All of lore.kernel.org
 help / color / mirror / Atom feed
From: Kristina Martsenko <kristina.martsenko@arm.com>
To: stable@vger.kernel.org
Cc: Catalin Marinas <catalin.marinas@arm.com>,
	Christoffer Dall <christoffer.dall@arm.com>,
	Marc Zyngier <marc.zyngier@arm.com>,
	Mark Rutland <mark.rutland@arm.com>,
	Will Deacon <will.deacon@arm.com>
Subject: [PATCH 4.4 1/2] arm64/kvm: consistently handle host HCR_EL2 flags
Date: Fri, 18 Jan 2019 17:55:53 +0000	[thread overview]
Message-ID: <20190118175554.6359-1-kristina.martsenko@arm.com> (raw)
In-Reply-To: <7acde9fd-242b-0850-81b3-6dbd4cc75565@arm.com>

From: Mark Rutland <mark.rutland@arm.com>

[ Backport of upstream commit 4eaed6aa2c628101246bcabc91b203bfac1193f8 ]

In KVM we define the configuration of HCR_EL2 for a VHE HOST in
HCR_HOST_VHE_FLAGS, but we don't have a similar definition for the
non-VHE host flags, and open-code HCR_RW. Further, in head.S we
open-code the flags for VHE and non-VHE configurations.

In future, we're going to want to configure more flags for the host, so
lets add a HCR_HOST_NVHE_FLAGS defintion, and consistently use both
HCR_HOST_VHE_FLAGS and HCR_HOST_NVHE_FLAGS in the kvm code and head.S.

We now use mov_q to generate the HCR_EL2 value, as we use when
configuring other registers in head.S.

Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Reviewed-by: Christoffer Dall <christoffer.dall@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: kvmarm@lists.cs.columbia.edu
Signed-off-by: Will Deacon <will.deacon@arm.com>
[kristina: backport to 4.4.y: non-VHE only; __deactivate_traps_nvhe in
  assembly; add #include]
Signed-off-by: Kristina Martsenko <kristina.martsenko@arm.com>
---
 arch/arm64/include/asm/kvm_arm.h | 1 +
 arch/arm64/kernel/head.S         | 3 ++-
 arch/arm64/kvm/hyp.S             | 2 +-
 3 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/include/asm/kvm_arm.h b/arch/arm64/include/asm/kvm_arm.h
index ef8e13d379cb..013b7de45ee7 100644
--- a/arch/arm64/include/asm/kvm_arm.h
+++ b/arch/arm64/include/asm/kvm_arm.h
@@ -81,6 +81,7 @@
 			 HCR_AMO | HCR_SWIO | HCR_TIDCP | HCR_RW)
 #define HCR_VIRT_EXCP_MASK (HCR_VA | HCR_VI | HCR_VF)
 #define HCR_INT_OVERRIDE   (HCR_FMO | HCR_IMO)
+#define HCR_HOST_NVHE_FLAGS (HCR_RW)
 
 
 /* Hyp System Control Register (SCTLR_EL2) bits */
diff --git a/arch/arm64/kernel/head.S b/arch/arm64/kernel/head.S
index d019c3a58cc2..0382eba4bf7b 100644
--- a/arch/arm64/kernel/head.S
+++ b/arch/arm64/kernel/head.S
@@ -30,6 +30,7 @@
 #include <asm/cache.h>
 #include <asm/cputype.h>
 #include <asm/kernel-pgtable.h>
+#include <asm/kvm_arm.h>
 #include <asm/memory.h>
 #include <asm/pgtable-hwdef.h>
 #include <asm/pgtable.h>
@@ -464,7 +465,7 @@ CPU_LE(	bic	x0, x0, #(3 << 24)	)	// Clear the EE and E0E bits for EL1
 	ret
 
 	/* Hyp configuration. */
-2:	mov	x0, #(1 << 31)			// 64-bit EL1
+2:	mov_q	x0, HCR_HOST_NVHE_FLAGS
 	msr	hcr_el2, x0
 
 	/* Generic timers. */
diff --git a/arch/arm64/kvm/hyp.S b/arch/arm64/kvm/hyp.S
index 86c289832272..8d3da858c257 100644
--- a/arch/arm64/kvm/hyp.S
+++ b/arch/arm64/kvm/hyp.S
@@ -494,7 +494,7 @@
 .endm
 
 .macro deactivate_traps
-	mov	x2, #HCR_RW
+	mov_q	x2, HCR_HOST_NVHE_FLAGS
 	msr	hcr_el2, x2
 	msr	hstr_el2, xzr
 
-- 
2.11.0


  reply	other threads:[~2019-01-18 17:56 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-01-18 17:53 Two arm64 patches for stable Kristina Martsenko
2019-01-18 17:55 ` Kristina Martsenko [this message]
2019-01-18 17:55   ` [PATCH 4.4 2/2] arm64: Don't trap host pointer auth use to EL2 Kristina Martsenko
2019-01-18 17:56 ` [PATCH 4.9 1/2] arm64/kvm: consistently handle host HCR_EL2 flags Kristina Martsenko
2019-01-18 17:56   ` [PATCH 4.9 2/2] arm64: Don't trap host pointer auth use to EL2 Kristina Martsenko
2019-01-18 17:56 ` [PATCH 4.14 1/2] arm64/kvm: consistently handle host HCR_EL2 flags Kristina Martsenko
2019-01-18 17:56   ` [PATCH 4.14 2/2] arm64: Don't trap host pointer auth use to EL2 Kristina Martsenko
2019-01-19  2:07 ` Two arm64 patches for stable Sasha Levin

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=20190118175554.6359-1-kristina.martsenko@arm.com \
    --to=kristina.martsenko@arm.com \
    --cc=catalin.marinas@arm.com \
    --cc=christoffer.dall@arm.com \
    --cc=marc.zyngier@arm.com \
    --cc=mark.rutland@arm.com \
    --cc=stable@vger.kernel.org \
    --cc=will.deacon@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.