);
trace_kvm_cr_read(cr, val);
}
return kvm_complete_insn_gp(vcpu, err);
@@ -2574,11 +2574,11 @@ static int dr_interception(struct kvm_vcpu *vcpu)
dr = svm->vmcb->control.exit_code - SVM_EXIT_READ_DR0;
if (dr >= 16) { /* mov to DRn */
dr -= 16;
- val = kvm_register_read(vcpu, reg);
+ val = kvm_register_readl(vcpu, reg);
err = kvm_set_dr(vcpu, dr, val);
} else {
kvm_get_dr(vcpu, dr, &val);
- kvm_register_write(vcpu, reg, val);
+ kvm_register_writel(vcpu, reg, val);
}
return kvm_complete_insn_gp(vcpu, err);
--
2.31.1.498.g6c1eba8ee3d-goog
next prev parent reply other threads:[~2021-04-22 2:21 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-22 2:21 [PATCH v2 0/9] KVM: x86: Fixes for (benign?) truncation bugs Sean Christopherson
2021-04-22 2:21 ` [PATCH v2 1/9] KVM: x86: Remove emulator's broken checks on CR0/CR3/CR4 loads Sean Christopherson
2021-04-22 6:50 ` Paolo Bonzini
2021-04-22 2:21 ` [PATCH v2 2/9] KVM: x86: Check CR3 GPA for validity regardless of vCPU mode Sean Christopherson
2021-04-22 6:51 ` Paolo Bonzini
2021-04-22 16:55 ` Sean Christopherson
2021-04-22 2:21 ` Sean Christopherson [this message]
2021-04-22 2:21 ` [PATCH v2 4/9] KVM: VMX: Truncate GPR value for DR and CR reads in !64-bit mode Sean Christopherson
2021-04-22 2:21 ` [PATCH v2 5/9] KVM: nVMX: Truncate bits 63:32 of VMCS field on nested check in !64-bit Sean Christopherson
2021-04-22 2:21 ` [PATCH v2 6/9] KVM: nVMX: Truncate base/index GPR value on address calc " Sean Christopherson
2021-04-22 2:21 ` [PATCH v2 7/9] KVM: x86/xen: Drop RAX[63:32] when processing hypercall Sean Christopherson
2021-04-22 9:51 ` Vitaly Kuznetsov
2021-04-22 10:35 ` Paolo Bonzini
2021-04-22 10:49 ` Vitaly Kuznetsov
2021-04-22 2:21 ` [PATCH v2 8/9] KVM: SVM: Use default rAX size for INVLPGA emulation Sean Christopherson
2021-04-22 2:21 ` [PATCH v2 9/9] KVM: x86: Rename GPR accessors to make mode-aware variants the defaults Sean Christopherson
2021-04-22 6:55 ` [PATCH v2 0/9] KVM: x86: Fixes for (benign?) truncation bugs Paolo Bonzini
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