[PATCH v3 06/25] KVM: arm64: Save/restore POE registers

[Joey Gouly]

Define the new system registers that POE introduces and context switch them.

Signed-off-by: Joey Gouly <joey.gouly at arm.com>
Cc: Marc Zyngier <maz at kernel.org>
Cc: Oliver Upton <oliver.upton at linux.dev>
Cc: Catalin Marinas <catalin.marinas at arm.com>
Cc: Will Deacon <will at kernel.org>
---
 arch/arm64/include/asm/kvm_arm.h           |  4 ++--
 arch/arm64/include/asm/kvm_host.h          |  4 ++++
 arch/arm64/kvm/hyp/include/hyp/sysreg-sr.h | 10 ++++++++++
 arch/arm64/kvm/sys_regs.c                  |  2 ++
 4 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/include/asm/kvm_arm.h b/arch/arm64/include/asm/kvm_arm.h
index b85f46a73e21..597470e0b87b 100644
--- a/arch/arm64/include/asm/kvm_arm.h
+++ b/arch/arm64/include/asm/kvm_arm.h
@@ -346,14 +346,14 @@
  */
 #define __HFGRTR_EL2_RES0	(GENMASK(63, 56) | GENMASK(53, 51))
 #define __HFGRTR_EL2_MASK	GENMASK(49, 0)
-#define __HFGRTR_EL2_nMASK	(GENMASK(58, 57) | GENMASK(55, 54) | BIT(50))
+#define __HFGRTR_EL2_nMASK	(GENMASK(60, 57) | GENMASK(55, 54) | BIT(50))
 
 #define __HFGWTR_EL2_RES0	(GENMASK(63, 56) | GENMASK(53, 51) |	\
 				 BIT(46) | BIT(42) | BIT(40) | BIT(28) | \
 				 GENMASK(26, 25) | BIT(21) | BIT(18) |	\
 				 GENMASK(15, 14) | GENMASK(10, 9) | BIT(2))
 #define __HFGWTR_EL2_MASK	GENMASK(49, 0)
-#define __HFGWTR_EL2_nMASK	(GENMASK(58, 57) | GENMASK(55, 54) | BIT(50))
+#define __HFGWTR_EL2_nMASK	(GENMASK(60, 57) | GENMASK(55, 54) | BIT(50))
 
 #define __HFGITR_EL2_RES0	GENMASK(63, 57)
 #define __HFGITR_EL2_MASK	GENMASK(54, 0)
diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index 824f29f04916..fa9ebd8fce40 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -401,6 +401,10 @@ enum vcpu_sysreg {
 	PIR_EL1,       /* Permission Indirection Register 1 (EL1) */
 	PIRE0_EL1,     /*  Permission Indirection Register 0 (EL1) */
 
+	/* Permission Overlay Extension registers */
+	POR_EL1,	/* Permission Overlay Register 1 (EL1) */
+	POR_EL0,	/* Permission Overlay Register 0 (EL0) */
+
 	/* 32bit specific registers. */
 	DACR32_EL2,	/* Domain Access Control Register */
 	IFSR32_EL2,	/* Instruction Fault Status Register */
diff --git a/arch/arm64/kvm/hyp/include/hyp/sysreg-sr.h b/arch/arm64/kvm/hyp/include/hyp/sysreg-sr.h
index bb6b571ec627..22f07ee43e7e 100644
--- a/arch/arm64/kvm/hyp/include/hyp/sysreg-sr.h
+++ b/arch/arm64/kvm/hyp/include/hyp/sysreg-sr.h
@@ -19,6 +19,9 @@
 static inline void __sysreg_save_common_state(struct kvm_cpu_context *ctxt)
 {
 	ctxt_sys_reg(ctxt, MDSCR_EL1)	= read_sysreg(mdscr_el1);
+
+	if (system_supports_poe())
+		ctxt_sys_reg(ctxt, POR_EL0)	= read_sysreg_s(SYS_POR_EL0);
 }
 
