Commit-ID: ab6ec39a191243b9968bb9ac7f26cc7ec30c618b
Gitweb: http://git.kernel.org/tip/ab6ec39a191243b9968bb9ac7f26cc7ec30c618b
Author: Lin Ming <mlin@xxxxxxxxxxxxx>
AuthorDate: Tue, 1 May 2012 00:16:27 +0800
Committer: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
CommitDate: Tue, 1 May 2012 14:52:12 -0400
xen/apic: implement io apic read with hypercall
Implements xen_io_apic_read with hypercall, so it returns proper
IO-APIC information instead of fabricated one.
Fallback to return an emulated IO_APIC values if hypercall fails.
[v2: fallback to return an emulated IO_APIC values if hypercall fails]
Signed-off-by: Lin Ming <mlin@xxxxxxxxxxxxx>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
---
arch/x86/xen/apic.c | 13 +++++++++++++
1 files changed, 13 insertions(+), 0 deletions(-)
diff --git a/arch/x86/xen/apic.c b/arch/x86/xen/apic.c
index 73ade38..1913bf2 100644
--- a/arch/x86/xen/apic.c
+++ b/arch/x86/xen/apic.c
@@ -1,8 +1,21 @@
#include <linux/init.h>
#include <asm/x86_init.h>
+#include <asm/apic.h>
+#include <xen/interface/physdev.h>
+#include <asm/xen/hypercall.h>
unsigned int xen_io_apic_read(unsigned apic, unsigned reg)
{
+ struct physdev_apic apic_op;
+ int ret;
+
+ apic_op.apic_physbase = mpc_ioapic_addr(apic);
+ apic_op.reg = reg;
+ ret = HYPERVISOR_physdev_op(PHYSDEVOP_apic_read, &apic_op);
+ if (!ret)
+ return apic_op.value;
+
+ /* fallback to return an emulated IO_APIC values */
if (reg == 0x1)
return 0x00170020;
else if (reg == 0x0)
--
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