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entry/kvm: KVM: Move KVM details related to signal/-EINTR into KVM proper

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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>
This commit is contained in:
Sean Christopherson
2025-08-27 17:01:53 -07:00
committed by Wei Liu
parent 0ebac01a00
commit 6d0386ea99
8 changed files with 24 additions and 26 deletions
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13
include/linux/kvm_host.h
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@@ -2,7 +2,7 @@
#ifndef __KVM_HOST_H
#define __KVM_HOST_H
#include <linux/entry-kvm.h>
#include <linux/types.h>
#include <linux/hardirq.h>
#include <linux/list.h>
@@ -2450,6 +2450,17 @@ static inline void kvm_handle_signal_exit(struct kvm_vcpu *vcpu)
vcpu->run->exit_reason = KVM_EXIT_INTR;
vcpu->stat.signal_exits++;
}
static inline int kvm_xfer_to_guest_mode_handle_work(struct kvm_vcpu *vcpu)
{
int r = xfer_to_guest_mode_handle_work();
if (r) {
WARN_ON_ONCE(r != -EINTR);
kvm_handle_signal_exit(vcpu);
}
return r;
}
#endif /* CONFIG_KVM_XFER_TO_GUEST_WORK */
/*