[PATCH v14 06/13] KVM: x86: Load guest fpu state when accessing MSRs managed by XSAVES

Yang Weijiang
2020-11-06T01:06:30Z

From: Sean Christopherson <sean.j.christopherson@intel.com>

A handful of CET MSRs are not context switched through "traditional"
methods, e.g. VMCS or manual switching, but rather are passed through
to the guest and are saved and restored by XSAVES/XRSTORS, i.e. in the
guest's FPU state.

Load the guest's FPU state if userspace is accessing MSRs whose values
are managed by XSAVES so that the MSR helper, e.g. vmx_{get,set}_msr(),
can simply do {RD,WR}MSR to access the guest's value.

Because is also used for the KVM_GET_MSRS device ioctl(), explicitly
check that @vcpu is non-null before attempting to load guest state. The
CET MSRs cannot be retrieved via the device ioctl() without loading
guest FPU state (which doesn't exist).

Note that guest_cpuid_has() is not queried as host userspace is allowed
to access MSRs that have not been exposed to the guest, e.g. it might do
KVM_SET_MSRS prior to KVM_SET_CPUID2.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Co-developed-by: Yang Weijiang <weijiang.yang@intel.com>
Signed-off-by: Yang Weijiang <weijiang.yang@intel.com>
---
arch/x86/kvm/x86.c | 19 ++++++++++++++++++-
1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 8c9d631d7842..751b62e871e5 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -109,6 +109,8 @@ static void enter_smm(struct kvm_vcpu *vcpu);
static void __kvm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags);
static void store_regs(struct kvm_vcpu *vcpu);
static int sync_regs(struct kvm_vcpu *vcpu);
+static void kvm_load_guest_fpu(struct kvm_vcpu *vcpu);
+static void kvm_put_guest_fpu(struct kvm_vcpu *vcpu);

struct kvm_x86_ops kvm_x86_ops __read_mostly;
EXPORT_SYMBOL_GPL(kvm_x86_ops);
@@ -3582,6 +3584,12 @@ int kvm_get_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
}
EXPORT_SYMBOL_GPL(kvm_get_msr_common);

+static bool is_xsaves_msr(u32 index)
+{
+ return index == MSR_IA32_U_CET ||
+ (index >= MSR_IA32_PL0_SSP && index <= MSR_IA32_PL3_SSP);
+}
+
/*
* Read or write a bunch of msrs. All parameters are kernel addresses.
*
@@ -3592,11 +3600,20 @@ static int __msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs *msrs,
int (*do_msr)(struct kvm_vcpu *vcpu,
unsigned index, u64 *data))
{
+ bool fpu_loaded = false;
int i;

- for (i = 0; i < msrs->nmsrs; ++i)
+ for (i = 0; i < msrs->nmsrs; ++i) {
+ if (vcpu && !fpu_loaded && supported_xss &&
+ is_xsaves_msr(entries[i].index)) {
+ kvm_load_guest_fpu(vcpu);
+ fpu_loaded = true;
+ }
if (do_msr(vcpu, entries[i].index, &entries[i].data))
break;
+ }
+ if (fpu_loaded)
+ kvm_put_guest_fpu(vcpu);

return i;
}
--
2.17.2