[v1,1/3] xen/domain: introduce non-x86 hardware emulation flags

Commit Message

Denis Mukhin April 1, 2025, 12:52 a.m. UTC

From: Denis Mukhin <[e-mail]>

Define per-architecture emulation_flags for configuring in-hypervisor
emulators.

Print d->arch.emulation_flags from 'q' keyhandler for better traceability
while debugging in-hypervisor hardware emulators.

Simplify the x86's emulation_flags description and make it consistent
with newly introduced non-x86 descriptions.

Signed-off-by: Denis Mukhin <[e-mail]>
---
 xen/arch/arm/include/asm/domain.h   | 2 ++
 xen/arch/ppc/include/asm/domain.h   | 2 ++
 xen/arch/riscv/include/asm/domain.h | 2 ++
 xen/arch/x86/include/asm/domain.h   | 2 +-
 xen/common/keyhandler.c             | 1 +
 5 files changed, 8 insertions(+), 1 deletion(-)

Patch

diff --git a/xen/arch/arm/include/asm/domain.h b/xen/arch/arm/include/asm/domain.h
index 50b6a4b009..279ff64fe0 100644
--- a/xen/arch/arm/include/asm/domain.h
+++ b/xen/arch/arm/include/asm/domain.h
@@ -119,6 +119,8 @@  struct arch_domain
     void *tee;
 #endif
 
+    /* Hardware emulation flags. */
+    uint32_t emulation_flags;
 }  __cacheline_aligned;
 
 struct arch_vcpu
diff --git a/xen/arch/ppc/include/asm/domain.h b/xen/arch/ppc/include/asm/domain.h
index 3a447272c6..8aa7b4a6ac 100644
--- a/xen/arch/ppc/include/asm/domain.h
+++ b/xen/arch/ppc/include/asm/domain.h
@@ -21,6 +21,8 @@  struct arch_vcpu {
 
 struct arch_domain {
     struct hvm_domain hvm;
+    /* Hardware emulation flags. */
+    uint32_t emulation_flags;
 };
 
 #include <xen/sched.h>
diff --git a/xen/arch/riscv/include/asm/domain.h b/xen/arch/riscv/include/asm/domain.h
index c3d965a559..b561e6f4f8 100644
--- a/xen/arch/riscv/include/asm/domain.h
+++ b/xen/arch/riscv/include/asm/domain.h
@@ -18,6 +18,8 @@  struct arch_vcpu {
 
 struct arch_domain {
     struct hvm_domain hvm;
+    /* Hardware emulation flags. */
+    uint32_t emulation_flags;
 };
 
 #include <xen/sched.h>
diff --git a/xen/arch/x86/include/asm/domain.h b/xen/arch/x86/include/asm/domain.h
index 5fc1d1e5d0..6b877e33a1 100644
--- a/xen/arch/x86/include/asm/domain.h
+++ b/xen/arch/x86/include/asm/domain.h
@@ -456,7 +456,7 @@  struct arch_domain
     /* Don't unconditionally inject #GP for unhandled MSRs. */
     bool msr_relaxed;
 
-    /* Emulated devices enabled bitmap. */
+    /* Hardware emulation flags. */
     uint32_t emulation_flags;
 } __cacheline_aligned;
 
diff --git a/xen/common/keyhandler.c b/xen/common/keyhandler.c
index 0bb842ec00..73f5134b68 100644
--- a/xen/common/keyhandler.c
+++ b/xen/common/keyhandler.c
@@ -306,6 +306,7 @@  static void cf_check dump_domains(unsigned char key)
             if ( test_bit(i, &d->watchdog_inuse_map) )
                 printk("    watchdog %d expires in %d seconds\n",
                        i, (u32)((d->watchdog_timer[i].expires - NOW()) >> 30));
+        printk("    emulation_flags %#x\n", d->arch.emulation_flags);
 
         arch_dump_domain_info(d);