diff mbox series

[RFC,v2,07/10] x86/hvm: Don't count XSS bits in XSAVE size

Message ID 20250102084413.102-8-ngoc-tu.dinh@vates.tech (mailing list archive)
State New
Headers show
Series Virtualize architectural LBRs | expand

Commit Message

Tu Dinh Jan. 2, 2025, 8:45 a.m. UTC 
HVM vCPU state images are uncompressed and therefore can't contain XSS
states.

Signed-off-by: Tu Dinh <ngoc-tu.dinh@vates.tech>
---
 xen/arch/x86/hvm/hvm.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
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Patch

diff --git a/xen/arch/x86/hvm/hvm.c b/xen/arch/x86/hvm/hvm.c
index 922c9b3af6..c7b93c7d91 100644
--- a/xen/arch/x86/hvm/hvm.c
+++ b/xen/arch/x86/hvm/hvm.c
@@ -1208,7 +1208,8 @@  HVM_REGISTER_SAVE_RESTORE(CPU, hvm_save_cpu_ctxt, NULL, hvm_load_cpu_ctxt, 1,
 
 #define HVM_CPU_XSAVE_SIZE(xcr0) (offsetof(struct hvm_hw_cpu_xsave, \
                                            save_area) + \
-                                  xstate_uncompressed_size(xcr0))
+                                  xstate_uncompressed_size(xcr0 & \
+                                                           ~X86_XSS_STATES))
 
 static int cf_check hvm_save_cpu_xsave_states(
     struct vcpu *v, hvm_domain_context_t *h)