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Thu, 12 Mar 2026 04:14:27 -0700 (PDT) From: Soumyajyotii Ssarkar To: xen-devel@lists.xenproject.org, sarkarsoumyajyoti23@gmail.com Cc: Andrew Cooper , "Daniel P . Smith" , =?UTF-8?q?Marek=20Marczykowski-G=C3=B3recki?= , Jan Beulich , =?UTF-8?q?Roger=20Pau=20Monn=C3=A9?= , Soumyajyotii Ssarkar Subject: [RFC PATCH v3 2/3] x86/acpi: Integrate BGRT preservation with status reporting Date: Thu, 12 Mar 2026 16:44:13 +0530 Message-ID: <20260312111414.17808-3-soumyajyotisarkar23@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260312111414.17808-1-soumyajyotisarkar23@gmail.com> References: <20260312111414.17808-1-soumyajyotisarkar23@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @gmail.com) X-ZM-MESSAGEID: 1773314091313154100 Content-Type: text/plain; charset="utf-8" Add status reporting for BGRT preservation and integrate with Xen's ACPI subsystem: - efi_bgrt_status_info() prints preservation status (success/failure) - Called from acpi_boot_init() after ACPI tables are processed - Clarifying comment explains why invalidation code remains The invalidation code in acpi_invalidate_bgrt() now acts as a safety net: if preservation fails, the image remains in conventional RAM and gets invalidated. If preservation succeeds, the image is in EfiACPIReclaimMemory which won't match the RAM_TYPE_CONVENTIONAL check, leaving the table valid. Signed-off-by: Soumyajyotii Ssarkar --- xen/arch/x86/acpi/boot.c | 8 ++++++++ xen/common/efi/boot.c | 16 ++++++++++++++++ xen/include/xen/efi.h | 1 + 3 files changed, 25 insertions(+) diff --git a/xen/arch/x86/acpi/boot.c b/xen/arch/x86/acpi/boot.c index 1ca2360e00..20afe79db9 100644 --- a/xen/arch/x86/acpi/boot.c +++ b/xen/arch/x86/acpi/boot.c @@ -29,6 +29,7 @@ #include #include #include +#include #include #include #include @@ -327,6 +328,11 @@ static int __init cf_check acpi_parse_hpet(struct acpi= _table_header *table) return 0; } +/* + * Invalidate BGRT if image is in conventional RAM (preservation failed). + * If preservation succeeded, image is in EfiACPIReclaimMemory, which + * won't match RAM_TYPE_CONVENTIONAL check, so table remains valid. + */ static int __init cf_check acpi_invalidate_bgrt(struct acpi_table_header *= table) { struct acpi_table_bgrt *bgrt_tbl =3D @@ -754,5 +760,7 @@ int __init acpi_boot_init(void) acpi_table_parse(ACPI_SIG_BGRT, acpi_invalidate_bgrt); + efi_bgrt_status_info(); + return 0; } diff --git a/xen/common/efi/boot.c b/xen/common/efi/boot.c index e6451130ce..68e06d707c 100644 --- a/xen/common/efi/boot.c +++ b/xen/common/efi/boot.c @@ -1911,6 +1911,22 @@ static bool __init cf_check rt_range_valid(unsigned = long smfn, unsigned long emf return true; } +void __init efi_bgrt_status_info(void) +{ + if ( !efi_enabled(EFI_BOOT) ) + return; + + if ( bgrt_info.preserved ) + { + printk(XENLOG_INFO "EFI: BGRT image preserved: %lu KB\n", + bgrt_info.size / 1024); + printk(XENLOG_INFO "EFI: BGRT relocated from %p to %p\n", + bgrt_info.old_addr, bgrt_info.new_addr); + } + else if ( bgrt_info.failure_reason[0] ) + printk(XENLOG_WARNING "EFI: BGRT preservation failed: %s\n", + bgrt_info.failure_reason); +} void __init efi_init_memory(void) { diff --git a/xen/include/xen/efi.h b/xen/include/xen/efi.h index 723cb80852..e72ab3c6b5 100644 --- a/xen/include/xen/efi.h +++ b/xen/include/xen/efi.h @@ -39,6 +39,7 @@ static inline bool efi_enabled(unsigned int feature) extern bool efi_secure_boot; void efi_init_memory(void); +void efi_bgrt_status_info(void); bool efi_boot_mem_unused(unsigned long *start, unsigned long *end); bool efi_rs_using_pgtables(void); unsigned long efi_get_time(void); -- 2.53.0