KVM: x86: Assume a 64-bit hypercall for guests with protected state

commit b5aead0064f33ae5e693a364e3204fe1c0ac9af2 upstream.

When processing a hypercall for a guest with protected state, currently
SEV-ES guests, the guest CS segment register can't be checked to
determine if the guest is in 64-bit mode. For an SEV-ES guest, it is
expected that communication between the guest and the hypervisor is
performed to shared memory using the GHCB. In order to use the GHCB, the
guest must have been in long mode, otherwise writes by the guest to the
GHCB would be encrypted and not be able to be comprehended by the
hypervisor.

Create a new helper function, is_64_bit_hypercall(), that assumes the
guest is in 64-bit mode when the guest has protected state, and returns
true, otherwise invoking is_64_bit_mode() to determine the mode. Update
the hypercall related routines to use is_64_bit_hypercall() instead of
is_64_bit_mode().

Add a WARN_ON_ONCE() to is_64_bit_mode() to catch occurences of calls to
this helper function for a guest running with protected state.

Fixes: f1c6366e3043 ("KVM: SVM: Add required changes to support intercepts under SEV-ES")
Reported-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Message-Id: <e0b20c770c9d0d1403f23d83e785385104211f74.1621878537.git.thomas.lendacky@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c
index d5124b5..b9a13dc 100644 (file)
--- a/arch/x86/kvm/hyperv.c
+++ b/arch/x86/kvm/hyperv.c
@@ -2022,7 +2022,7 @@ static void kvm_hv_hypercall_set_result(struct kvm_vcpu *vcpu, u64 result)
 {
        bool longmode;
 
-       longmode = is_64_bit_mode(vcpu);
+       longmode = is_64_bit_hypercall(vcpu);
        if (longmode)
                kvm_rax_write(vcpu, result);
        else {
@@ -2171,7 +2171,7 @@ int kvm_hv_hypercall(struct kvm_vcpu *vcpu)
        }
 
 #ifdef CONFIG_X86_64
-       if (is_64_bit_mode(vcpu)) {
+       if (is_64_bit_hypercall(vcpu)) {
                hc.param = kvm_rcx_read(vcpu);
                hc.ingpa = kvm_rdx_read(vcpu);
                hc.outgpa = kvm_r8_read(vcpu);

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index c48e2b5..66e4e9a 100644 (file)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -8737,7 +8737,7 @@ int kvm_emulate_hypercall(struct kvm_vcpu *vcpu)
 
        trace_kvm_hypercall(nr, a0, a1, a2, a3);
 
-       op_64_bit = is_64_bit_mode(vcpu);
+       op_64_bit = is_64_bit_hypercall(vcpu);
        if (!op_64_bit) {
                nr &= 0xFFFFFFFF;
                a0 &= 0xFFFFFFFF;

diff --git a/arch/x86/kvm/x86.h b/arch/x86/kvm/x86.h
index 7d66d63..9776a1d 100644 (file)
--- a/arch/x86/kvm/x86.h
+++ b/arch/x86/kvm/x86.h
@@ -153,12 +153,24 @@ static inline bool is_64_bit_mode(struct kvm_vcpu *vcpu)
 {
        int cs_db, cs_l;
 
+       WARN_ON_ONCE(vcpu->arch.guest_state_protected);
+
        if (!is_long_mode(vcpu))
                return false;
        static_call(kvm_x86_get_cs_db_l_bits)(vcpu, &cs_db, &cs_l);
        return cs_l;
 }
 
+static inline bool is_64_bit_hypercall(struct kvm_vcpu *vcpu)
+{
+       /*
+        * If running with protected guest state, the CS register is not
+        * accessible. The hypercall register values will have had to been
+        * provided in 64-bit mode, so assume the guest is in 64-bit.
+        */
+       return vcpu->arch.guest_state_protected || is_64_bit_mode(vcpu);
+}
+
 static inline bool x86_exception_has_error_code(unsigned int vector)
 {
        static u32 exception_has_error_code = BIT(DF_VECTOR) | BIT(TS_VECTOR) |

diff --git a/arch/x86/kvm/xen.c b/arch/x86/kvm/xen.c
index 8f62bae..4329b67 100644 (file)
--- a/arch/x86/kvm/xen.c
+++ b/arch/x86/kvm/xen.c
@@ -698,7 +698,7 @@ int kvm_xen_hypercall(struct kvm_vcpu *vcpu)
            kvm_hv_hypercall_enabled(vcpu))
                return kvm_hv_hypercall(vcpu);
 
-       longmode = is_64_bit_mode(vcpu);
+       longmode = is_64_bit_hypercall(vcpu);
        if (!longmode) {
                params[0] = (u32)kvm_rbx_read(vcpu);
                params[1] = (u32)kvm_rcx_read(vcpu);