All of lore.kernel.org
 help / color / mirror / Atom feed
From: Anshuman Khandual <anshuman.khandual@arm.com>
To: linux-arm-kernel@lists.infradead.org, mark.rutland@arm.com
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Subject: [bootwrapper PATCH 2/2] aarch64: Disable trapping into EL3 while accessing FEAT_FGT2 registers
Date: Thu,  4 Apr 2024 13:07:26 +0530	[thread overview]
Message-ID: <20240404073726.947215-3-anshuman.khandual@arm.com> (raw)
In-Reply-To: <20240404073726.947215-1-anshuman.khandual@arm.com>

This disables trapping into EL3 while accessing Fine Grained Traps Enable 2
(i.e FEAT_FGT2) registers such as HDFGRTR2_EL2, HDFGWTR2_EL2, HFGITR2_EL2,
HFGRTR2_EL2 and HFGWTR2_EL2 via setting SCR_EL3.FGTEN2. But first ensure
that FEAT_FGT2 feature is implemented looking into ID_AA64MMFR0_EL1.

Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
---
 arch/aarch64/include/asm/cpu.h | 1 +
 arch/aarch64/init.c            | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/arch/aarch64/include/asm/cpu.h b/arch/aarch64/include/asm/cpu.h
index 124ef91..56f319a 100644
--- a/arch/aarch64/include/asm/cpu.h
+++ b/arch/aarch64/include/asm/cpu.h
@@ -57,6 +57,7 @@
 #define SCR_EL3_EnTP2			BIT(41)
 #define SCR_EL3_TCR2EN			BIT(43)
 #define SCR_EL3_PIEN			BIT(45)
+#define SCR_EL3_FGTEN2			BIT(59)
 
 #define HCR_EL2_RES1			BIT(1)
 
diff --git a/arch/aarch64/init.c b/arch/aarch64/init.c
index 37cb45f..557266b 100644
--- a/arch/aarch64/init.c
+++ b/arch/aarch64/init.c
@@ -68,6 +68,9 @@ void cpu_init_el3(void)
 	if (mrs_field(ID_AA64MMFR0_EL1, FGT))
 		scr |= SCR_EL3_FGTEN;
 
+	if (mrs_field(ID_AA64MMFR0_EL1, FGT) >= 2)
+		scr |= SCR_EL3_FGTEN2;
+
 	if (mrs_field(ID_AA64MMFR0_EL1, ECV) >= 2)
 		scr |= SCR_EL3_ECVEN;
 
-- 
2.25.1


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  parent reply	other threads:[~2024-04-04  7:37 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-04-04  7:37 [bootwrapper PATCH 0/2] aarch64: Prepare EL3 for MDSELR_EL1 Anshuman Khandual
2024-04-04  7:37 ` [bootwrapper PATCH 1/2] aarch64: Disable trapping into EL3 while accessing MDSELR_EL1 Anshuman Khandual
2024-04-18 10:27   ` Mark Rutland
2024-04-19  2:21     ` Anshuman Khandual
2024-04-04  7:37 ` Anshuman Khandual [this message]
2024-04-18 10:40   ` [bootwrapper PATCH 2/2] aarch64: Disable trapping into EL3 while accessing FEAT_FGT2 registers Mark Rutland
2024-04-19  3:04     ` Anshuman Khandual
2024-04-17  3:25 ` [bootwrapper PATCH 0/2] aarch64: Prepare EL3 for MDSELR_EL1 Anshuman Khandual
2024-04-18 10:43   ` Mark Rutland

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20240404073726.947215-3-anshuman.khandual@arm.com \
    --to=anshuman.khandual@arm.com \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=mark.rutland@arm.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.