 static inline void __sysreg_save_user_state(struct kvm_cpu_context *ctxt)
@@ -59,6 +62,8 @@ static inline void __sysreg_save_el1_state(struct kvm_cpu_context *ctxt)
 		ctxt_sys_reg(ctxt, PIR_EL1)	= read_sysreg_el1(SYS_PIR);
 		ctxt_sys_reg(ctxt, PIRE0_EL1)	= read_sysreg_el1(SYS_PIRE0);
 	}
+	if (system_supports_poe())
+		ctxt_sys_reg(ctxt, POR_EL1)	= read_sysreg_el1(SYS_POR);
 	ctxt_sys_reg(ctxt, PAR_EL1)	= read_sysreg_par();
 	ctxt_sys_reg(ctxt, TPIDR_EL1)	= read_sysreg(tpidr_el1);
 
@@ -89,6 +94,9 @@ static inline void __sysreg_save_el2_return_state(struct kvm_cpu_context *ctxt)
 static inline void __sysreg_restore_common_state(struct kvm_cpu_context *ctxt)
 {
 	write_sysreg(ctxt_sys_reg(ctxt, MDSCR_EL1),  mdscr_el1);
+
+	if (system_supports_poe())
+		write_sysreg_s(ctxt_sys_reg(ctxt, POR_EL0),	SYS_POR_EL0);
 }
 
 static inline void __sysreg_restore_user_state(struct kvm_cpu_context *ctxt)
@@ -135,6 +143,8 @@ static inline void __sysreg_restore_el1_state(struct kvm_cpu_context *ctxt)
 		write_sysreg_el1(ctxt_sys_reg(ctxt, PIR_EL1),	SYS_PIR);
 		write_sysreg_el1(ctxt_sys_reg(ctxt, PIRE0_EL1),	SYS_PIRE0);
 	}
+	if (system_supports_poe())
+		write_sysreg_el1(ctxt_sys_reg(ctxt, POR_EL1),	SYS_POR);
 	write_sysreg(ctxt_sys_reg(ctxt, PAR_EL1),	par_el1);
 	write_sysreg(ctxt_sys_reg(ctxt, TPIDR_EL1),	tpidr_el1);
 
diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index 4735e1b37fb3..a54e5eadbf29 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -2269,6 +2269,7 @@ static const struct sys_reg_desc sys_reg_descs[] = {
 	{ SYS_DESC(SYS_MAIR_EL1), access_vm_reg, reset_unknown, MAIR_EL1 },
 	{ SYS_DESC(SYS_PIRE0_EL1), NULL, reset_unknown, PIRE0_EL1 },
 	{ SYS_DESC(SYS_PIR_EL1), NULL, reset_unknown, PIR_EL1 },
+	{ SYS_DESC(SYS_POR_EL1), NULL, reset_unknown, POR_EL1 },
 	{ SYS_DESC(SYS_AMAIR_EL1), access_vm_reg, reset_amair_el1, AMAIR_EL1 },
 
 	{ SYS_DESC(SYS_LORSA_EL1), trap_loregion },
@@ -2352,6 +2353,7 @@ static const struct sys_reg_desc sys_reg_descs[] = {
 	  .access = access_pmovs, .reg = PMOVSSET_EL0,
 	  .get_user = get_pmreg, .set_user = set_pmreg },
 
+	{ SYS_DESC(SYS_POR_EL0), NULL, reset_unknown, POR_EL0 },
 	{ SYS_DESC(SYS_TPIDR_EL0), NULL, reset_unknown, TPIDR_EL0 },
 	{ SYS_DESC(SYS_TPIDRRO_EL0), NULL, reset_unknown, TPIDRRO_EL0 },
 	{ SYS_DESC(SYS_TPIDR2_EL0), undef_access },
-- 
2.25.1