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Re: [PATCH v1] x86/svm: Fix VMLOAD/VMSAVE state handling when using nested virt
- To: Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 21 Sep 2026 13:21:10 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger@xxxxxxxxxxxxxx>, Jason Andryuk <jason.andryuk@xxxxxxx>, Teddy Astie <teddy.astie@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Mon, 21 Sep 2026 11:21:23 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 11.09.2026 17:12, Ross Lagerwall wrote:
> --- a/xen/arch/x86/hvm/svm/svm.c
> +++ b/xen/arch/x86/hvm/svm/svm.c
> @@ -444,30 +444,30 @@ static int svm_vmcb_restore(struct vcpu *v, struct
> hvm_hw_cpu *c)
>
> static void svm_save_cpu_state(struct vcpu *v, struct hvm_hw_cpu *data)
> {
> - struct vmcb_struct *vmcb = v->arch.hvm.svm.vmcb;
> + struct vmcb_struct *n1_vmcb = vcpu_nestedhvm(v).nv_n1vmcx;
Here and elsewhere you assume that vcpu_nestedhvm() is legitimate to use
even in the non-nested case. I think that's heading in the wrong direction;
I think that a hypothetical mode with CONFIG_NESTED=n and the entire
struct nestedvcpu wrapped in #ifdef CONFIG_NESTED should still be possible
to put in place, without meaningful rearrangements or renaming besides the
adding of the respective #if{,n}def.
Jan
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