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xen: rework xen_pv_domain()

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Rework xen_pv_domain() to no longer use the xen_domain_type variable,
but the artificial X86_FEATURE_XENPV cpu feature.

On non-x86 architectures xen_pv_domain() can be defined as "0".

This has the advantage that a kernel not built with CONFIG_XEN_PV
will be smaller due to dead code elimination.

Set the X86_FEATURE_XENPV feature very early, as xen_pv_domain() is
used rather early, too.

Reviewed-by: Jason Andryuk <jason.andryuk@amd.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
Message-ID: <20250826145608.10352-2-jgross@suse.com>
This commit is contained in:
Juergen Gross
2025-08-26 16:56:06 +02:00
parent 76eeb9b8de
commit 34c605fe53
2 changed files with 9 additions and 2 deletions
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2
arch/x86/xen/enlighten_pv.c
View File

@@ -382,7 +382,6 @@ static bool __init xen_check_xsave(void)
static void __init xen_init_capabilities(void)
{
setup_force_cpu_cap(X86_FEATURE_XENPV);
setup_clear_cpu_cap(X86_FEATURE_DCA);
setup_clear_cpu_cap(X86_FEATURE_APERFMPERF);
setup_clear_cpu_cap(X86_FEATURE_MTRR);
@@ -1402,6 +1401,7 @@ asmlinkage __visible void __init xen_start_kernel(struct start_info *si)
JMP32_INSN_SIZE);
xen_domain_type = XEN_PV_DOMAIN;
setup_force_cpu_cap(X86_FEATURE_XENPV);
xen_start_flags = xen_start_info->flags;
/* Interrupts are guaranteed to be off initially. */
early_boot_irqs_disabled = true;

9
include/xen/xen.h
View File

@@ -22,8 +22,15 @@ extern bool xen_pvh;
#define xen_pvh 0
#endif
#ifdef CONFIG_X86
#include <asm/cpufeature.h>
#define xen_pv_domain() (cpu_feature_enabled(X86_FEATURE_XENPV))
#else
#define xen_pv_domain() 0
#endif
#define xen_domain() (xen_domain_type != XEN_NATIVE)
#define xen_pv_domain() (xen_domain_type == XEN_PV_DOMAIN)
#define xen_hvm_domain() (xen_domain_type == XEN_HVM_DOMAIN)
#define xen_pvh_domain() (xen_pvh)