6d0386ea99
Move KVM's morphing of pending signals into userspace exits into KVM proper, and drop the @vcpu param from xfer_to_guest_mode_handle_work(). How KVM responds to -EINTR is a detail that really belongs in KVM itself, and invoking kvm_handle_signal_exit() from kernel code creates an inverted module dependency. E.g. attempting to move kvm_handle_signal_exit() into kvm_main.c would generate an linker error when building kvm.ko as a module. Dropping KVM details will also converting the KVM "entry" code into a more generic virtualization framework so that it can be used when running as a Hyper-V root partition. Lastly, eliminating usage of "struct kvm_vcpu" outside of KVM is also nice to have for KVM x86 developers, as keeping the details of kvm_vcpu purely within KVM allows changing the layout of the structure without having to boot into a new kernel, e.g. allows rebuilding and reloading kvm.ko with a modified kvm_vcpu structure as part of debug/development. Signed-off-by: Sean Christopherson <seanjc@google.com> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Wei Liu <wei.liu@kernel.org>
47 lines
1.0 KiB
C
47 lines
1.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/entry-kvm.h>
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static int xfer_to_guest_mode_work(unsigned long ti_work)
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{
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do {
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int ret;
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if (ti_work & (_TIF_SIGPENDING | _TIF_NOTIFY_SIGNAL))
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return -EINTR;
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if (ti_work & (_TIF_NEED_RESCHED | _TIF_NEED_RESCHED_LAZY))
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schedule();
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if (ti_work & _TIF_NOTIFY_RESUME)
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resume_user_mode_work(NULL);
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ret = arch_xfer_to_guest_mode_handle_work(ti_work);
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if (ret)
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return ret;
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ti_work = read_thread_flags();
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} while (ti_work & XFER_TO_GUEST_MODE_WORK);
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return 0;
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}
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int xfer_to_guest_mode_handle_work(void)
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{
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unsigned long ti_work;
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/*
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* This is invoked from the outer guest loop with interrupts and
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* preemption enabled.
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*
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* KVM invokes xfer_to_guest_mode_work_pending() with interrupts
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* disabled in the inner loop before going into guest mode. No need
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* to disable interrupts here.
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*/
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ti_work = read_thread_flags();
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if (!(ti_work & XFER_TO_GUEST_MODE_WORK))
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return 0;
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return xfer_to_guest_mode_work(ti_work);
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}
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EXPORT_SYMBOL_GPL(xfer_to_guest_mode_handle_work);
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