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[RFC PATCH v6 26/43] altp2m: Add altp2m_set_vcpu_idx

From: Rose Spangler <Rose.Spangler@xxxxxxxxxxxxxx>

Date: Mon, 20 Apr 2026 17:31:49 -0400

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Cc: Rose Spangler <Rose.Spangler@xxxxxxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, "Volodymyr Babchuk" <Volodymyr_Babchuk@xxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, "Andrew Cooper" <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Teddy Astie <teddy.astie@xxxxxxxxxx>

Delivery-date: Mon, 20 Apr 2026 21:33:29 +0000

List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

This commit adds the altp2m_set_vcpu_idx function for both x86 and ARM. Since the altp2m VCPU index is stored differently depending on which architecture is used, the altp2m_set_vcpu_idx function makes it possible to set this value in an architecture independent way for common code routines. This is commit 3/4 of the altp2m_{get,set}_altp2m phase. Signed-off-by: Rose Spangler <Rose.Spangler@xxxxxxxxxxxxxx> --- v6: Introduced this patch. --- xen/arch/arm/include/asm/altp2m.h | 5 +++++ xen/arch/x86/include/asm/altp2m.h | 5 +++++ 2 files changed, 10 insertions(+) diff --git a/xen/arch/arm/include/asm/altp2m.h b/xen/arch/arm/include/asm/altp2m.h index bc695018e62c..f001e022a213 100644 --- a/xen/arch/arm/include/asm/altp2m.h +++ b/xen/arch/arm/include/asm/altp2m.h @@ -29,6 +29,11 @@ static inline uint16_t altp2m_vcpu_idx(const struct vcpu *v) return v->arch.ap2m_idx; } +static inline void altp2m_set_vcpu_idx(struct vcpu *v, unsigned int idx) +{ + v->arch.ap2m_idx = idx; +} + #else /* CONFIG_ALTP2M */ static inline bool altp2m_supported(void) diff --git a/xen/arch/x86/include/asm/altp2m.h b/xen/arch/x86/include/asm/altp2m.h index a1b078783b3e..b3d348386a00 100644 --- a/xen/arch/x86/include/asm/altp2m.h +++ b/xen/arch/x86/include/asm/altp2m.h @@ -60,6 +60,11 @@ static inline uint16_t altp2m_vcpu_idx(const struct vcpu *v) return vcpu_altp2m(v).p2midx; } +static inline void altp2m_set_vcpu_idx(struct vcpu *v, unsigned int idx) +{ + vcpu_altp2m(v).p2midx = idx; +} + /* * Alternate p2m: shadow p2m tables used for alternate memory views */ -- 2.34.1

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