Re: [edk2-devel] [PATCH v2] OvmfPkg/MemEncryptSevLib: Fix address overflow during PVALIDATE

["Laszlo Ersek" <lersek@redhat.com>]

On 11/16/23 10:01, Gerd Hoffmann wrote:
> On Wed, Nov 15, 2023 at 11:51:53AM -0600, Michael Roth wrote:
>> The struct used for GHCB-based page-state change requests uses a 40-bit
>> bit-field for the GFN, which is shifted by PAGE_SHIFT to generate a
>> 64-bit address. However, anything beyond 40-bits simply gets shifted off
>> when doing this, which will cause issues when dealing with 1TB+
>> addresses. Fix this by casting the 40-bit GFN values to 64-bit ones
>> prior to shifting it by PAGE_SHIFT.
>>
>> Fixes: ade62c18f474 ("OvmfPkg/MemEncryptSevLib: add support to validate system RAM")
>> Signed-off-by: Michael Roth <michael.roth@amd.com>
> 
> Reviewed-by: Gerd Hoffmann <kraxel@redhat.com>

Merged as commit e8c23d1e27f70dcb2e59010ded6df32374eaa84a, via
<https://github.com/tianocore/edk2/pull/5125>.

Laszlo



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