[kvm-unit-tests PATCH v2 05/10] x86: efi: Stop using UEFI-provided stack

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UEFI test builds currently use the stack pointer configured by the
UEFI implementation.

Reserve stack space in .data for EFI testcases and switch %rsp to
use this memory on early boot. This provides one 4K page per CPU
to store its stack / percpu data.

Signed-off-by: Varad Gautam <varad.gautam@xxxxxxxx>
---
 x86/efi/crt0-efi-x86_64.S | 3 +++
 x86/efi/efistart64.S      | 8 ++++++++
 2 files changed, 11 insertions(+)

diff --git a/x86/efi/crt0-efi-x86_64.S b/x86/efi/crt0-efi-x86_64.S
index eaf1656..1708ed5 100644
--- a/x86/efi/crt0-efi-x86_64.S
+++ b/x86/efi/crt0-efi-x86_64.S
@@ -58,6 +58,9 @@ _start:
 	popq %rdi
 	popq %rsi
 
+	/* Switch away from EFI stack. */
+	lea stacktop(%rip), %rsp
+
 	call efi_main
 	addq $8, %rsp
 
diff --git a/x86/efi/efistart64.S b/x86/efi/efistart64.S
index 8eadca5..cb08230 100644
--- a/x86/efi/efistart64.S
+++ b/x86/efi/efistart64.S
@@ -6,6 +6,14 @@
 
 .data
 
+max_cpus = MAX_TEST_CPUS
+
+/* Reserve stack in .data */
+	. = . + 4096 * max_cpus
+	.align 16
+.globl stacktop
+stacktop:
+
 .align PAGE_SIZE
 .globl ptl2
 ptl2:
-- 
2.32.0




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