From: Aaron Lewis <aaronlewis@google.com>
Date: Mon, 21 Oct 2019 23:30:27 +0000 (-0700)
Subject: kvm: svm: Update svm_xsaves_supported
X-Git-Tag: v5.5-rc1~182^2~58
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=52297436199dde85be557ee6bc779f5b96082f74;p=thirdparty%2Fkernel%2Flinux.git

kvm: svm: Update svm_xsaves_supported

AMD CPUs now support XSAVES in a limited fashion (they require IA32_XSS
to be zero).

AMD has no equivalent of Intel's "Enable XSAVES/XRSTORS" VM-execution
control. Instead, XSAVES is always available to the guest when supported
on the host.

Reviewed-by: Jim Mattson <jmattson@google.com>
Signed-off-by: Aaron Lewis <aaronlewis@google.com>
Change-Id: I40dc2c682eb0d38c2208d95d5eb7bbb6c47f6317
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 77429fa387482..4153ca8cddb75 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -5973,7 +5973,7 @@ static bool svm_mpx_supported(void)
 
 static bool svm_xsaves_supported(void)
 {
-	return false;
+	return boot_cpu_has(X86_FEATURE_XSAVES);
 }
 
 static bool svm_umip_emulated(void)