[PATCH 08/10] KVM: arm64: Add save/restore for PIR{,E0}_EL2

[Marc Zyngier <maz@kernel.org>]

Like their EL1 equivalent, the EL2-specific FEAT_S1PIE registers
are context-switched. This is made conditional on both FEAT_TCRX
and FEAT_S1PIE being adversised.

Note that this change only makes sense if read together with the
issue D22677 contained in 102105_K.a_04_en.

Signed-off-by: Marc Zyngier <maz@kernel.org>
---
 arch/arm64/kvm/hyp/vhe/sysreg-sr.c | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/kvm/hyp/vhe/sysreg-sr.c b/arch/arm64/kvm/hyp/vhe/sysreg-sr.c
index 7099775cd505..01551037df08 100644
--- a/arch/arm64/kvm/hyp/vhe/sysreg-sr.c
+++ b/arch/arm64/kvm/hyp/vhe/sysreg-sr.c
@@ -51,9 +51,15 @@ static void __sysreg_save_vel2_state(struct kvm_cpu_context *ctxt)
 		ctxt_sys_reg(ctxt, TTBR1_EL2)	= read_sysreg_el1(SYS_TTBR1);
 		ctxt_sys_reg(ctxt, TCR_EL2)	= read_sysreg_el1(SYS_TCR);
 
-		if (ctxt_has_tcrx(ctxt))
+		if (ctxt_has_tcrx(ctxt)) {
 			ctxt_sys_reg(ctxt, TCR2_EL2) = read_sysreg_el1(SYS_TCR2);
 
+			if (ctxt_has_s1pie(ctxt)) {
+				ctxt_sys_reg(ctxt, PIRE0_EL2) = read_sysreg_el1(SYS_PIRE0);
+				ctxt_sys_reg(ctxt, PIR_EL2) = read_sysreg_el1(SYS_PIR);
+			}
+		}
+
 		/*
 		 * The EL1 view of CNTKCTL_EL1 has a bunch of RES0 bits where
 		 * the interesting CNTHCTL_EL2 bits live. So preserve these
@@ -111,9 +117,15 @@ static void __sysreg_restore_vel2_state(struct kvm_cpu_context *ctxt)
 		write_sysreg_el1(val, SYS_TCR);
 	}
 
-	if (ctxt_has_tcrx(ctxt))
+	if (ctxt_has_tcrx(ctxt)) {
 		write_sysreg_el1(ctxt_sys_reg(ctxt, TCR2_EL2), SYS_TCR2);
 
+		if (ctxt_has_s1pie(ctxt)) {
+			write_sysreg_el1(ctxt_sys_reg(ctxt, PIR_EL2),	SYS_PIR);
+			write_sysreg_el1(ctxt_sys_reg(ctxt, PIRE0_EL2),	SYS_PIRE0);
+		}
+	}
+
 	write_sysreg_el1(ctxt_sys_reg(ctxt, ESR_EL2),	SYS_ESR);
 	write_sysreg_el1(ctxt_sys_reg(ctxt, AFSR0_EL2),	SYS_AFSR0);
 	write_sysreg_el1(ctxt_sys_reg(ctxt, AFSR1_EL2),	SYS_AFSR1);
-- 
2.39.2