From: Sean Christopherson <sean.j.christopherson@intel.com>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: Sean Christopherson <sean.j.christopherson@intel.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,
Derek Yerger <derek@djy.llc>,
kernel@najdan.com, Thomas Lambertz <mail@thomaslambertz.de>,
Rik van Riel <riel@surriel.com>,
Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
Borislav Petkov <bp@suse.de>, Dave Hansen <dave.hansen@intel.com>,
Thomas Gleixner <tglx@linutronix.de>
Subject: [PATCH v2 1/4] KVM: x86: Handle TIF_NEED_FPU_LOAD in kvm_{load,put}_guest_fpu()
Date: Fri, 17 Jan 2020 11:30:49 -0800 [thread overview]
Message-ID: <20200117193052.1339-2-sean.j.christopherson@intel.com> (raw)
In-Reply-To: <20200117193052.1339-1-sean.j.christopherson@intel.com>
Handle TIF_NEED_FPU_LOAD similar to how fpu__copy() handles the flag
when duplicating FPU state to a new task struct. TIF_NEED_FPU_LOAD can
be set any time control is transferred out of KVM, be it voluntarily,
e.g. if I/O is triggered during a KVM call to get_user_pages, or
involuntarily, e.g. if softirq runs after an IRQ occurs. Therefore,
KVM must account for TIF_NEED_FPU_LOAD whenever it is (potentially)
accessing CPU FPU state.
Fixes: 5f409e20b7945 ("x86/fpu: Defer FPU state load until return to userspace")
Cc: stable@vger.kernel.org
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
arch/x86/kvm/x86.c | 19 +++++++++++++++++--
1 file changed, 17 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index cf917139de6b..0bbf0110bef7 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -8471,12 +8471,26 @@ static int complete_emulated_mmio(struct kvm_vcpu *vcpu)
return 0;
}
+static void kvm_save_current_fpu(struct fpu *fpu)
+{
+ /*
+ * If the target FPU state is not resident in the CPU registers, just
+ * memcpy() from current, else save CPU state directly to the target.
+ */
+ if (test_thread_flag(TIF_NEED_FPU_LOAD))
+ memcpy(&fpu->state, ¤t->thread.fpu.state,
+ fpu_kernel_xstate_size);
+ else
+ copy_fpregs_to_fpstate(fpu);
+}
+
/* Swap (qemu) user FPU context for the guest FPU context. */
static void kvm_load_guest_fpu(struct kvm_vcpu *vcpu)
{
fpregs_lock();
- copy_fpregs_to_fpstate(vcpu->arch.user_fpu);
+ kvm_save_current_fpu(vcpu->arch.user_fpu);
+
/* PKRU is separately restored in kvm_x86_ops->run. */
__copy_kernel_to_fpregs(&vcpu->arch.guest_fpu->state,
~XFEATURE_MASK_PKRU);
@@ -8492,7 +8506,8 @@ static void kvm_put_guest_fpu(struct kvm_vcpu *vcpu)
{
fpregs_lock();
- copy_fpregs_to_fpstate(vcpu->arch.guest_fpu);
+ kvm_save_current_fpu(vcpu->arch.guest_fpu);
+
copy_kernel_to_fpregs(&vcpu->arch.user_fpu->state);
fpregs_mark_activate();
--
2.24.1
next prev parent reply other threads:[~2020-01-17 19:34 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-17 19:30 [PATCH v2 0/4] KVM: x86: TIF_NEED_FPU_LOAD bug fixes Sean Christopherson
2020-01-17 19:30 ` Sean Christopherson [this message]
2020-01-17 19:30 ` [PATCH v2 2/4] KVM: x86: Ensure guest's FPU state is loaded when accessing for emulation Sean Christopherson
2020-01-17 19:30 ` [PATCH v2 3/4] KVM: x86: Revert "KVM: X86: Fix fpu state crash in kvm guest" Sean Christopherson
2020-01-17 19:30 ` [PATCH v2 4/4] KVM: x86: Remove unused ctxt param from emulator's FPU accessors Sean Christopherson
2020-01-18 21:35 ` Paolo Bonzini
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