linux-kernel - [PATCH v2 05/18] arm64: KVM/VHE: enable the use PMSCR

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Message-Id: <20191220143025.33853-6-andrew.murray@arm.com>
Date:   Fri, 20 Dec 2019 14:30:12 +0000
From:   Andrew Murray <andrew.murray@....com>
To:     Marc Zyngier <marc.zyngier@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>
Cc:     Sudeep Holla <sudeep.holla@....com>, kvmarm@...ts.cs.columbia.edu,
        linux-arm-kernel@...ts.infradead.org, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Mark Rutland <mark.rutland@....com>
Subject: [PATCH v2 05/18] arm64: KVM/VHE: enable the use PMSCR_EL12 on VHE systems

From: Sudeep Holla <sudeep.holla@....com>

Currently, we are just using PMSCR_EL1 in the host for non VHE systems.
We already have the {read,write}_sysreg_el*() accessors for accessing
particular ELs' sysregs in the presence of VHE.

Lets just define PMSCR_EL12 and start making use of it here which will
access the right register on both VHE and non VHE systems. This change
is required to add SPE guest support on VHE systems.

Signed-off-by: Sudeep Holla <sudeep.holla@....com>
Signed-off-by: Andrew Murray <andrew.murray@....com>
---
 arch/arm64/include/asm/sysreg.h | 1 +
 arch/arm64/kvm/hyp/debug-sr.c   | 6 +++---
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/arch/arm64/include/asm/sysreg.h b/arch/arm64/include/asm/sysreg.h
index 6e919fafb43d..6c0b0ad97688 100644
--- a/arch/arm64/include/asm/sysreg.h
+++ b/arch/arm64/include/asm/sysreg.h
@@ -468,6 +468,7 @@
 #define SYS_AFSR1_EL12			sys_reg(3, 5, 5, 1, 1)
 #define SYS_ESR_EL12			sys_reg(3, 5, 5, 2, 0)
 #define SYS_FAR_EL12			sys_reg(3, 5, 6, 0, 0)
+#define SYS_PMSCR_EL12			sys_reg(3, 5, 9, 9, 0)
 #define SYS_MAIR_EL12			sys_reg(3, 5, 10, 2, 0)
 #define SYS_AMAIR_EL12			sys_reg(3, 5, 10, 3, 0)
 #define SYS_VBAR_EL12			sys_reg(3, 5, 12, 0, 0)
diff --git a/arch/arm64/kvm/hyp/debug-sr.c b/arch/arm64/kvm/hyp/debug-sr.c
index 0fc9872a1467..98be2f11c16c 100644
--- a/arch/arm64/kvm/hyp/debug-sr.c
+++ b/arch/arm64/kvm/hyp/debug-sr.c
@@ -108,8 +108,8 @@ static void __hyp_text __debug_save_spe_nvhe(u64 *pmscr_el1)
 		return;
 
 	/* Yes; save the control register and disable data generation */
-	*pmscr_el1 = read_sysreg_s(SYS_PMSCR_EL1);
-	write_sysreg_s(0, SYS_PMSCR_EL1);
+	*pmscr_el1 = read_sysreg_el1(SYS_PMSCR);
+	write_sysreg_el1(0, SYS_PMSCR);
 	isb();
 
 	/* Now drain all buffered data to memory */
@@ -126,7 +126,7 @@ static void __hyp_text __debug_restore_spe_nvhe(u64 pmscr_el1)
 	isb();
 
 	/* Re-enable data generation */
-	write_sysreg_s(pmscr_el1, SYS_PMSCR_EL1);
+	write_sysreg_el1(pmscr_el1, SYS_PMSCR);
 }
 
 static void __hyp_text __debug_save_state(struct kvm_vcpu *vcpu,
-- 
2.21.0