Commit 3204be41 authored Jun 09, 2020 by Marc Zyngier

KVM: arm64: Make vcpu_cp1x() work on Big Endian hosts



AArch32 CP1x registers are overlayed on their AArch64 counterparts
in the vcpu struct. This leads to an interesting problem as they
are stored in their CPU-local format, and thus a CP1x register
doesn't "hit" the lower 32bit portion of the AArch64 register on
a BE host.

To workaround this unfortunate situation, introduce a bias trick
in the vcpu_cp1x() accessors which picks the correct half of the
64bit register.

Cc: stable@vger.kernel.org
Reported-by: James Morse <james.morse@arm.com>
Tested-by: James Morse <james.morse@arm.com>
Acked-by: James Morse <james.morse@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>

parent e8679fed

arch/arm64/include/asm/kvm_host.h

+4 −2

Original line number	Diff line number	Diff line
		@@ -404,8 +404,10 @@ void vcpu_write_sys_reg(struct kvm_vcpu *vcpu, u64 val, int reg);
		* CP14 and CP15 live in the same array, as they are backed by the
		* same system registers.
		*/
		#define vcpu_cp14(v,r) ((v)->arch.ctxt.copro[(r)])
		#define vcpu_cp15(v,r) ((v)->arch.ctxt.copro[(r)])
		#define CPx_BIAS IS_ENABLED(CONFIG_CPU_BIG_ENDIAN)

		#define vcpu_cp14(v,r) ((v)->arch.ctxt.copro[(r) ^ CPx_BIAS])
		#define vcpu_cp15(v,r) ((v)->arch.ctxt.copro[(r) ^ CPx_BIAS])

		struct kvm_vm_stat {
		ulong remote_tlb_flush;

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