linux-kernel - [PATCH v1 17/24] kvm: arm64: Add __hyp_pa

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Date:   Mon,  9 Nov 2020 11:32:26 +0000
From:   David Brazdil <dbrazdil@...gle.com>
To:     kvmarm@...ts.cs.columbia.edu
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Marc Zyngier <maz@...nel.org>,
        James Morse <james.morse@....com>,
        Julien Thierry <julien.thierry.kdev@...il.com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Dennis Zhou <dennis@...nel.org>,
        Tejun Heo <tj@...nel.org>, Christoph Lameter <cl@...ux.com>,
        Mark Rutland <mark.rutland@....com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Quentin Perret <qperret@...gle.com>,
        Andrew Scull <ascull@...gle.com>,
        Andrew Walbran <qwandor@...gle.com>, kernel-team@...roid.com,
        David Brazdil <dbrazdil@...gle.com>
Subject: [PATCH v1 17/24] kvm: arm64: Add __hyp_pa_symbol helper macro

Add helper macro for computing the PA of a kernel symbol in nVHE hyp
code. This will be useful for computing the PA of a PSCI CPU_ON entry
point.

Signed-off-by: David Brazdil <dbrazdil@...gle.com>
---
 arch/arm64/kvm/hyp/nvhe/psci.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/arm64/kvm/hyp/nvhe/psci.c b/arch/arm64/kvm/hyp/nvhe/psci.c
index b0b5df590ba5..7510b9e174e9 100644
--- a/arch/arm64/kvm/hyp/nvhe/psci.c
+++ b/arch/arm64/kvm/hyp/nvhe/psci.c
@@ -20,6 +20,16 @@ s64 hyp_physvirt_offset;
 
 #define __hyp_pa(x) ((phys_addr_t)((x)) + hyp_physvirt_offset)
 
+#define __hyp_pa_symbol(sym)					\
+	({							\
+		extern char sym[];				\
+		unsigned long kern_va;				\
+								\
+		asm volatile("ldr %0, =%1" : "=r" (kern_va)	\
+					   : "S" (sym));	\
+		kern_va - kimage_voffset;			\
+	})
+
 static u64 get_psci_func_id(struct kvm_cpu_context *host_ctxt)
 {
 	return host_ctxt->regs.regs[0];
-- 
2.29.2.222.g5d2a92d10f8-goog