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[PATCH v1 06/28] x86/hvm: introduce vlapic_reg_read()
- To: xen-devel@xxxxxxxxxxxxxxxxxxxx
- From: dmukhin@xxxxxxxx
- Date: Wed, 4 Nov 2026 17:33:23 -0800
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- Cc: andrew.cooper3@xxxxxxxxxx, jason.andryuk@xxxxxxx, jbeulich@xxxxxxxx, roger@xxxxxxxxxxxxxx, teddy.astie@xxxxxxxxxx, dmukhin@xxxxxxx, Denis Mukhin <dmukhin@xxxxxxxx>
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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From: Denis Mukhin <dmukhin@xxxxxxxx>
Add vlapic_reg_read() for integration with components relying
on emulated LAPIC accesses.
Signed-off-by: Denis Mukhin <dmukhin@xxxxxxxx>
---
xen/arch/x86/hvm/vlapic.c | 5 +++++
xen/arch/x86/include/asm/hvm/vlapic.h | 1 +
2 files changed, 6 insertions(+)
diff --git a/xen/arch/x86/hvm/vlapic.c b/xen/arch/x86/hvm/vlapic.c
index 6698779e227c..f929fdfd74ee 100644
--- a/xen/arch/x86/hvm/vlapic.c
+++ b/xen/arch/x86/hvm/vlapic.c
@@ -618,6 +618,11 @@ static uint32_t vlapic_read_aligned(const struct vlapic
*vlapic,
return 0;
}
+uint32_t vlapic_reg_read(const struct vcpu *v, unsigned int reg)
+{
+ return vlapic_read_aligned(vcpu_vlapic(v), reg);
+}
+
static int cf_check vlapic_mmio_read(
struct vcpu *v, unsigned long address, unsigned int len,
unsigned long *pval)
diff --git a/xen/arch/x86/include/asm/hvm/vlapic.h
b/xen/arch/x86/include/asm/hvm/vlapic.h
index f442dec3d975..95f6dfe9e941 100644
--- a/xen/arch/x86/include/asm/hvm/vlapic.h
+++ b/xen/arch/x86/include/asm/hvm/vlapic.h
@@ -97,6 +97,7 @@ static inline void vlapic_set_reg(
}
void vlapic_reg_write(struct vcpu *v, unsigned int reg, uint32_t val);
+uint32_t vlapic_reg_read(const struct vcpu *v, unsigned int reg);
bool is_vlapic_lvtpc_enabled(struct vlapic *vlapic);
--
2.55.0
|
