linux-kernel - [PATCH v3 4/5] efi: Actually enable the ESRT under Xen

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Message-Id: <26938d59bb398bea7e8f43d03a9c75189fa3b4cc.1669264419.git.demi@invisiblethingslab.com>
Date:   Thu, 19 Jan 2023 14:03:59 -0500
From:   Demi Marie Obenour <demi@...isiblethingslab.com>
To:     Ard Biesheuvel <ardb@...nel.org>, Juergen Gross <jgross@...e.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>
Cc:     Demi Marie Obenour <demi@...isiblethingslab.com>,
        Marek Marczykowski-Górecki 
        <marmarek@...isiblethingslab.com>, linux-efi@...r.kernel.org,
        linux-kernel@...r.kernel.org, xen-devel@...ts.xenproject.org
Subject: [PATCH v3 4/5] efi: Actually enable the ESRT under Xen

The ESRT can be parsed if EFI_PARAVIRT is enabled, even if EFI_MEMMAP is
not.  Also allow the ESRT to be in reclaimable memory, as that is where
future Xen versions will put it.

Reported-by: Marek Marczykowski-Górecki <marmarek@...isiblethingslab.com>
Signed-off-by: Demi Marie Obenour <demi@...isiblethingslab.com>
Tested-by: Marek Marczykowski-Górecki <marmarek@...isiblethingslab.com>
---
 drivers/firmware/efi/esrt.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/firmware/efi/esrt.c b/drivers/firmware/efi/esrt.c
index fb9fb70e1004132eff50c712c6fca05f7aeb1d57..87729c365be1a804bb84e0b1ab874042848327b4 100644
--- a/drivers/firmware/efi/esrt.c
+++ b/drivers/firmware/efi/esrt.c
@@ -247,7 +247,7 @@ void __init efi_esrt_init(void)
 	int rc;
 	phys_addr_t end;
 
-	if (!efi_enabled(EFI_MEMMAP))
+	if (!efi_enabled(EFI_MEMMAP) && !efi_enabled(EFI_PARAVIRT))
 		return;
 
 	pr_debug("esrt-init: loading.\n");
@@ -258,7 +258,9 @@ void __init efi_esrt_init(void)
 	if (rc < 0 ||
 	    (!(md.attribute & EFI_MEMORY_RUNTIME) &&
 	     md.type != EFI_BOOT_SERVICES_DATA &&
-	     md.type != EFI_RUNTIME_SERVICES_DATA)) {
+	     md.type != EFI_RUNTIME_SERVICES_DATA &&
+	     md.type != EFI_ACPI_RECLAIM_MEMORY &&
+	     md.type != EFI_ACPI_MEMORY_NVS)) {
 		pr_warn("ESRT header is not in the memory map.\n");
 		return;
 	}
-- 
Sincerely,
Demi Marie Obenour (she/her/hers)
Invisible Things Lab