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authorTyler Baicar <tbaicar@codeaurora.org>2017-06-21 12:17:14 -0600
committerWill Deacon <will.deacon@arm.com>2017-06-22 18:22:05 +0100
commit621f48e40ee9b0100a802531069166d7d94796e0 (patch)
tree3411689c2307e6f82325354c85c8940cf9aec483 /arch/arm64/mm
parenttrace, ras: add ARM processor error trace event (diff)
downloadlinux-dev-621f48e40ee9b0100a802531069166d7d94796e0.tar.xz
linux-dev-621f48e40ee9b0100a802531069166d7d94796e0.zip
arm/arm64: KVM: add guest SEA support
Currently external aborts are unsupported by the guest abort handling. Add handling for SEAs so that the host kernel reports SEAs which occur in the guest kernel. When an SEA occurs in the guest kernel, the guest exits and is routed to kvm_handle_guest_abort(). Prior to this patch, a print message of an unsupported FSC would be printed and nothing else would happen. With this patch, the code gets routed to the APEI handling of SEAs in the host kernel to report the SEA information. Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Marc Zyngier <marc.zyngier@arm.com> Acked-by: Christoffer Dall <cdall@linaro.org> Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64/mm')
-rw-r--r--arch/arm64/mm/fault.c22
1 files changed, 20 insertions, 2 deletions
diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
index 07481af15fd7..a8c9f2db20ba 100644
--- a/arch/arm64/mm/fault.c
+++ b/arch/arm64/mm/fault.c
@@ -532,6 +532,7 @@ static int do_sea(unsigned long addr, unsigned int esr, struct pt_regs *regs)
{
struct siginfo info;
const struct fault_info *inf;
+ int ret = 0;
inf = esr_to_fault_info(esr);
pr_err("Synchronous External Abort: %s (0x%08x) at 0x%016lx\n",
@@ -546,7 +547,7 @@ static int do_sea(unsigned long addr, unsigned int esr, struct pt_regs *regs)
if (interrupts_enabled(regs))
nmi_enter();
- ghes_notify_sea();
+ ret = ghes_notify_sea();
if (interrupts_enabled(regs))
nmi_exit();
@@ -561,7 +562,7 @@ static int do_sea(unsigned long addr, unsigned int esr, struct pt_regs *regs)
info.si_addr = (void __user *)addr;
arm64_notify_die("", regs, &info, esr);
- return 0;
+ return ret;
}
static const struct fault_info fault_info[] = {
@@ -632,6 +633,23 @@ static const struct fault_info fault_info[] = {
};
/*
+ * Handle Synchronous External Aborts that occur in a guest kernel.
+ *
+ * The return value will be zero if the SEA was successfully handled
+ * and non-zero if there was an error processing the error or there was
+ * no error to process.
+ */
+int handle_guest_sea(phys_addr_t addr, unsigned int esr)
+{
+ int ret = -ENOENT;
+
+ if (IS_ENABLED(CONFIG_ACPI_APEI_SEA))
+ ret = ghes_notify_sea();
+
+ return ret;
+}
+
+/*
* Dispatch a data abort to the relevant handler.
*/
asmlinkage void __exception do_mem_abort(unsigned long addr, unsigned int esr,